370 ENTOMOLOGICAL NEWS. [Dec., '06 



Some New or Little-known Genera of Empididae.* 



A. L. MELANDER, Pullman, Washington. 



In the following pages are noted the occurrence in North 

 America of several genera of the dipterous family Empidida, 

 that are not given in our publications. Their publication is 

 given at the present time in order to explain more fully the 

 citations that will appear in the forthcoming edition of Dr. 

 Williston's Manual. 



TACHYDROMIIN^. 

 CHERSODROMIA Walker, f 



This genus is known from six European species and one 

 from Australia. We have one described species in our fauna 

 that belongs to this genus. It is Stilpon houghii Melander, 

 placed in Professor Aldrich's Catalogue of the North American 

 Diptera in the genus Coloboneura. 



THINODROMIA gen. nov. 



Thinodromia inchoata spec. nov. 



Thick-set, black, pruinose, black-bristly little species with dorsal 

 arista and aborted wings. Eyes deeply emarginate at the antenna?, the 

 facets uniformly large : face and front of male and female similar, of 



equal length and uniform breadth,gray pruinose ; 

 the hollowed vertex also gray pruinose, with 

 three large ocelli, and strong ocellar bristles; 

 occiput gray pruinose, the occipital bristles 

 moderate ; palpi large, flat, elongate-ovate, 

 white pruinose, with a few black hairs, over- 

 lapping the proboscis; proboscis very stout, 

 pointed, bent back; antennae three-jointed, 

 though the first joint minute, the third joint 

 - short-ovate with a long arista arising fnnn 



near the middle of its dorsal side, the basal 

 T/niKiarfiniia mc/ioa/a a, . . 



antenna. joint of the arista short, the outer long and 



microscopically plumose. 



The pollen covering of the dorsum of the thorax more or less golden; 

 mesopleura with a polished black area not pruinose ; humeri not con- 

 stricted; humeral and supra-alar bristles large, acrostichal and dorso- 



*Contributions from the Zoological Laboratory of the State Col- 

 lege of Washington. 



t(Ins. Brit. I. xx., p. 137, 1851.) 



