24 Jouiniil of F^ntomology and Zoology 



Thorax shining black, the dorsum with short, sparse white 

 pile; scutellum shining black, with short white pile. Humeral 

 callosities and lower half of pleura gray pollinose. Stem and under 

 part of knob of halteres blackish, the most of knob white. 



Abdomen shining black, finely punctate and with short, sparse 

 whitish pile; hind margins of visible segments one to four narrowly 

 yellowish white, broader on the first. Abdominal pile appears 

 white in certain lights but is largely dark colored. Sternite of 

 seventh segment projects downward in a noticeable triangle as seen 

 in profile. Pile around genitalia rather dense and whitish. Ven- 

 ter black, the hind margins of first five segments yellowish white. 

 Legs wholly black, the pile fine and short. Wings hyaline, rather 

 broad and rounded, the veins black and strong; R2+3 curved 

 slightly forward at tip (see fig. 3). 



Holotypc, a female, collected at Huntington Lake, Fresno 

 County, California, 7000 feet, July 15, 1919 (E. P. Van Duzee), in 

 the collection of the California Academy of Sciences. 



Paratypes. — Two females, taken in the type locality, July 8, 

 1919, by Mr. E. P. Van Duzee. 



This species is evidently near M. exilis Coquillett, but differs 

 in the color of the legs and in the wing venation. The only other 

 species in the genus is mancipennis Coquillett an eastern form, 

 which has the face and the stems of the halteres white. 



Acreotrichiis maculipeymis new species. 



A velvety brown species with thickly spotted wings ; the pro- 

 boscis slightly longer than the head. 



Male. Length 4.25 mm. Head black, brownish pollinose, the 

 face and vertex with rather long and erect black pile. Occiput 

 rather flat; occiput and cheeks with black pile. Oral opening 

 large, the antennae placed on the upper edge (see fig. 2) ; first and 

 second anetnnal joints rather slender, the first slightly longer than 

 the second, the third slightly longer than the first two combined 

 and considerably widened near the middle, the style short and 

 subapical (see fig. 2) ; pile on upper side of all antennal joints 

 l)lack. Proboscis black, projecting twice the length of the antennae 

 beyond the oral margin. Palpi black, very slender, with black 

 pile, projecting beyond oral margin about one-third as far as 

 proboscis. 



Thorax black; mesonotum velvety black, shading to a sepia 

 l)rown on the margins; the pile of dorsum erect and yellowish, 

 appearing brown in certain lights. Scutellum velvety black, with 

 comparatively long, coarse yellowish pile. There are indications of 

 two median black vittae on the anterior part of the mesonotum, 

 separated by a fine brown line. Pleura brown pollinose, the sparse 



