AMERICAN DIPTERA. 339 



Page 205. STIIiPON. 



Sides of front and vertex nearly parallel ; hind metatarsi thickened and dark- 

 ened 2. 



Vertex broadened ; hind metatarsi not thickened 3. 



2. Veins bordered with brown ; abdomen brick-red varices Loew. 



Veins not bordered ; abdomen blackish pectiiiger mihi. 



3. Thorax closely pollinose; first vein ending at middle of wing. 



Hougliii mibi. 

 Thorax shining ; first vein ending before middle of wing 4. 



4. Legs yellowish ; basal cells equal, small ininuta. sp. nov. 



Legs black ; second basal cell larger uigripes sp. nov. 



' Stilpon nigripes sp. nov. 

 Male and Female. Length 1 mm. — Black species. Eyes nearly contiguous on 

 the face and just above the antennse ; vertex broadened. Proboscis short, in- 

 curved, black, palpi blackish, with dusky hairs. Antennae black, the outer joint 

 short ovate, rather pointed, not larger than the inner joint, thelong seta subter- 

 miuai. Thorax shining black, the sparse pubescence dusky, appressed, scutellum 

 with two long and two short bristles. Abdomen subopaque, black, hypopygium 

 large, gaping, the upper valve ascending, hood -shaped, shining, the lower portion 

 pedunculate, projecting, provided with many short bristly hairs on the outer por- 

 tion, a curved central exserted penis present. Legs black, short, robust, all the 

 femora moderately thickened, no swellings nor ciliation. Halteres black. Wings 

 clear hyaline, veins black, first vein much stronger than the others, ending at 

 middle of costa, second vein ending midway between first and third, third and 

 fourth veins parallel, fifth vein ending opposite the second vein, second basal cell 

 broad and one-half longer than the first, its cross-vein nearly perpendicular. 



One male and nine females. Alamogordo (Middle Sonoran) ; 

 HighroUs ( Upper Sonoran), and Cloudcrof't (Canadian Zone), New 

 Mexico. May and June, 1902. (H. L. Viereck.) 



Stilpoii miiiuta sp. nov. 

 Female. Length 1 mm. — Black, shining species, with yellow legs. Eyes con- 

 tiguous just below and above the antennse, front narrow, sides diverging, vertex 

 broad, triangular. Antennae dusky, the outer joint short, oval, the long seta 

 subdorsal. Proboscis short, incurved, black, palpi small yellowish. Thorax and 

 abdomen shining, their sparse hairs dusky, scutellum with two long and two 

 shorter bristles. Legs including the coxae dusky yellow, simple, not fringed, 

 femora but little thickened. Halteres dusky. Wings hyaline, unspotted, veins 

 dark fuscous, uniform, the second vein ends at the middle of the costa, second 

 section of the costa about one-half the length of the third, third and fourth veins 

 gradually diverging, basal cells short, equal, posterior cross-vein oblique, fifth 

 vein ends beyond the second vein. 



Three females; Cloudcrof't and Highrolls, New Mexico. June, 

 1902. (H. L. Viereck.) 



Page 207. Drapetis nilida mihi. 



Is the same as unipila Loew. 



TRANS. AM. ENT. SOC, XXVIII. SEPTEMBER, 1902. 



