C. T. Brues.
Observations on Wood-boring Insects, their Parasites and other Associated Insects.
Psyche 34:73-90, 1927.

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19271 Observations on Wood-boring Insects 73 OBSERVATIONS ON WOOD-BORING INSECTS, THEIR PARASITES AND OTHER ASSOCIATED
INSECTS.1
During the course of many years' interest in the several groups of Parasitic Hymenoptera the writer has frequently been struck by .the preponderance of primitive types which prey up& wood-boring insects. Not only this, but several of the most primitive families of phytophagous Hymenoptera develop mainly within the tissues of woody plants and an exceptionally large proportion of the leaf-feeding sawflies subsist upon the foliage of trees. These facts suggest that the early phylogenetic history of the Hymenoptera was in some way bound up in the deveopment of the woody flora and that this early association has persisted to the present time without sufficient change to destroy the earmarks of past history in the modern hymenop- terous fauna.
The immediate occasion for the present discussion is a small, but quite varied collection of insects made during the past summer at my summer home in Petersham, Mass. Early in the season the attention of my wife was attracted by a con- siderable number of flying insects that had congregated upon the panes of a window in a room where the stove wood for the household is stored. This room contains an assortment of wood of various sizes and varieties, principally oak, chestnut, white <me, red maple and birch. The wood is cut in the nearby wood- lot one year, allowed to season and then sawed, split and stored away the next year. Before storage, it has therefore an oppor- tunity to be attacked by various wood boring insects and fungi together with the insects that are attracted to the latter. So many specimens appeared on the first day that collec- tions were made daily upon the window from early July to late September and by the end of the season we had amassed a con- siderable collection. After sorting and identification, the fol- Contribution from the Entomological Laboratory of the Bussey Insti- tution, Harvard University, No. 275.)
Pu&e 34:73-90 (1927). hup Ytpsychu einclub orgt14/%073 html



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'74 Psyche [April
lowing list was compiled which includes practically all of the species taken.
Nearly all of the members of this order have been identified by one of my students, Mr. P. J. Darlington, Jr. Family Rhipiphoridce
Pelecotoma flavipes Melsh. Twenty-one specmens of both sexes of this rare species, July 13-28. This has been reported emerging from beech wood, but the present specimens came from that of some other tree, probably red maple. The habits of the larvae appear to be unknown, although the genus is undoubtedly parasitic.
Family Pyrochroidce
Dendroides bicolor Newm. Three males July 13 and 18. This species breeds commonly in various deciduous trees such as oak, maple, beech and birch
Dendroides concolor Newm. One female July 13. This species is known to feed upon the same trees as the foregoing. Family Elateridce
Melanotus trapezoideus Lec. One specimen, July 20. Melanotus pertinax Say. One specimen, July 13. Members of this genus are commonly taken beneath the bark of various trees.
Family Melasidce (Eucnemidce)
Isorhipis ruficornis Say. 245 specimens representing both sexes in the proportion of 127 males to 118 females. This species
was the most abundant insect in the present collection. It was
taken first on July 13 and was still appearing when the last col- lections were made late in September although present in greatest numbers late in July. The species has been found in beech and soft maple and most if not all of the present series emerged from red maple.




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19271 Observations on Wood-boring Insects 76 Family Buprestidce
Dicerca lurida Fabr. One specimen, July 13. This species breeds commonly in hickory, although the present one came probably from an oak log.
Chrysobothris femorata Oliv. One specimen, July 13. This is a common enemy of apple, but the larvae occur in several other deciduous trees.
Family Dascyllidce
Eucinetus rnorio Lee. One specimen, July 20. This has been taken beneath oak-bark and on fungi on oak. Family Dermestidce
~ttagenus~iceus Oliv. Two specimens, July 26-28. This is the well known "carpet beetle" which develops in woolen mat- erials, feathers and other articles of animal origin. Weiss and West (Proc. Biol. Soc. Washington, vol. 33, p. 6 1920) record it from a fungus Lenzites betulinus so that its occurrence in the present series is probably not accidental. In country houses the larvae find food in the many flies and other insects that enter the walls, window casings, etc. for hibernation, many of them to die before the advent of spring.
Family Ostomatidce (Trogositidce)
Thymalus marginicollis Chev. Two specimens, July 20. This species breeds in the common shelf-fungus of birch, Poly- porus betulinus. .
Family Nitidulidce
Epurcea sp. One specimen. The members of this genus feed on fungi.
Family Myceto phagidoe
Mycetophagus flexuosus Say. One specimen, August 23. A common fungus-beetle.




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76 Psyche [April
Family Endornychidae
Endomychus biguttatus Say. One specimen, August 23. This is another fungus-beetle.
Family Tenehrionidce
Diaperis rnaculata Oliv. One specimen of this abundant species which occurs in fungi, especially in the shelf-fungus of birch.
Upis ceramboides Linn. One specimen, August 8. This is a northern beetle with circumpolar distribution; it occurs under the bark of logs of various kinds.
Family Melandryidoe
Synchroa punctata Newm. Six specimens, July 13 to 20. This species occurs under the bark of various trees, particularly pine and maple.
Family Anobiidce
Hadrobregmus carinatus Say. Eleven specimens, July 13- 17.
This species breeds commonly in maple logs and more rarely in those of other trees, such as beech. Ptilinus ruficornis Say. 18 specimens, July 13-20. This small beetle has been bred from dead branches and logs of various deciduous trees.
Family Cerambycidce.
Thirteen species of this large family were collected. Prac- tically without exception all members of the group are wood- borers.
Hypermallus villosus Fabr. One specimen, July 19. This is the common "twig-pruner" of oak which occurs occasionally in maple also.
Brachyleptura rubrica Say. One specimen, July 20. The host tree of this tree has apparently never been recorded. It probably occurs in oak.




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19271 Observations on Wood-boring Insects 77 Brachyleptura canadensis Fabr.
One specimen, August 8.
The larva develops in the wood of several conifers. Phymatodes testaceus Linn. One specimen, July 13. The larvae occur in oak and are commonly bred from cord-wood. Xylotrechus colonus Fabr.
Seven specimens, July 13 to
September 26.
This is a common species, usually bred from oak but found less abundhntly in logs of other deciduous trees. Xylotrechus undulatus fuscus Kirby. One specimen, August 18. This occurs in the wood of conifers. Neoclytus acuminatus Fabr.
Eight specimens, July 17 to
September 26. This is an abundant species which develops in a great variety of deciduous trees.
Anihoboscus ruricola Oliv. Five specimens, July 13-18. This is known to feed in hickory and elm; these specimens may have come from the latter.
Monochamus scutellatus Say. One specimen, July 19. This is an abundant species in New England feeding in white pine logs which are soon ruined if allowed to remain unsawed during the warmer part of the year.
Microgoes oculatus Lee. One specimen, July 19. The larva bores in oak and hickory.
Lepturges querci Fitch. One specimen, July 20. This small form develops in the wood of oak, hickory and other trees. Hyperplatys maculata Hald. Three specimens, July 14 to 20. The larvae develop in oak and the wood of other deciduous trees.
Urugraphis fasciata. Two specimens, July 19. The larvae of this species feed commonly in the bark of oak, but occur also in that of other deciduous trees and even in pine. Family Plat ystomatidce
Euparius marmoreus Oliv. Two specimens, August 23 and September 26. This is a fungus-beetle.
Choragus zirnmermanni Lec. One specimen, July 28. This is a wood-boring species that has been bred from sweet-gum, but which must have other hosts.




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Psyche
Family Psocidce
The four species listed below were examined and named for me by Mr. Nathan Banks.
Psocus leidyi Aaron, two specimens.
Psocus variabdis Aaron, two specimens.
Myopsocus sparsus Hagen, seven specimens. Peripsocus permadidus Walsh, one specimen. The members of this interesting group are said to feed mainly upon lichens and fungi and many species are conse- quently associated with trees and old wood. Two species were taken which have been very kindly identified by Dr. J. D. Hood.
Family Phlceothripidce
Hoplothrips karnyi major Hood, two females, July 20 and 26. Trichothrips sp. One male, July 20. This is probably an undescribed species known to Dr. Hood from Illinois also. Family, Xiphydriidce
Xiphydria maculata Say. 147 specimens of both sexes, July 13 to September 26. The great majority of the specimens emerged during the third week in July. The females are ex- tremely variable in size ranging from 8 to 20 mm. in length while the males range from 7-12 mm. This species is known to breed in maple and most if not all the individuals in the present series emerged from red maple logs.
Species of Xiphydria are commonly parasitized by mem- bers of the Aulacid genus Pammegischia of which two species were obtained as noted on another page, without question from this wood-wasp.




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19271 Observations on Wood-boring Insects 79 Family Aulac<dce
Pamrnegischia pallipes Cresson. Four females and a male, July 13 and 17. The abdomen of two females is black, except the first and second segments; and the others agree with the description given by Bradley ('08) of P. xiphydrice Ashm. The male t.aken with them is typical of P. pallipes and Bradley is un- doubtedly right in regarding these two as sexes of the same species. P. xiph ydrice has been bred from Xiph ydria provancheri living in birch twigs according to Viereck and Champlain reared P. burquei Prov. from another species of Xiphydria. Pristaulacus stigmaterus Say. Two females and one male, July 13 and 16.
Gusteruption tarsatorium Say. Two females, July 13 and 17. Gasteruption incertum Cresson. Two females and two males, July 13 and 17.
Family Braconidce
Spathius simillimus Ashmead. One female, July 17. This species has been bred from the small Buprestid beetle, Agrilus bilineatus, a well known enemy of chestnut and oak. The mem- bers of the genus are parasites of small wood-boring beetles, principally bark-beetles of the family Ipidse. Helcon ligator Say. Three females and one male, July 13 and 19. This has been bred from several Cerambycidse, in- cluding Neoclytus acurninatus Fabr. which is abundant in the present collection.
Blacus longicaudis Prov. Five specimens of both sexes, July 18-September 5.
Ascogaster carpocapsce Viereck. One male, July 13. This species, described by Viereck as a Chelonus was bred from the codling moth Cydia (Carpocapsa) pomonella and has since been reared by Wilcox (Psyche, vol. 25, p. 17, 1918) from the Oriental moth (Cnidocarnpa f lavescens) . Apanteles consirnilis Viereck.
Seventeen females and two
males, July 14-Aug. 23. According to Muesebeck this is not a common species, or at least has been only rarely taken.



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Psyche
Family Ichneumonidce
Rhyssa canadensis Provancher. Three females, September 27. As members of this genus are known to parasitize Xiphydria, these probably came from the abundant X. maculata. Arotes amoenus Cresson. Two females, July 13. Species of Arotes are parasites of cerambycid beetles. Lissonota insita Cresson. Nine specimens .of both sexes, July 13-August 22.
Polysphincta texana Cresson. This is a widely distributed parasite of spiders that has been bred by Cushman from the common Steatoda borealis.
Family Vanhorniidce
Vanhornia eucnemidarum Crawford. Thirteen females and seven males, July 13-September 26, all but one taken during July.
This most remarkable insect was made the type of a new family by Crawford in 1909 when he first described it. The types were bred by Van Horn from larval cells of an unidentified Mela- sid (Eucnemid) beetle and the species has since been recorded by Champlain (Psyche, vol. 29, p. 100, 1923) as a parasite of Isorhipis flavicornis.
The present series are undoubtedly from . the same host, which is abundantly represented in the collection at hand.
Crawford makes no reference to the systematic relation- , ships of Vanhornia except to note that the wing-venation re- sembles that of Helorus. On account of its exodont mandibles one would naturally compare it with the family Alysidse and the somewhat dubious insect, Lysiognatha, placed by Ashmead as an Alysiid. It is very evident, however, from the other characters that Vanhornia has no affinities with any Alysiid. The antennae are not multiarticulate and the wing is provided with a costal cell, both of which are fundamental differences. Also the struc- ture of the abdomen which is heavily chitinized below, and forms a carapace above is entirely dissimilar to that of any Alyslid although in one genus, Symphya of the latter family the tergites



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19271 Observations on Wood-boring Insects 81 are fused. This similarity is however purely superficial. Con- sidering the wide divergence between the two groups we must conclude that the reversed mandibles are of independent origin and that this peculiarity has developed more than once in the order Hymenopt era.
The similarity in venation between Vanhornia and Helorus is very great and in fact there is no difference except that Helorus has lost the upper section of the basal vein which is still present though weak in Vanhornia. Ashmead speaks of the basal vein as bent down to form a discoidal cell in Helorus but this vein is a combination of the lower section of the basal and the first section of the cubitus which form together an arc as is readily seen by comparison with Vanhornia or Ropronia. Ropronia was placed by Ashmead as a part of the family Heloridae and I think correctly so although Bradley has disputed this. Ropronia again agrees closely with both Helorus and Vanhornia in venation. Aside from the peculiarities of the head associated with the greatly enlarged mandibles, the complete reduction of the ab- dominal petiole and the greatly developed ovipositor, Vanhornia is clearly similar to Helorus and the Jurassic genus Mesohelorus and the two families must be placed near together in the group Serphoidea. Handlirsch following Viereck has placed Vanhornia next to the Alysiidae and the strange genus Gnathobracon. This position appears to be clearly untenable as noted above. Family Chr ysididce
Chrysis verticalis Patton. One female, September 26. Omalus iridescens Norton.
Four specimens, July 17-26.
Species of Omalus are parasitic upon wasps that nest in wood 0. corruscans has been bred from Stigmus arnericanus which is probably the host of the present specimens. Family Eurnenidc~
Odynerus cristatus Saussure.
Nine specimens, July 18-28.
This is a common species nesting in burrows in wood.



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Psyche
[April
Family Crabronidce
Solenius (Crabro) interruptus Lepeletier. One specimen, July 17. Nests in wood.
Blepharipus nigricornis Provancher. Five specimens, doubt- fully of this species, July 17-September 26. This nests in wood also.
Famil y Try pox ylonidce
Trypoxylon frigidum Smith. One specimen, July 18. Nests in wood.
Family Pemphredonidce
Pemphredon tenax Fox. Two specimens, probably this species, July 26.
Pemphredon angularis Fox.
One specimen, September 26.
Stigmus americanus Packard. Two specimens, September 26. Passaloecus annulatus Say. Four specimens, July 20-26. This and the preceding three species all build their nests in wood. Family Hylceidce
Hylceus (Prosopis) modestus Say. Two specimens, July 18- August 8.
Family Megachilida
Megachile relativa Cresson. One specimen July 17. This and the preceding bee nest. in wood.
Sixteen species were collected, distributed in a number of families. My friend, Professor A. L. Melander, has been so good as to identify all of these except t-he Phoridse. Family It onididce
One specimen, July 16.
Not in good enough condition for
more accurate determination, but probably a xylophagous form.



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19271
0 bservations on Wood-boring Insects
Family Mycetophilidcz
Sciara sp. One specimenl July 17. Some species of this .
genus are mycetophago~s~ developing in fleshy fungi. Family Chironornidm
Culicoides sp. One specimen, July 16. Accidental; this is a phlebotomic type with aquatic larva.
Family Scato psid~
Reichertella fernoralis Meigen. One specimen, July 17. Family Scenopinida
Scenopinus jenestralis Linne. Three specimens, July 20-28, September 26.
This is the common "window-fly" frequently seen in houses.
The larva is carnivorous and has been reared from the preparatory stages of the c10t)hes-mot' Family Phorid~
Aphiochmta pulicaria Fallen. Eight specimens of both sexes, Jdy 14-August 23.
Aphiochata agarici Lintner. One female) July 17. The 1arvt-e live in various fleshy fungi.
Aphiochmta sp. One female, July 28. This is probably an undescribed species with swollen, heavily chitinized proboscis. A phioch~ta sp. Eight specimens, July 18-August 23. Sim- ilar to A. iroquoiana Malloch, but probably an undescribed species.
Family Muscid~
Muscina stabulans Linn. Two specimens, August 8. The larvte of thk fly are predatory upon other dipterous larv~. Family Trypetidm
Pseudotephritis vau Say. Two specimens) July 23 and Aug~t 23. The larvz occur beneath bark.




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84 Psyche [April
Family 'Oscinidcz
Oscinis nitidissima Meigen. One specimen, July 17. The larva of Oscinis develop in the stalks and roots of various plants, particularly grasses.
Family Drosophilidiz
Drosophilu quinaria, Loew.
Two specimens, July 20 and
August 22.
The larv~ have been found in fruit,, but, the species may also develop in fungi.
Drospohila aflinis Sturtevant, One specimen, July 26. Sturtevant has bred this species from fruit and has found the adults attracted to exuding sap.
Drosophila sp. One specimen, July 26.
Family Mirid@
The two species were kindy identified
by Professor H. Ha
Knight.
Plagiognathus politus Uhler. One specimen) July 18. This leaf-bug feeds on various plants, including apple foliage. Pilophorus uhleri Knight. One specimen, July 28. Family Anthocorid~
X y locoris cursitans Fall.
One specimen, kindly identified
by Professor H. M. Parshley.
Reduvius personatus Linn. One specimen, July 14. This is a predatory species) often found beneath loose bark where it feeds upon other insects.
HOMOPTERA
Melanoxantherium medium Baker. A few specimens of aphids were seen and one taken on July 16th proves to belong to this species which occurs on poplar.




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19271 Observations on Wood-boriny Imects 85 The size of the present collection is of course very small but it allows one to draw several conclusions relating to the composition of fhe insect fauna that is associated with the wood of dead trees; conclusions, it may be added, which are sub-