THE CANADIAN ENTOMOLOGIST. M? 



COLORADO BOMBID.E. 



BY E. S. G. TITUS, URBANA, ILL. 



During 1900-01 I made some studies on the Bombidre occurring in 

 Colorado. This paper is an abstract of those studies, the main body of 

 which is in an unpublished thesis deposited with the Secretary of the 

 Stale Board of Agriculture at Ft. Collins, Colorado. The material used is 

 in the collection at the State Agricultural College of Colorado, and in my 

 own collection ; also a (ew specimens at the U. S. Nat. Mus. Most of 

 the collection passed through the hands of Mr. Wm. H. Ashmead, who 

 corrected determinations and who very kindly looked over the table 

 given below, not only making corrections in it, but adding some species I 

 had not recognized. 



It will, of course, be understood that colour characters referred to in 

 the table always mean colour of pubescence. 



Table of Species. 

 I. — Abdomen without orange-red band. 

 Dorsum of thorax generally entirely yellow. 

 A. Apex of abdomen black. 



First segment yellow, rest black Virginicus. 



First segment yellow, next three fulvous dorsalis. 



First two segments yellow, rest black vagaus. 



First two and basal middle of third segment yellow, 



rest black Morrisonii, ? . 



First three segments bright lemon-yellow, rest glossy 



black perplexus, £ . 



First three and middle of fourth segment yellow, rest 



black Morrisonii, £ . 



AA. Apex of abdomen fulvous. 



First three segments yellow, rest, except apex, 



black var. Hudsonicus, $ . 



Dorsum of thorax more or less black on the disk. 

 A. Apex of abdomen black. 



First segment yellow, basal middle of second yellow or tawny, rest 



black separatus. 



First three segments yellow, rest black Netadensis, 5* . 



AA. Apex of abdomen black and fulvous. 



First three segments yellow. . , . Nevadensis, $ , 



