134 ENTOMOLOGICAL NEWS. [May, 



interspaces running together, especially toward the margins and poste- 

 riorly ; body beneath smooth and shining. Length 11.5-13.3 mm. 

 Male with joints 1-3 of anterior tarsi spongy pubescent beneath. 



This species is related to C. marginatus Fisch., which it 

 closely resembles in form. It presents, however, the following 

 differences from that species, viz : pronotum less suddenly nar- 

 rowed behind with less evidence of sinuation, having the two 

 lateral longitudinal lines less well defined ; margins narrower 

 and less strongly reflexed ; the elytra are slightly more convex 

 with narrower margins, the latter having no trace of green or 

 gold coloring ; the striae are interrupted by the interspaces 

 running together forming lacunae, rather than the interspaces 

 being interrupted by punctuation ; 1 1 specimens collected b}'- 

 myself on Cedar Mountain, Latah County, Idaho, and 3 at 

 Collins, Idaho, 8 males and 6 females. 



The types are deposited in the collection of the Washington 

 Agricultural College, and duplicates will be sent to the Nat- 

 ional Museum and American Entomological Society. 



During the past two or three years I have collected quite a 

 number of specimens of Cychrus relidus and regularis on Cedar 

 Mountain, Idaho. C. relidus has also been collected at Spo- 

 kane and Pullman, and C. regularis at Wawawai, Washington, 

 by Prof. C. V. Piper. 



Relidus was described by Dr. Horn from a single male speci- 

 men collected at Spokane, Washington, by Mr. Ricksecker 

 (Trans. Am. Ent. Soc. , vol. ix, p. 188). 



Regularis was described from a single pair also collected by 

 Mr. Ricksecker in the Coeur d'Alene Mountains, Idaho (Tr. 

 Am. Ent. Soc, vol. xii, p. 2). In his description of this spe- 

 cies LeConte says : 



"Black, not very shining, of the same form and sculpture as C. relidus, 

 except on the elytra, which have twelve perfectly regular and entire im- 

 pressed punctured striae ; the 13th is composed of separate punctures con- 

 fused with the marginal ones ; the interspaces are somewhat wider than 

 the striae, the 4th and 8th are interrupted by only 3 or 4 punctures." 



I have made a close examination of a number of specimens 

 of regtilaris, and I find apparently all gradations between regu- 

 laris and relidus. I have four specimens of relidus from Spo- 

 kane, the type locality of this species, and have examined 51 



