Article beginning on page 310.
Psyche 4:310, 1883.

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nomyia have only been found in the
be relied upon for an inference, since
throats of cervina, those of the genera
Oestrus &#orinus belongs to the group
Cef/talamyk and Oestrus only in tyio-
of oestridae with naked bristle, but its foda and cavicornia, those of the larva lives upon a rodent. It is seen genus Gastruphilus in soIidungula that such divisions are only artificial and multungula (Rhinocervs} , but and serve for orientation, but that ffyfoderma, on the other hand, in nevertheless nature cannot be forced caviwrnia (Bus, Cajra, Antilope), into them. Such divisions are there- cervina ( Cervus, MoscJius), and fore only temporary, and only too equidz, ~U/ere$ra larvae in rodentia
often become witrue so soon as new
and -fnars@iala, and finally those of
discoveries are published.
It is there-
Dermatobia in (logs, oxen, horses, and
fore best to treat of the larvae accord- -
even upon man.
[p. 4.01 Another picture is formed
if the perfect insects are divided accorcl- ing to a peculiar character into those
with pectinate antennal bristles (C-uie- reira, Dematohta), and those with
naked antennal bristles (Hyfoderitta,
Gustro$hilus, Cefkenomyh, Ce-pkato-
myz'a), since the larvae of the former
are parasitic in ungulate animals as well as especially in rodentia and mar=-
å´piaUo, but those of the latter only in wngulata. This hitherto so convenient
and practical division likewise cannot
ing to their genera, and to limit these
as naturally as possible, since it has
thus far been found constantly in this
family that the larvae of one genus all
have a like life-history, and conversely the generic characters of the imagines
can scarcely lead us astray if we wish
to draw an inference as to the life-
history of a larva perhaps not yet inves- tigated. In the case of a new genus,
however, we can infer its life-history
with very little certainty. Experience
alone teaches this.
WAXY SECRETIONS OF PSYLUB LARVAE. off repeatedly on account of itgown weight and Dr. FranxUw, in his tkBeitrSge zur kenntniss consequently reaches no very considerable der jugendstadien der psylliden" (Verhandl. length. Furthermore this larva secretes from K.-k.zool.-bot gesetls., 1884, v. 34; Abh.), p. the wax-glands on the dorsal surface of the 144, thus describes a curious secretion in the last abdominal segment extremely fine white larvae of PsyIZu dmi: "From wax-glands threads, which form unitedly a very loose, surrounding the anus the larva emits a white light flock." The larvae of Triasa, three spe- secretion, which a'ppeai-B as a hollow, venni- cies of which larvae are described in the same form thread that allows the pwsage through paper, have their entire outer margin sur- it of the fluid excrement of the larva. This rounded by hyaline, silky, very fine, threads white thread, which reveals the presence ofthe of wax, which lie close to one another, and larvae hidden in the axils of the leaves behind seem to form a short, closely-trimmed fringe the stipules, elongates continously, but breaks around them.



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