256 Annals Entomological Society of Ani?rica [Vol.11, 



Second submarginal cell long and slender; its length about 2620; 

 its breadth in middle 374, and near end about 510; the upper branch 

 of the third vein more bent at the fork than the lower. In Dasypogon 

 this cell is very much wider apically, and in Nicocles rufus considerably 

 so. 



Anterior cross-vein 1310 from the fork of third vein and 850 from 

 end of discal cell ; in being beyond middle of discal cell it differs con- 

 spicuously from Dasypogon. 



Second and third posterior cells normal; first posterior not widen- 

 ing apically. (It widens in .V. rufus.) 



Fourth and fifth posterior cells normal, widely open. 



Anal cell open, about as in Dasypogon. (Closed in A^ rufus.) 



This seems to be a Nicocles, a genus well represented in America 

 today. The type of Nicocles, according to Verrall, has the anal cell 

 open. 



Habitat. — Miocene shales of Florissant, Colorado, 1909 {Terry 

 Duce). While on Asilidae I wish to record the occurrence of 

 Laphria fernaldi {Dasyllis fernaldi Back) at Teller Lake (near 

 Tolland), Colorado, alt. 9575 feet ( /. Henderson). A single male 

 was taken July 29, 1909. This fine species, described vaguely 

 from "Colorado," curiously simulates the red-banded Bombi 

 common in the same vicinit}^ This resemblance to Bombus 

 has been noticed by P. R. Jones^ (Trans. Am.l^Ent. Soc, 1907, 

 p. 282.) 



. EXPLANATION OF PLATE XXVIIL 



Eriocampoides revelatus Ckll., venation. 

 Microstylum destructum, venation. 

 Megaxyele petrefacta Brues. 

 Syrphus aphidopsidis Ckll. 

 Odvnerus terrvi Ckll. 



