Records of Dees. G69 



silvery-wliite hair ; mesothorax broadly bordered in front 

 (except ill middle) with pale ochreous hair, these bands 

 giving- rise at their inner ends to subtriangular but thin and 

 inconspicuous backwardly dii-ected lobes (in subalpinus are 

 instead two rather narrow longitudinal bands, and no hair 

 along the front except at extreme sides) ; pleura densely 

 covered with hair, white below, ochreous-tinted above ; 

 scutellum strongly depressed in middle, and axillar teeth 

 larger ; tegulse brighter red ; black transverse area on first 

 abdominal segment with its edges more or less overlapped 

 by hair, not clean-cut ; apical band of first segment not 

 interrupted. Apical plate of abdomen narrow, dark rufous ; 

 fourth and fifth ventral segments fringed with fuscous hair. 

 Eyes green ; antennae black, with the third joint red below. 

 Legs red, with the anterior femora black, their tibiae black in 

 front, middle femora with a suft'uscd black area above; 

 spurs black; second s.m. triangular, narrowed to a point 

 above ; band on second abdominal segment with a large 

 rounded lobe on each side. 



Hub. North Boulder Creek, Boulder County, Colorado, 

 in the Canadian Zone, Aug. 22, 1907 [S. N. Rohwer). 



I thought at first that tliis was the male of T. subalpinus, 

 but there are too many differences, and I can only suppose 

 that the two are very closely related but distinct species. 

 In Robertson^s table of Triepeolus (1903), T. rohrveri runs 

 nearest to T. helianthi, from which it differs by the hairy 

 pleura and other characters. As in helianthi, the labrum is 

 black. 



Triepeolus pcsnejjectm'alis, Viereck, 1905. 



Wawawai, Washington State, both sexes, $ Sept. 6, 

 c? Aug. 30, 1908 {JV. M. Mann). 



New to the United States, and the male is new. The 

 male is like the female except for the usual sexual differences, 

 and the rather greater development of the light hair. The 

 longitudinal bands on the mesothorax in front reach the 

 anterior margin, the whole of the anterior part of the pleura 

 is covered with hair, and the basal hair-band of the first 

 abdominal segment is not broken. Mr. S. A. Rohwer 

 studied this species somewhat, and noted that it was closely 

 related to T. subalpinus. The female is readily separated 

 from subalpinus by the larger and broader pygidial area 

 (false pygidium), the upward lateral hair-lobes on second 

 abdominal segment directed inwards so as to make an acute 

 angle with the transverse band (in the manner of T. pecto- 



