F. R. COLE 53 



A male and female of this species were in a small collection 

 loaned by Professor Doane from the Stanford University col- 

 lection. Both are from Lake Tahoe, California. The venter in 

 the female is almost all black with narrow pale margins to the 

 segments. In the male the ventral segments are black basally 

 and broadly black on the lateral margins. The legs are honey 

 yellow; claws and most of last tarsal joint black. Wings whitish 

 hyaline with pale veins which have an obsolete appearance. 

 There is no second longitudinal vein. Length, 5 mm. 



A male from Pullman, Washington (A. L. Melander), was col- 

 lected July 5, 1907. The scutellum is jet black. The abdom- 

 inal markings are as in the Lake Tahoe specimen. A female 

 specimen from Denver, Colorado, July 12, 1903 (Van Duzee), 

 has the dorsal black triangles on the abdomen joined to the 

 lateral spots, so that there are complete cross-bands. 

 Acrocera convexa new species (PI. X, fig. 29.) 



6 . Nearly answers the description of A. obsoleta v. d. W. Head and 

 thorax black; the pleura black. Scutellum, mostly yellow, black at base and 

 sides. Humeral callosities yellowish. Abdomen very large and orange-yellow 

 in color. Base of second abdominal segment with black triangle, a shorter 

 triangle on third, and an irregular black spot at base of fourth. Fifth segment 

 and genitalia all yellow. Wings very short, the veins pale, but the anterior 

 cross-vein and upper branch of third clearly present. No second longitudinal. 

 Praescutellar callosities white except blackish base. Venter yellow, the sides 

 black, the black narrowing toward apex of abdomen. Legs yellow, last half 

 of last tarsal joint black. Body with short whitish hair. Length, 5.5 mm. 



Female. Markings much as in the male. The abdomen in this specimen 

 much retracted. Abdomen orange color; first segment and base of second black. 

 A large black basal triangle on third segment. Venter black with few markings. 

 Wings much longer than in male; the venation the same. 



r^/pe.— Holotype, a male, in U. S. N. M., no. 21206. Siski- 

 you County, California, (Coquillett). 



Allotype in Museum of Comp. Zoology at Cambridge. Spo- 

 kane, Washington, July 22, 1882, (Henshaw). 



Acrocera unguiculata (PI. XIII, fig. .37.) 



Acrocera iinguiculala Westwood, Trans. Ent. Soc. London, v, p. 98, (1848.) 



Head and thorax black. Abdominal spots rather irregular. Postalar and 

 humeral callosities black. The second segment black with a small yellow spot 

 near the posterior margin. Large irregular spot on margin of third segment not 

 reaching the lateral margins. 



TRANS. AM. ENT. SOC, XLV. 



