NORTH AMERICAN DIPTERA. 183 



joint very elongate-conical. Occiput yellowish white tomentose. Thorax pale 

 yellow tomentose and black pilose, bristles black, pile of front end yellowish white 

 and black, pile of sides, pleura, breast and coxae wholly black. Scutelluiu mixed 

 pale yellow and white tomentose, bristles black. Abdomen black tomentose. 

 which in certain lights has a brassy tinge, that on bases of second and third seg- 

 ments whitish, on last two segments almost wholly pale yellow ; pile of dorsum 

 very sparse, black, that on first segment and front corner of second more abun- 

 dant, white, on sides of rest of abdomen sparse, black ; venter black, tomentose, 

 in certain lights appearing brassy. Legs with tomentum like that of the venter: 

 front tibise destitute of bristles, claws of front tarsi small. Wiugs hyaline, costal, 

 first and second basal cells slightly smoky. Length 6 mm. 



Los Angeles County, Cal. Two specimens in May. 



64. A. Tiilpiiia n. sp. — Black, face, first two antennal joints, sides of ab- 

 domen broadly, venter, femora and tibiae reddish. Front golden-yellow tomen- 

 tose and black pilose; face greatly produced below, golden-yellow tomentose, 

 mixed yellow and black pilose. Proboscis projecting the length of its labellse 

 or less beyond the oral margin. Antennae having the first joint nearly twice as 

 long as the second, base of third joint elongate-conical. Occiput bright yellow 

 tomentose. Thorax and scutellum golden-yellow tomentose, bristles reddish, 

 pile of front end and sides of thorax, of pleura, breast and coxse dark yellowish- 

 Abdomen wholly golden-yellow tomentose, pile of dorsum very sparse, of sides 

 more abundant, yellow ; venter golden-yellow tomentose and pilose. Legs gol- 

 den-yellow tomentose, front tibiae destitute of bristles, claws of front tarsi very 

 small. Wings hyaline at the apex, the base pale brown', the outline of this color 

 extending from first vein midway between the apex of auxiliary and base of 

 second vein, going to discal cell at its last third, then basally a very short dis- 

 tance, then running through the third and fourth posterior cells, reaching the 

 penultimate vein near middle of fourth posterior cell ; whole of axillary cell 

 hyaline, anal and second basal cells very pale smoky, darkest ueai- their apices, 

 base of discal cell brown to beyond the small cross vein. Length 9 mm. 



San Bernardino County, Cal. Two specimens in July. 



65. A. crociiia n. sp. — Black, abdomen, except the first and last segments, 

 orange-yellow. Front pale or golden-yellow tomentose above, that next the 

 antennffi white, its pile mixed white, yellow and black: face slightly produced 

 below, white tomentose. Proboscis not projecting. Antenna? having the first 

 joint one-half longer than the second, ba.se of third short-conical, the styliform 

 portion graduallj' tapering to the tip. Occiput white tomentose, that in the 

 middle above golden-yellow. Thorax deep golden-yellow tomentose, in certain 

 lights with a coppery tinge ; pile of front end and sides white, bristles black and 

 yellow; pile and tomentum of pleura and breast white. Scutellum golden- 

 yellow tomentose, bristles black. Abdomen deep orange-yellow tomentose. a 

 cro.ss-band of white tomentum on base of second, third and fourth segments, and 

 at apex of the first and sixth segments, the former cross-band or orange yellow in 

 the middle ; sides of first and base of second segment on the sides abundant, 

 rather long, white pilose, sides of rest of abdomen nearly de.stitute of pile; 

 venter orange-yellow tomentose, on the base broadly, and at apex of the penul- 

 timate segment narrowly white. Legs white tomentose, front tibiaj destitute of 



TR.\NS. AM. ENT. SOC. XIX. JULY, 1892. 



