34 COLEOPTERA RHYNCHOPHORA. 



and three on the West Coast, one of which ranges as far east 

 as Montana, Colorado and New Mexico. 



Of the western species — gracilis, aenescens and subtincia — 

 the first two are distinguished by the very densely punctate 

 thorax and the obvious pubescence of the upper surface, the 

 scutellum quite densely clothed. They are very closely 

 allied, and dependence seems to have been placed entirely 

 on the aeneous surface lustre of aenescens. This is feeble or 

 entirely wanting in some specimens, which then are not dis- 

 tinguishable with certainty from gracilis by any characters 

 that I can discover. In general it may be said that the elytral 

 striae are less deep and the intervals less convex toward the 

 suture, with a slight tendency to alternation in convexity 

 posteriorly in aenescens, but these characters fail more or less 

 completely in some examples. \ng7'acilis the striae are uni- 

 formly deep, the intervals convex and uniform so far as I 

 have observed. Aenescens occurs from southern Alaska to 

 northern California. Gracilis is found in the vicinity of San 

 Francisco and also in western Nevada if I have correctly 

 referred a number of specimens taken at Reno by Professor 

 Wickham. 



Subtincta differs from the two preceding by the more 

 coarsely and less densely punctured thorax, and in none of 

 the specimens at hand is there any obvious pubescence on 

 the upper surface. The type locality is Gilroy, California, a 

 little south of San Francisco, but the species is quite widely 

 dispersed. It is known to me from many localities in Califor- 

 nia ; from Oregon; Washington; Vancouver Island (Vic- 

 toria); Montana (Kalispell); Colorado and New Mexico 

 (Pecos and Ponil Canon). Specimens taken by me on alders 

 in the San Bernardino Mountains of California are evidently 

 more shining than the type, but the differences seem to me 

 no more than racial. In a Pasadena specimen the elytra are 

 faintly greenish, in others there is a barely perceptible bluish 

 tint, but the majority, including the type, are black or very 

 nearly so. 



Of the eastern species olyra is easily known by the distinct 

 ochreous pubescence of the upper surface, the densely pubes- 



