AMERICAN DIPTERA. 235 



Ileiuerodroinia inexicana sp. nov. (Figs. 56, GOi. 

 Male, — Length 2.5 mm. Head black, depressed. Face narrow, shining, white, 

 lower occiput thickly covered with white pile. Antennae and proboscis wholly 

 yellow; last antennal joint but little longer than basal part, cordate. Thorax 

 rather elongate, black, finely punctured ; humeri testaceous, mesonotum a little 

 depressed. Abdomen as long as the thorax, piceous, sordid above; hypopygiuni 

 black, basal filament visible. Legs pale yellow; anterior femora a little thicker 

 than the others, slightly longer than their coxae; tarsi dusky towards tip; no 

 bristles present. Wings hyaline, as long as the body, hind border somewhat 

 more rounded than in scapularis ; veins fuscous, no stigma, tip of marginal cell 

 on a line with the end of the second basal, second basal united with the discal, 

 sending three veins to the margin, anal vein attenuated at base. 



Very similar to scapularis Loew, but differs in its smaller size, 

 rather more robust form, exposed basal filaments of hypopygiuni, 

 more rounded wings, stronger patch of infraocular pile and less 

 depressed mesonotum. 



One male from Orizaba, Mex., December, 1887. 



HemerodromJa eollii»$or sp. nov. (Figs. 57, 58, 64) 



Length 3.5-4 mm. — Black, thorax covered with bronzed-gray pollen, abdomen 

 finely gray pruinose. Head depressed ; vertex and occiput cinereous-dusted ; 

 face moderately narrow above, wider below, candid, with slight yellowish tinge. 

 Mouth opening large. Palpi whitish, proboscis reddish, its extreme tip black ; 

 proboscis directed backwards, a little longer than the antennae. Antennae red- 

 dish, short, thick, third joint ovate, pointed, its terminal arista black, thick, 

 short, less than one-half of the length of the third joint. Ground color of the 

 thorax and abdomen black, overlaid with bronzed dust on the notum and cine- 

 reous on the pleurae; mesonotum depressed on the posterior half; scutellum with 

 two closely placed, moderately long, dusky bristles. Abdomen compressed, a 

 little longer than the thorax ; hypopygium somewhat shining, erect, with dusky 

 bristles at tip, in height equal to three abdominal segments ; ovipositor somewhat 

 recurved, black dorsally, fulvous at base and ventrally. Legs yellowish; front 

 legs raptorial, coxae two-thirds the length of the femora, femora thickened, with 

 dusky bristles beneath, together with minute black setulae, tibiae provided with 

 erect small hairs and an apical bristle; middle and hind legs slender, with no 

 bristles, sometimes the apical joints of the tarsi are dusky. Halteres yellow. 

 Wings hyaline, veins yellow, marginal cell not stunted, third and fourth veins 

 forked, discal cell united with the second basal, sending out two veins to the 

 margin, anal cell complete. 



Seven males and fifteen females ; taken at Dubois, Wyoming, and 

 Dinwiddie Creek, Wyoming, by Dr. Wheeler, at an altitude of 

 7200 feet, during the early part of September, 1895. 



One female collected by Prof. C. F. Baker in Colorado. 



Hemerodroinia defecta Loew. 

 Cent., ii, 55. 

 Whitish, apex of the hypopygium and the last two joints of the tarsi suhfus- 



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



