AI.DRICH : IxM.U'HOPrs AXD IIVC;R0CKI.F,UTHUS. 7 



8^. Last joint of male fore tarsi enlarged ruficornis, Loew. 



Last joint not enlarged ; third and fourth joints fringed with 



black above ciipriiuis, Wiedemann. 



Dolichopus johnsoni, n. sp. 



Legs and cilia of orbit and tegulte black ; wings infuscated. 



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

 third joint rounded. Thorax shining green, rather dark ; pleur?e, 

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

 rior margins of segments blackish. Lamella; of hypopygium white 

 with brown border and bristles. Coxie 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 tibiee 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 Oslcn Sacken. 



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

 description, but 4.5 mm. long. The fore coxse have a thin silvery 

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

 there are a few bristles; hind tibicC 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 T^opw. 



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



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

 black ones with only a slight admixture of j)ale. 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 tibiae yellow. I should consider the hind tibiae thickened. 

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



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

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

 veins, and minor differences. 



Dolichopus gratus Lopw. 



A single male. White Mts., Aug. {V . 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. 



