1914] Johannsen—Sciara tongregata 93 
SCIARA CONGREGATA SP. NOV. (DIPTERA). 
By O. A. JOHANNSEN, 
Cornell University, Ithaca, New York. 
The following description is based on specimens reared at Fay- 
etteville, Arkansas, by Mr. George G. Becker, whose account of 
the habits of this insect appears in the present number of PsycuHeE. 
Sciara congregata sp. nov. 
Male: Length 2 mm. Head black, palpi and antenne fuscous, the antenn 
rather short, about two thirds as long as the wing (measured from humeral cross 
vein), the intermediate joints not twice as long as wide. Mesonotum subshining 
blackish; scutellum, metanotum, and pleura subopaque, brownish black. Abdo- 
men and hypopygium subopaque brownish black, the latter stout, with claspers 
resembling those of Sciara jucunda, though the apical sete are rather stouter. Coxze 
and legs brownish, the tarsi dark brown; legs relatively short and stout, hind tibia 
about as long as the petiole of the media of the wing; apical third of tibiz slightly 
broadened; hind tarsus about 0.8 as long as the tibia, hind metatarsus slightly 
over 0.7 as long as the following four joints. Wings smoky hyaline, veins dark 
brown, the radius, the forks of the media and the apical part of the forks of the 
cubitus beset with sete. Ry; ends two thirds as far proximad of the fork of the 
media as the tip of Rg is distad of this point; basal section of Rs very faint and 
indistinct, though the basal section of R is evidently noticeably longer than R,; 
costa produced nearly 0.6 of the distance from the tip of Rs to M;; Rs ends slightly 
proximad of M.; petiole of media very inconspicuous; cubitus forks distad of the 
base of the petiole of the media. Halteres dark. 
Female: Length 2.5 mm. Like the male in coloring and structure differing in 
having slightly shorter antenne, these being less than half as long as the wing, with 
intermediate joints but little longer than wide; the basal section of Rs and the petiole 
of the media a little more distinct. The lamells of the ovipositor are only slightly 
jonger than wide. 
Type in my collection; paratypes in the collection of the Arkan- 
sas Agricultural Experiment Station. This species will find a 
place in the key given on page 118, Fungus Gnats of North America 
(Bull. Maine Agr. Exp. Station, No. 200), between S. vicina and S. 
dives, differing from both in coloring, venation, and structure of 
hypopygium. 
