OHAPTER*XIV. 



The collection made by this expedition is somewhat interesting, although 

 small, and in a much damaged condition, partially the result of preserving 

 the specimens in alcohol, which should never be used for this purpose for 

 these insects. 



A large portion of the collection of 1874 was unfortunately destroyed 

 by an accident on the Baltimore and Potomac road, which is much to be 

 regretted. Some of the species which are new were collected at the same 

 time by the United States Geological Survey of the Territories in Colorado ; 

 and as these specimens were received before those of this expedition they 

 were described in its report for 1873. 



FAM. PERLINA. 



PTERONARCYS. 

 PTERONARCYS BADIA, Hagen. 

 Pteronarcys liadia, TJ. S. Geol. Surv. Terr., 1873, 573-574. 



Pale brown ; head dull yellowish, with a large square black spot 

 around the ocelli ; antennae brown, paler beneath. Prothorax square, the 

 anterior margin rather rounded, the angles right, pale brown, with darker 

 shading on each on the elevated marks. Abdomen pale above, darker in 

 the middle, pale brown beneath ; the apical margin of the penultimate ven- 

 tral segment largely excised ; the dark-brown middle part of the segment 

 somewhat produced, without reaching the last segment ; seta? pale-brown ; 

 feet darker brown ; wings yellowish-hyaline, with a dull-yellow stigma ; 

 veins brown. 



Length, 17-19 millimeters ; alar expansion, 31-33 millimeters. 



HAB. Bridger basin, Wyoming (Garman); Cache Valley, Utah (C. 

 Thomas); Colorado Mountains, August (Lieut. W. L. Carpenter). 



911 



