338 



PSYCHE. 



[May 1890. 



form a similar link between the Doli- 

 c/wj>?/s-\\ke forms and the species of the 

 genus Chrysotlnms. 



DOLRHOPUS ALBICILIATUS, Loew. $. 



Length 6 mm. ; length of wing 4. 5 mm. 



Face narrow, covered with silvery white 

 dust. Antennae black, third joint small, 

 rounded anteriorly. Front dark bluish 

 green ; cilia of the superior orbit black, those 

 of the inferior orbit pale yellow. Thoracic 

 dorsum shining dark metallic green ; pleurae 

 black, anteriorly, with greenish bronze reflec- 

 tion, posteriorly dusted with white. Tegu- 

 lae with black cilia. Scutellum dark green 

 with violet reflection. Abdomen dark bluish 

 green, the terga of the first and second seg- 

 ments with violetVeflection ; incisures broad- 

 ly black; venter black, powdered with white 

 dust; hypopygium black, opaque, with pale 

 dull yellow lamellae of subtriangular outline, 

 apical margin rather evenly crenulate, broad- 

 ly bordered with black and fringed with deli- 

 cate long hairs ; penis and other appendages 

 pale yellow. Coxae opaque black, tipped 

 with yellow; the anterior pairs with several 

 curved black bristles on their fore faces; all 

 the femora black, with metallic green re- 

 flection, broadly tipped with yellow; anterior 

 tibiae pale yellow, with black setae, which are 

 conspicuously long on the fore pair; ante- 

 rior tarsi pale yellow, blackened from the 

 tip of the first joint; hind femora ciliated 

 with long and delicate hairs on their inner 

 faces; hind tibiae slightly incrassated, pale 

 yellow with their apical third black ; hind tarsi 

 black, the metatarsal joint slightly incras- 

 sated. Halteres dull yellow. Wings gray- 

 ish hyaline; veins black; the juncture of the 

 first logitudinal vein with the costa thickened, 

 though not to the degree observed in the 

 males of some allied species; last section of 

 the fourth vein appearing considerably 

 steeper than in the $ and meeting the costa 

 nearer the end of the third vein. 



Habitat : Wisconsin. 



Only the female of D. albiciliattis 

 was known to Loew. In view of the 

 fact that the male is from a taxonomic 

 standpoint by far the more important 

 sex in the study of the Dolichopodidae, 

 I have in this as in the case of a few of 

 the other species, of which the males 

 were unknown to Loew, inserted a 

 description. 



DOLICHOPLS INCONGRUUS, U. Sp. $. 



Length 5 mm. ; length of wing 4.75 mm. 



Dark metallic green. Palpi black; face 

 narrow, silvery white. Antennae large, 

 entirely black, the two basal joints short 

 and small; third joint unusually large, 

 flattened, suboval, doi-sal contour straight 

 with the arista inserted near its middle, 

 ventral contour evenly rounded. Pubescence 

 of the eyes distinct, white. Cilia of both the 

 superior and inferior orbits black. Front 

 and thoracic dorsum deep metallic green, 

 the latter with a cupreous reflection in the 

 median line and on its humeral edges; 

 pleurae black, dusted with white. Tegulae 

 yellow with yellow cilia. Scutellum and ab- 

 domen deep metallic green varied with 

 cupreous; venter black, covered with white 

 dust; hypopygium large, swollen, black 

 with metallic green reflection and white 

 dust; penis and internal appendages yellow ; 

 lamellae small, elongate oval, tapering but 

 rounded at their tips, edges black, scarcely 

 jagged and fringed with short and weak 

 black hairs. Coxae black, and like the 

 pleurae, dusted with white; apical third of 

 the anterior face of the fore coxae and tips of 

 the posterior coxae yellow; the usual tufts 

 of black hairs on the anterior faces of the 

 fore and median pairs and a single back- 

 ward directed seta on the lateral face of the 

 hind coxa. Fore legs yellow; the basal two- 

 thirds of the femora black; tarsi about as 



