Charles W. Johnson.
New North American Diptera.
Psyche 19:1-4, 1912.

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PSYCHE
VOL. XIX. FEBRUARY, 1912. NO. 1
NEW NORTH AMERICAN DIPTERA.
BY CHARLES W. JOHNSON,
Boston Society of Natural History, Boston, Mass. In the genus Cylindrotoma there is considerable variation in the venation of both species and individuals. The three speci-
mens of C. distinctissima Wiedemann received from Herr, M. P. Riedel show very little variation, the second posterior cell is of almost uniform length (Fig. 1). The figure shown by Prof. J. G. Needham of "C. distinctissirnu Meigen, after van der Wulp" (N. Y. State Museum, bull. 124, pi. 15, fig. 4, 1908) does not rep- resent the species. In C. americana 0. S. the two specimens before me from Capens, Moosehead Lake, Maine, July 11, 1907, have the second posterior cell the same length as the third (Fig. 2). Regarding the venation of C. splendens Doane (Fig. 5 after Doane) he says :-"Submarginal cell either longer or shorter than the first posterior cell. In two of my specimens it is longer in one wing and shorter in the other." In C. juncta Coq. the base of the sec- ond posterior cell is slightly before the base of the third. C. tar- salis sp. nov. (Fig. 4) has normally a venation similar to C. di .s t' znc- tissima, but there are many abnormalities. Among the fourteen specimens, four have the second posterior cell as long as the third in one or both wings; one has the vein MI obsolete with only a slight indication of the vein at the margin; another specimen has a very abnormal venation, in one wing a small cell is present at the base of the submarginal and first posterior cells, extending from the marginal cell to and partly over the base of the discal cell; the junction of vein MI is imperfect in both wings. In C.
anomala sp. n. (Fig. 3) the first posterior cell is petiolate and the anterior cross-vein extends to the petiole.



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19121 Johnson-North American Diptera 3
One specimen, Woodworth Lake, Bleecker, N. Y., August 19, 1909, collected by Charles P. Alexander.
This species is placed here provisionally awaiting more material. It seems
strange that two species taken at the same time and place should resemble each other so closely in color. The five posterior cells would indicate its place in this genus, but the antennae and genitalia are quite different from the typical Cylindrotoma.
Elliptera alexanderi sp. nov. (Figure 5.) Male. Rostrum and palpi black, antennae light yellow, the second and third joints globose, flagellum slender, verticils long, tip of the flagellum brown. Thorax yellow with three broad, brown stripes, the middle one obscurely divided before the suture; scutellum and metanotum brown, margined with yellow; pleurae yellow with three brown longitudinal stripes, the upper one somewhat obsolete, the lower one broader than the others and extending over the bases of the coxae. Abdomen brown, posterior margins of the segments and venter yellowish, genitalia large, yellow; tips of the appendages black. Legs yellow; the entire front femora, apex of the middle femora and a subapical band on the posterior femora dark brown; tibiaeand bases of the metatarsi whitish, bases and apices of the front and middle tibiae, tips of the posterior tibise and all of the tami including the outer half of the metatarsi dark brown. Halteres yellow the knobs slightly infuscated. Wings hya-
line with a slight brownish tinge, stigma brown with a light spot on each side, the costa and costal and subcostal cells white. Length, 4.5 mm. The female differs
but little from the male. The front and middle metatarsi are entirely brown: the ovipositor entirely yellow.
Six specimens, Sport Island, Sacandaga River, N. Y., July 5, 1909, and August 24, 1910. Holotype and two paratypes in the author's collection; the others in the collection of the collector, Mr. Charles P. Alexander. Leptis gracilis sp. nov.
Male. Front and occiput blackish, grayish pollinose, with two slight tubercles above the antennae; ocelligerous tubercle black; eyes widely separated; palpi and an- tennse yellow, aristae black. Thorax yellow, with narrow somewhat obsolete stripes due largely to rows of fine black hairs; pleurae and scutellum yellow. Abdo- men slender, yellow, first segment with a black spot below the scutellum, the re- maining segments with broad basal bands of black. Halteres and legs light yellow, a small black dot at the base of the femora on the inner side; tarsi somewhat brown- ish toward the tips. Wings hyaline, veins light brown, anal cell closed, with a short petiole extending to the margin. Length, 6 mm. The female differs but little from the male except that the black on the first segment of the abdomen extends entirely across the base. The front is slightly wider and has three slight grooves, the tubercles are obsolete. Six specimens Holotype and A1lotype.-Amsden, Vt., July 10, 1908 (C. W. John- son). Paratypes.-Mt. Ascutney, Vt., above 2,000 ft., July 11, 1908 (C. W. John- son.) Mt. Greylock, Mass., August 8, 1907 (Owen Bryant). Types in the New
England collection of the Boston Society of Natural History.



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4 Psyche [February
This interesting species is not a typical I~ptis, for the eyes of the male are dichop- tic.
In form it resembles Dialysis, but the front tibiae are without spurs and the hind tibiae have two as in typical Leptis. The anal cell is closed, but the open
anal cell is not a fixed character.
Among twenty-six specimens of L. mystacea seven have the anal cell closed, as shown in Williston's Manual, 1908, p. 157, fig. 51, although the table on page 163 says open. This character also varies in L.
plumbea (4 open and 3 closed) and L. punctzpennis (2 open and 8 closed), one speci- men has it open on one wing and closed on the other. A specimen of L, albicornis has the discal cells open.
Chrysopila davisi sp. nov.
Female. Head velvety black; antennae black. Thorax black, covered with a dense golden yellow tomentum, similar to C. thoracica pleurae, scutellum and the entire abdomen velvety black. Femora black, tibiee and metatarsi light yellow; the remainder of the tarsi blackish. Halteres black. Wings smoky black. Length, 15 mm.
a
Two specimens collected by Mr. William T. Davis, Clayton, Georgia, "2,000- 3,700 ft." June, 1900. Holotype in the author's collection. This species seems to
be intermediate between C. velutina, Lw. and C. thoracica Fabr., the wings and abdo- men are like the former and the thorax like the latter. Nemotelus bonnarius sp. nov.
Male. Face shining black, facial projection moderate, proboscis double the length of the head, bent slightly beyond the middle; a small spot above the base of the an- tennse; eyes sub-contiguous; antennae black; thorax and scutellum black, with a small white spot on the humeri. Abdomen mostly white, the first segment black except at the posterior angles; second white except for a short anterior, central margin of black; third white except a small black spot at the anterior angle; fourth black, except for a narrow lateral and posterior margin, which is often interrupted posteriorly leaving a dorsal spot, fifth black, with a narrow lateral and posterior margin dorsally expanded; venter black with a large irregular white spot on the second, often extending onto the third segment. Femora black, tips of the femora and the greater part of tibiee and tarsi white, middle of the posterior tibiae black and of the front and middle tibiae brown. Halteres white. Wings hyaline, veins light yellow, third vein furcate. Length, 5 mm. Female. Front very broad with a small white spot at the lower end of the frontal orbits, narrowly separated from an elongated spot on the facial orbits; proboscis short and thick, bent near the middle. Abdomen black, with a small, white, dorsal spot on the posterior margins of the second, third, fourth and fifth segments, the lateral margins are narrowly margined with white, which often extends for some distance around the posterior angles.
Ten males and eight females, Farewell Creek, South Saskatchewan, August, 1907, collected by Mrs. Varah A. Armstrong.
One male, Ramsey Co., Minn. Holotyve
and Allotype in the author's collection. Allied to N. kansensis Adams, but distinguished by the greater amount of black



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