ALDRICH : I)OLirH(M'US AXT1 H VGR(1CF.LF.UTHUS. 7 



«3. Last joint of male fore tarsi enlarged riificornis, Loew. 



Last joint not enlarged ; third and fourth joints fringed with 



black above ciiprinus, Wiedemann. 



Dolichopus johnsoni, n. sp. 



I,egs and cilia of orbit and tegulte black ; wings infuscated. 



Face narrow, with yellowish pollen ; front green. Antenna black, 

 •third joint rounded. Thorax shining green, rather dark ; pleurae, 

 black. Tegulee and halteres yellow. Abdomen dark blue-green, poste- 

 rior margins of segments blackish. Lamella of hypopygium white 

 with brown border and bristles. Coxge black, yellow tipped, the 

 front ones white dusted. Femora black, knees yellow; anterior tibiae 

 yellow, hind ones black. Anterior tarsi yellow, infuscated toward the 

 tip: hind ones black. Fore tarsi simple. Hind tibis a little thick- 

 ened. Wings narrowed toward the base, the outer two-thirds strongly 

 infuscated, the smokiness fading away gradually toward the root. 



Length, 3.2 mm.; of wing, 3 mm. 



One male, Jamesburg, N. J., July 4, '91 (C. W. Johnson). 



Dolichopus corax Osten Sackeii. 



One female, California (U. K.), agreeing with Osten Sacken's 

 description, but 4-5 mm. long. The fore cox^e have a thin silvery 

 dust, and but little hair except on the lower and outer edge, where 

 there are a few bristles; hind tibiae with a row of about six strong 

 bristles uniformly placed on the hind side, also a row of delicate ones 

 on the front side. 



This is the only species known that has black femora and enlarged 



fore tarsi in the male. 



Dolichopus laticornis Loew. 



Two males, no locality (U. K.). 



In one specimen the tegular have pure light yellow cilia; in the other, 

 black ones with only a slight admixture of pale. The yellow of the 

 middle femora is more extended than the description states, leaving, 

 in the one case the basal half, in the other a mere basal ring, black. 

 Middle tibia; yellow. I should consider the hind tibia- thickened. 

 The convergence of the third and fourth veins is very slight. 



A female from Conn. (U. K.), related to this species, has mixed 

 tegular cilia, hind tibia nearly all black, wings infuscated along the 

 veins, and minor differences. 



Dolichopus gratus Loew. 



A single male, White Mts., Aug. (U. K.). The hind femora are 

 ciliated the whole length, longest in the middle; in the other species 

 with black femora, as far as known, the cilia are on the apical half. 



