June 1890.] 



PSJ'CHE. 



361 



ing, covered with coarse yellowish dust. An- 

 tennae black, basal joint short, third joint 

 large, hairy, much shortened and expanded 

 so as to appear kidney-shaped ; arista appar- 

 ently with apical insertion. Front subquad- 

 rate, together with the occiput covered with 

 coarse yellowish dust; cilia of the superior 

 orbit short and black; those of the inferior 

 orbit long and conspicuous, of a yellowish 

 tint. Thoracic dorsum, scutellum and abdo- 

 men metallic green, covered with coarse yel- 

 low dust, which is very thick on the thorax 

 and scutellum, but much less so on the abdo- 

 men. Pleurae black, dusted with white, the 

 anterior portions more metallic green. Tegu- 

 lar cilia pale yellow, appearing brown in 

 some lights. Abdomen covered with short 

 black hairs, which are almost lacking on the 

 terminal segment where they are prominent 

 in other species ; hypopygium black, the tips 

 of the concealed appendages pale yellow. 

 Coxae black, dusted with white. . Femora 

 vivid metallic green, broadly tipped with yel- 

 low; tibiae and tarsi yellow, the latter with 

 enlarged pulvilli on all the feet; anterior 

 tarsi blackened from the tip of the first joint; 

 hind tarsi brown from the tip of the first 

 joint, only the last joint more blackish. The 

 black hairs and spines on the legs of about 

 the usual length. Halteres honey yellow. 

 Wings gravish hyaline, with brown veins, 

 which become yellow towards their origin ; 

 third and fourth longitudinal veins nearly 

 parallel on the apical third of the wing; pos- 

 terior cross-vein at about the middle of the 

 wing ; anal angle not very prominent. 



Habitat: Saline Co., Nebraska. 



The peculiar configuration of the 

 third antennal joint readily distinguishes 

 this species from D. leticostomus, to 

 which it is in most other respects close- 

 ly afliliated. 



PORPHYROPS LONGIPES, LOEVV. $ . 



Length 3.5 mm; length of wing 3 mm. 

 Palpi black, with a few rather long black 



hairs. Face narrow, silvery white; antennae 

 black, basal joint smooth and rather slender; 

 third joint flattened, lanceolate, a little more 

 than twice as long as broad at the base, cov- 

 ered with short and even pubescence, apex 

 somewhat rounded ; arista straight, distinctly 

 longer than the whole antenna, with ap- 

 pressed scarsely perceptible pubescence. 

 Front and occciput metallic green, slightly 

 dimmed by a layer of whitish dust ; cilia of 

 the superior orbit black, those of the inferior 

 orbit silvery white, abundant and increasing 

 in length towards the oral orifice. Thoracic 

 dorsum and scutellum dark metallic green, 

 shining sometimes with a slight cupreous re- 

 flection ; the former with traces of white dust 

 lines on its anterior part; pleurae greenish 

 black, overlaid with whitish dust. Tegulae 

 pale yellow with silvery white cilia. Abdo- 

 men concolorous with the thoracic dorsum, 

 terminal segments more violaceous; the 

 hairs with which it is rather abundantly cov- 

 ered are black, except on the lateral surfaces 

 of the basal segments where they are long, 

 tufted and silvery white ; hypopygium shin- 

 ing black, the external appendages long and 

 filiform, sometimes coiled up in dry speci- 

 mens, pale yellow, strongly infuscated at 

 their edges and clothed with conspicuous 

 black and white hairs; claspers and internal 

 appendages blackish. Coxae blackish green, 

 tipped with pale yellow, each bearing on its 

 anterior face a tuft of silvery white hairs, 

 which are longest and most abundant on the 

 fore pair. Legs hairy ; the fore and medium 

 pairs pale yellow, the former with the femora 

 blackish green, excepting their bases and 

 apices ; tarsi blackened from the tip of the 

 first joint; metatarsal joint of the fore feet 

 hardly as long as the remaining tarsal joints 

 taken together; there are several long white 

 hairs on the posterior faces of the fore femora ; 

 median femora somewhat longer and more 

 slender than the fore femora; hind legs 

 elongated, femora, tibiae and basal tarsal 

 joints incrassated, deep black with the ex- 

 ception of the basal halves of the femora, 



