THE CANADIAN ENTOMOLOGIST. 123 



TWO DIPTERA OF THE GENUS RHAMPHOMYIA FROM 



COLORADO 



BY T. D. A. COCKERELL, BOULDER, COLORADO. 



The large and varied genus Rhamphomyia (Empididie) is 

 known to be of considerable antiquity^ no less than twelve 

 species having been described by Meunier from Baltic Amber. 

 It is therefore not surprising to find a species in the Miocene shales 

 at Florissant. 



Rhamphomyia sepnlta, n. sp. 



Length 6 mm.; length of wing 5.65 mm.; wings brownish, 

 no stigmatic cloud; head, thorax and legs black; abdomen slender, 

 pallid; eyes well separated on vertex (the specimen apparently a 

 femalej ; antenna? with third joint elongate, but not so long and 

 slender as in the amber species R. errabunda, mlaloides and obtusa. 

 Venation of wings normal for the genus, the third longitudinal 

 vein simple; anal lobe large and abrupt, the lower margin before 

 the lobe with small bristles as in recent species; second anal vein 

 continuing in a straight or nearly straight line apicad, not de- 

 flected downward at the basal corner of the anal lobe. The follow- 

 ing measurements are in microns: Level of humeral cross-vein to 

 separation of second and third veins, 720; end of second vein to 

 end of third (in a straight line), 640; discal cell on first basal, 240; 

 discal cell on second basal, 304; discal on second po-tenor, 80; 

 discal on third posterior, 320; upper side of discal, 800. Miocene 

 shales of Florissant, Colorado, Station 13 {S. A. Rohiver). 



I take occasion to describe also a living species from a high 

 altitude. 



Rhamphomyia calvimontis , n. sp. 



Male — Length 6 mm.; length of wing 7.5; shining black, with 

 long black hair on head and dorsum of thorax; the face has a 

 little black hair, a character of Neocota Coq., but the species does 

 not seem otherwise allied to the type of that genus; sides of thorax 

 grey-pollinose; abdomen with glistening creamy-white hair, a 

 stiff band of bright ferruginous hair on the ventral surface sub- 

 apically (0 in figure); wings grey. Metapleural bristles present. 

 Legs entirely black. In Coquillett's key (Proc. U. S. Nat. Mus., 

 XVIII, pp. 410-418) it runs next to the Californian R. duplicls. 

 It is not identical with any of the species since described from 



April, 1916 



