ZooL.— Vol. II.] WHEELER— DOLICHOPODIDM. 35 



pubescence. Front shining dark metallic green. Postocular cilia abundant, 

 black above, snowy white below. Thorax, scutellum and abdomen rather 

 dark metallic green, in some specimens with golden or coppery reflections; 

 the thorax with a thin layer of white dust anteriorly, the abdomen growing 

 darker towards the tip and bearing long white hairs on the sides of the basal 

 segments. Hypopygium shining black; lamellae simple, about one-third as 

 long as the abdomen, each drawn out into a fine point which is often convo- 

 luted in dried specimens. These appendages are yellow, infuscated at their 

 tips and fringed with delicate hairs along their edges. Internal hypopygial 

 appendages club-shaped, black or dark brown. Pleurae dark metallic green, 

 covered with white dust which is rather thin on the mesopleurae. Coxae con- 

 colorous with the pleurae, fore pair broadly, middle and hind pairs more 

 narrowly tipped with yellow; fore and middle pairs thickly covered with sil- 

 very white hairs on their anterior surfaces. There are no black bristles on 

 the middle coxae, but a spur-like cluster of white bristles at the tip. Legs 

 rather bristly; fore and middle pairs yellow, the former with their femora 

 blackish green excepting their bases and apices; tarsi blackened from the 

 tip of the first joint; fore metatarsus plain, hardly as long as the remaining 

 four joints taken together. Posterior surfaces of fore femora with several 

 long, stout hairs. Hind legs slightly elongated, their tibiae and metatarsi 

 somewhat incrassated, deep black, with the exception of the basal halves of 

 the femora which are yellow and the basal portion of the tibiae which is 

 brownish on the upper surface. Wings slightly narrowed towards their 

 bases, grayish hyaline; veins brown with yellow roots; the third and fourth 

 veins at first converge gently, but on approaching the tip of the wing become 

 parallel, the fourth terminating a very short distance before the tip. Halteres 

 and tegulae pale yellow, the latter with white cilia. 



Female. Length 3.5 mm.; length of wing 3.25 mm. Proboscis and palpi 

 large. Face broad, somewhat projecting, with strongly marked transverse 

 suture; both the palpi and face covered with gray dust. Antennae small, 

 black; third joint of about the same shape as that of the male, but not one 

 and a half times as long as broad; arista longer than the antenna. Post- 

 ocular cilia abundant, silvery white. Front, thorax, scutellum and abdomen 

 bright cupreous, the abdomen more metallic green on the sides. Venter and 

 pleurae thickly covered with gray dust. White hairs on the anterior faces of 

 the fore and middle coxce distinct. Legs resembling those of the male in 

 coloration, except that only the apical third of the hind tibia is black. Fore 

 and middle tarsi with black tips to the first and second joints; third, fourth 

 and fifth joint and the whole hind tarsus black. Wings broader towards 

 their bases, and veins more extensively yellow at their roots than in the male. 

 Third and fourth veins lyrate, at first approaching each other gradually and 

 then separating slightly at their tips. 



Three males from Milwaukee, Wis., and two males a;nd 

 two females collected in the canons of Buck Creek and 

 Little Wind River, Wyoming, during Aug. and Sept., 1895. 



This species, which I formerly took to be the same as 

 Loew's P . longipes^ appears to me, after careful reperusal 



1 Psyche, June, 1890. 



