tItE CANADIAN KNTOMOLOGIST. l60 



silvery, libias bristly, claws and pulvilli elongate, latter smoky tawny. 

 Wings grayish-hyaline, transverse and fourth veins black, other veins more 

 or less tawny ; tegulse nearly white, halteres light rufous. 



$ . — A specimen which I take to be the female of this species differs 

 in having no golden shade, except very faintly on scutum ; the front is 

 hardly one-fourth width of head, and there are no orbital bristles. Macro- 

 chaetas hardly as thick ; claws and pulvilli scarcely shorter. 



Length of body, ^J , 5 to 6^ mm.; $ , Gys mm.; of wing, ^ , 4^ to 

 S^ mm.; ?, s}4 mm. 



Described from six males and one female ; Las Cruces, N. Max, 

 June 3. 



Leucostoma neomexicana, n. sp. $ . 



Eyes brown ; frontal vitta velvety black ; sides of front, face and 

 cheeks silvery-white, the sides of front shading to dark, epistoma whitish ; 

 antennae and arista black, the third antennal joint no longer than second ; 

 proboscis about as long as height of head, blackish, labella brownish ; 

 palpi rufous yellow ; occiput black, black-hairy. Thorax and scutellum 

 dark bluish-black, shining. Abdomen shining black, last two segments 

 thinly silvery pollinose ; first segment with a lateral pair and a median 

 marginal pair of macrochaetas, other segments with a marginal row ; 

 whole abdomen clothed with long macrochaeta-like bristles, making the 

 real macrochaetae difficult to distinguish, whence the first segment might 

 almost be said to have a marginal row. Legs black, claws and pulvilli 

 elongate, pulvilli silvery. Wings almost hyaline, veins tawny at base ; 

 tegulae very large, pure white ; halteres blackish. 



Length of body, 4}^ mm. ; of wing, nearly 4 mm. 



Described from one specimen ; Las Cruces, New Mexico. June 29. 

 This species has the third antennal joint no longer than the second, and 

 is therefore distinct from the species described by v. d. VVulp and doubt- 

 fully identified by him as L. ana/is, Meig. (Biol. C.-A. Dipt. IL), His 

 species is perhaps a Leucostoma, but the second species, Z. gravipes, v. 

 d. W., is probably a Phyto. Leucostoma should be restricted to the 

 smaller species with unusually large tegulae. 



