Collect-, ClareniDiit, Californi.-i 



25 



pile on mesa- and sterno-pleura brown. Stem of halteres yellowish, 

 the knob yellow above and blackish bi-own below. 



Abdomen black, sepia brown pollinose, with rather long, erect 

 yellowish pile, nowhere dense enough to obscure the ground color. 

 Venter like the dorsum, the pile shorter and more reclinate. Sev- 

 enth visible segment projecting over the small eighth, the genitalia 

 quite small, colored like the abdomen, the upper and lower forceps 

 about equal in size and closing over the internal organs. Knees 

 reddish, the rest of legs black ; coxae and femora with long black 

 pile. Wings whitish hyaline, densely maculated with dark gray 

 and with remarkable thickenings of the membrane, some of which 

 appear to form supernumerary cross-veins (see fig. 1). The veins 

 near the posterior margin of the wing are wavy. 



EXPLANATION OF PLATE 

 Fig-. I. Wing of Acreotrichus nutculipetiiiis n. sp. ; fig. 2, head of A. mucn- 

 liljenuis; fig. 3, wrng oi MetacosiniiK nitidus n. sp. ; fig. 4, head of 

 M. nitidus; fig. .5, wing of PamcosDii^s vionisoni O. S. ; fig. (5, antennae 

 and front of head of Amphicosmiis vunditzeei n. sp.; fig. 7, head of 

 .4. vaudiizeei; fig. 8, wing of A. vunduzeei; 9, antenna of Villa 

 chrcmohpida n. sp. ; fig. 10, heal of V. cliroviolepida ; fig. 11, head of 

 Rliabdoselaphus setosiis Cresson. 



