50 U. S. p. R. R. EXP. AND SURVEYS ZOOLOGY 47TH PARALLEL. 



E. sidcipennis. I formerly considered this as a geographical variety of E. ohscura, but it 

 differs in having a larger and less convex thorax. I am not yet sufficiently advanced in the 

 study of this very difficult genus to determine whether it should he placed as a species or as 

 a race. 



E. granulata, elongato-ovata, nigra parum nltida, capite thoraceque suhaequa liter punctatis, 

 hoc suhquadrato, minus convexo, latitudine paulo breviore, lateribus rotundatis, ad basin vix 

 sinuatim rotundato, angulis posticis obtusis rotundatis, elytris thoracelatioribus, ovalibus apice 

 valde declivibus subacutis, dorso minus convexis seriatim grani;latis et parce muricato-punctatis, 

 versus suturam subseriatim punctatis; humeris subproductis ; prosterno postice producto ; femo- 

 ribus muticis. Long. "oS. 



Oregon ; Gol. McCall. This and the next species are somewhat similar in form to E. quadri- 

 collis, but are less convex. The sculpture of the elytra is peculiar, being formed of small, some- 

 what shining, flat tubercles, arranged in series, with intervening scattered acute elevated 

 punctures. 



E. humeralis, longior ovata, atra opaca, capite thoraceque densius punctatis, hoc parum 

 convexo, latitudine paulo breviore, suhquadrato, postice angustiore, lateribus rotundatis, ad 

 basin fere truncato, angulis posticis obtusis, elytris ovalibus, thorace latioribus, obsolete striatis 

 dorso depressis ad apicem subacutis valde declivibus, granulis subacutis parvis minus confertim 

 inordinatim positis, versus suturam punctatis ; prosterno postice perpendicular!, femoribus 

 muticis ; tibiis anticis calcari interno duplo longiore. Long. "57 — "65. 



Wenass river to Fort Colville ; Dr. Cooper. Readily distinguished by the foregoing char- 

 acters. By the larger size of the spur of the anterior tibire, it tends towards E. tricostata, and 

 several nondescript species. 



E. cordata. Specimens of three forms, allied to this species, were obtained in Oregon, and, 

 although evidently differing from those collected by me in California, I am not able to decide 

 regarding the propriety of separating them. They may be known by the thorax being more 

 broadly dilated^ and more regularly rounded on the sides, although equally densely and 

 coarsely jjunctured ; the posterior sinuation is therefore much shorter, although the basal angles 

 remain rectangular. The other distinctions are as follows : 



1. E. rohindipennis. Thorax veiy much constricted behind, fully one-half wider than lo ; 

 elytra as coarsely, but less densely punctured. Length, '45 — '55. 



2. E. sir iota. Thorax less suddenly, but very much constricted at base, fully one- alf 

 wider than long ; elytra more coarsely and less densely punctured. Long. "62. 



3. E suUigata. Thorax only moderately constricted at base, scarcely wider than long ; 

 elytra punctured as in E. cordata. Length, •44. 



Helops Fabr. 



H. la'lus, supra piceo-aeneus pernitidus, capite thoraceque confertim punctatis, hoc lateribus 

 fortius raarginatis, margine rufo-piceo, angulis anticis valde rotundatis, posticis subrectis sub- 

 rotundatis ; elytris striis profundis, interstitiis parce punctulatis, ante medium lateribus paulo 

 concavis : subtus rofo-piceus. Long. "33. 



One specimen, Steilacoom, Mr. Gibbs. Somewhat allied to H venustus Say, but smaller and 

 broader, with the sides of the thorax broadly margined, and the spaces between the strite of the 

 elytra less convex. 



