112 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



No. 68. DOLICHOPUS RUPESTRIS Haliday. 



Dolichopiis rupestris Haliday, Ent. Mag., vol. 1, 1833, p. 164. — Schiner, Fauna 



Austr., vol. 1, 1862, p. 222. 

 Dolichopus festinans Zetterstedt, Insecta Lapp., 1840, p. 708. — Coquillett, 



Proc. Wash. Acad. Sci., vol. 2, p. 424. 

 Dolichopus fuscimanus Zetterstedt, Dipt. Scand., vol. 2, 1843, pp. 507, 510. 



Male. — Length, 5 mm.; of wing, the same. Face wide, a little 

 wider at widest point than the widtn of the third antennal joint; yel- 

 lowish brown, more whitish on the lower portion. Front bronze 

 brown, shining. Antennae wholly black; third joint a little longer 

 than wide, ovate, still a little pointed at tip. Palpi brownish. Orbital 

 cilia wholly black. 



Thorax bronze brown, dulled with rather thick brown pollen; 

 pleurae more blackish, dulled witli gray pollen. Abdomen dark 

 green, the last two segments more bronze brown; the white pollen of 

 its sides extends over the dorsum and leaves a median line and the 

 hind margins of the segments blackish. Hypopygium black; its 

 lamellae of moderate size, somewhat quadrilateral in outline, more pr 

 less brownish with a black border, jagged and bristly on apical margin, 

 otherwise fringed with black hairs. 



Fore coxae black, sometimes more or less reddish, as if immature, 

 clothed on the anterior surface with little black hairs; middle and 

 hind coxae almost wholly black, femora yellow. Middle and hind 

 femora each with one preapical bristle; posterior pair with a olack or 

 brown spot on upper surface at tip, nearly bare below; tibiae yellow; 

 hind tibiae a little swollen on inner side at basal third and at tip, 

 black at tip for one-sixth their length; the glabrous stripe on upper 

 surface wide and distinct, reaching their entire length and extending 

 on to the inner side on the swollen portion; sometimes this swollen 

 portion has a reddish brown streak. Fore and middle tarsi one and 

 a fourth times as long as their tibiae, black from the tip of the first 

 joint, first joint of the former as long as the three succeeding joints 

 taken together, second joint a little longer than the third, fourth and 

 fifth joints of nearly equal length. Hind tarsi wholly black. Calyp- 

 ters and halteres yellow, the former with black cilia. 



Wings (fig. 68) dark grayish; costa with a knotlike enlargement at 

 tip of first vein; last section of fourth vein a little bent just before 

 its middle; hind margin of wing not indented at tip of fifth vein; 

 tips of third and fourth veins widely separated: anal angle of wing 

 rather prominent. 



Female. — Face wider and more yellowish or whitish than in the 

 male; hind tibiae not swollen on inner side; costa without an enlarge- 

 ment; color of the thorax more greenish; otherwise about as in the 

 male. Middle tibiae with one bristle below, their basitarsi without 

 a bristle above, but with a rather large bristle below near the middle 

 and several small ones; the male also has these bristles on the lower 



