NORTH AMERICAN DIPTERA. 181 



the middle above yellowisli. Thorax yellowish white tonientose, bristles white, 

 pile of front end, sides, pleura, breast and cox» whitish. Scutellum yelloM'ish 

 white tonientose, bristles white. Abdomen wholly yellowish white tomentose; 

 pile of dorsum very sparse, of the sides more abundant, white; venter white 

 tomentose and pilose. Legs white tomentose, front tibise destitute of bristles, 

 claws of front tarsi minute. Wings wholly hyaline, base of costa yellowish 

 white tomentose, the front edge beset with black bristles. Length 5 — 7 mm. 

 San Diego County, Cnl. Six specimens in May. 



56. A. iiiciilta n. sp. — Black. Front on upper half golden-yellow tomen- 

 tose, that on lower half largely white, pile on upper half black, that on lower 

 half whitish ; face slightly produced below, white tomentose, that on extreme 

 sides yellow. Proboscis projects half the length of the labellse beyond the oral 

 margin. Antenna; with first two joints subequal in length, black pilose, base 

 of third joint short-conical. Occiput white tomentose. Thorax light yellow 

 tomentose, and with a cross-band of white tomeutum near the front end, con- 

 tinued along each side above the wings, reaching the scutellum; pile of front 

 end and sides of thorax, on front half of pleura, on breast and middle and hind 

 coxffi light yellow, that on posterior half of pleura white, on front coxa; largely 

 black. Scutellum light yellow tomentose, that on the base white, the bristles 

 reddish. Abdomen light yellow tonientose, that on bases of second and third 

 segments white; pile of dorsum very sparse, black; that on sides of first two 

 segments abundant, yellowish white, on sides of remaining segments sparse and 

 mostly black; venter light yellow tomentose and pilose. Legs light yellow 

 tomentose, front tibise destitute of bristles, claws of front tarsi minute. Wings 

 hyaline, subcostal cell yellowish. Length 7 mm. 



San Bernardino County, Cal. A single specimen in July. 



57. A. terreiia. n. sp. — Black. Front and face pale yellow tomentose and 

 black pilose, face considerably produced below. Proboscis projecting half the 

 length of the labellse or less beyond the oral margin. Anteiniie with first two 

 joints of an equal length, black pilose, the third joint at its base short-conical. 

 Occiput yellowish white tomentose, that in the middle above dark yellow. 

 Thorax pale yellow tomentose, the bristles whitish, pile of front end yellowish 

 white, of pleura, breast and cosse white. Scutellum pure yellow tomentose, 

 bristles reddish. Abdomen mixed yellowish white, and dark yellow tomentose ; 

 pile of dorsum very sparse, black, on first segment and sides of second rather 

 abundant, white, on sides of the remaining segments sparse, black ; venter white 

 tonientose and pilose. Legs white tomentose; front tibise destitute of bristles, 

 claws of front tarsi minute. Wings hyaline, costal. and first basal cells yellowish. 

 Length 5 — 7 mm. 



Los Angeles and Kern Counties, Cal. Ten specimens in June. 



58. A. squaiuigera n. .sp. — Black. Front black pilose, destitute of tonun- 

 tum except on lower fourth, where it is sparse and white, a shallow fovea below 

 middle of front ; face much retreating below, white tomentose and pilose. Prolios- 

 cis not projecting. Antenna? with the first joint twice as long as the second, black 

 pilose, base of the third joint very short-conical, the styliform portion slender 

 and linear. Occiput white tomentose. Thorax brassy-yellow tomentose, bris- 

 tles black, pile of front end light yellow, of pleura, breast and coxse white. 



TRANS. AM. ENT. SOC. XIX. JULY, 18i)2. 



