Dec, 1902.] COQUILLETT : NeW NoRTH AMERICAN DiPTERA. 179 



reaching the mouth, arista bare, face gibbous; body polished, three pairs of dorso- 

 central bristles, all of them postsutural, the hairs between them not in rows, two 

 slernopleural bristles; wings hyaline. Length, 2.5 to 3.3 mm. 



Habitat.— \N\\\\d.m?, (June 7, H. S. Barber), and Oracle (June 

 30, Hubbard and Schwarz), Arizona ; and Mesilla Park, New Mex- 

 ico (April 28, T. D. A. Cockerell). 



Four specimens. Type No. 6631, U. S. N. M. 



Lauxania nigrimana, sp. nov. 



Black, lower edge of front above antennte, upper edge of face below antennae, 

 prolonged obliquely to lower front corner of cheeks, posterior half of cheeks, bases of 

 antenna;, the halteres and legs except apices of front femora and whole of their tibise 

 and tarsi, yellow, antennal arista white, pubescent ; head polished, a large spot be- 

 low ocelli and the yellow portion of face and cheeks whitish pruinose ; face gibbous, 

 third joint of antenna slender, over four times as long as its greatest width ; body 

 polished, the mesonotum and scutellum except the sides of the former opaque, gray 

 pruinose, sternum whitish pruinose, three pairs of dorsocentral bristles, all of them 

 postsutural, the bristly hairs between the two rows arranged in four rows, two sterno- 

 pleural bristles ; wings yellowish hyaline. Length, 4 mm. 



Habitat. — Williams, Arizona. 



Two specimens collected Jul}- 23 and 26 by Mr. H. S. Barber. 

 Type No. 6632, U. S. N. M. 



Lauxania cineracea, sp. nov. 



Black, the base and under side of the antennae, the halteres and bases of middle 

 and hind tibiae and of their tarsi yellow ; head opaque, grayish pruinose, middle of 

 front marked with a pair of blackish vittae, center of face only slightly swollen, third 

 joint of antennae slightly over twice as long as wide, arista rather long-plumose ; thorax 

 opaque, gray pruinose, lateral margins of mesonotum brownish, the bristles and hairs 

 situated on brown dots, only two pairs of dorsocentral bristles, the bristly hairs be- 

 tween them arranged in four rows, one sternopleural bristle, upper side of scutellum 

 opaque, gray pruinose, the lower side somewhat polished, abdomen polished and hav- 

 ing a brassy tinge ; wings yellowish hyaline. Length, 3.5 mm. 



Habitat. — Biscayne Bay, Florida. 



A single specimen collected by Mrs. Annie T. Slosson. Type 

 No. 6633, U. S. N. M. 



Lauxania lutea, sp. nov. 



Reddish-yellow, the legs and abdomen light yellow, the latter with a rounded 

 black spot in middle of base of segments three to six ; head polished, face rather 

 strongly convex, front noticeably wider than either eye, ocellar bristles obsolete, third 

 joint of antennae nearly twice as long as broad, arista brown, rather long-plumose; 

 thorax highly polished, two pairs of dorsocentral bristles, the hairs between them not 

 arranged in rows, two sternopleural bristles ; wings strongly tinged with yellov/, penul- 



