Coleopf etiological Notices. 395 



come into ray possession during- the past five or six years, it is 

 desirable to make a few observations : 



1 The description of E. quadricollis given by Mannerheim reads 

 thus, in regard to the arrangement of the elyti'al punctures : " Mas : 

 elytris . . . dense striato-punctatis, punctis granuliferis. Femina: 

 elytris . . . obsolete striato-punctatis." 



1 have a specimen taken by myself near San Francisco, the 

 locality assigned by Mannerheim to quadricollis, which coincides 

 exactly with the above-described male of that species, and I there- 

 fore regard it as an authentic type ; its length is 15 mm. while that 

 of Mannerheim's type is 7 liu. 



The description of quadricollis given by Horn (Rev. Ten., p. 309) 

 reads as follows, in regard to the elytra : " Sculpture consisting of 

 punctures sometimes fine, at others rather coarse, rather densely but 

 irregularly placed and never muricate, never arranged in rows^ 

 The introduced italics indicate that the author quoted has mistaken 

 some other species — probably that described below as estriatus — 

 for the true quadricollis. 



It should also be stated that a very large series of genfilis which 

 I took at San Diego, shows quite clearly that this species should be 

 associated with quadricollis and vicinus, and is out of place in the 

 present arrangement. 



Finally the species named vicinus by LeConte is distinct from 

 quadricollis in having much finer punctures, which are sparser and 

 much less asperate toward the sides, and also in several other char- 

 acters, among which may be mentioned the form of the prothorax, — 

 widest at anterior third in quadricollis and just before the middle 

 in vicinus, — the much longer posterior tarsi in the male of vicinvs, 

 and the form of the penis which is very much more slender and 

 attenuate in quadricollis. Vicinus is peculiar to the Gila Yalle}" of 

 Arizona, a region zoologically quite distinct from that inhabited by 

 quadricollis. 



2 The species described by me as arcuatus (Cont. Col. N. A., 

 p. 47) belongs near carhoyiarius, and is not at all similar to extri- 

 catus. It will be observed that in extricatus the elytral punctures 

 are arranged in closely approximate and equally pronounced series, 

 giving a peculiar appearance to this species. Cognatus Hald. is 

 simply a specimen in which the punctures are finer, but the disposi- 

 tion of them is precisely the same and cognatus is truly a synonym. 



In cai'bonaj'ius the elytral punctures are arranged in widely dis- 



