94 D. W. COQUILLETT. 



two and a half times as long as wide. Wings having the anterior 

 branch of the third vein connected with the second by a cross-vein, 

 forming three submarginal cells ; four posterior cells, all of them 

 open, as is also the anal ; furcation of the second and third veins 

 occurs slightly before the small cross-vein, the distance equaling two- 

 thirds the length of that cross-vein ; first basal cell slightly longer 

 than the second ; marginal cell not greatly expanded at the apex. 

 Tibiae bristly, pulvilli large, empodium bristle-like. 



Dedicated to Mr. J. M. Aldrich, who had recently taken up the 

 study of our Diptera, and to whose kindness I am indebted for a 

 specimen of this very interesting insect. 



Aldricliia elirinaiiii n. sp. — Wholly black, opaque, except the shining 

 scutellnm. Pile of upper part of front, face, autenufe, mouth parts and lower 

 half of occiput, black, that on lower part of front and upper half of occiput 

 largely white. Short pubescence of thorax and scutellum yellow, the longer pile 

 and bristles black ; pile of pleura white. Short pubescence of abdomen yellow, 

 pile on middle of dorsum and on last segment black, that on sides of abdomen 

 white. Wings blackish, darkest in costal, marginal and first basal cells, anal 

 and axillary cells nearly hyaline. Length 9 mm. 



Pennsylvania (Ehrman). Mr. Aldrich writes me that he has a 

 second specimen which is identical with the one described above. 



SPOGOSTYLUM Macq. 



Spogostyllini vandylcei u. sp.— Black, the tibise brown, knob of hal- 

 teres largely yellow. Pile of front in the female black, of face mixed yellow 

 and black, in the male wholly yellow, that of the body in both sexes abundant, 

 yellow; many on dorsum of abdomen black; scales of front, face, occiput and 

 femora, yellowish white. Thorax and scutellum destitute of scales. Abdomen 

 with a few black ones posteriorly ; third antennal joint suddenly contracted into 

 a slender style, whicli is scarcely longer than the thickened basal part; terminal 

 style scarcely longer than broad ; face much retreating below, proboscis not pro- 

 jecting; bristles of legs black, occurring on all femora and tibiae, pulvilli very 

 large. Wings in the female hyaline, costal cell and base of wing to discal cell 

 yellowish, palest in apices of anal and axillary cells, a dark brown cloud at bases 

 of first submarginal, first and fourth posterior cells; in the male, only the costal 

 cell is yellow, a brown cloud at bases of first submarginal, first and fourth pos- 

 terior, and of the discal cell ; a stump of a vein near base of second vein and an- 

 terior branch of the third ; the latter connected with the third by an oblique 

 cross-vein. Length 10-12 mm. 



California. One male and two females. The first specimen was 

 collected in Mariposa County, in July, by Dr. E. C. Van Dyke, of 

 this city, to whom it gives me pleasure to dedicate this interesting 

 species ; in April of the following year I was fortunate enough to 

 capture a pair of specimens in one of the caiions on the border of 



