50 
U. S. P. R. R. EXP. AND SURVEYS—ZOOLOGY-47TH PARALLEL. 
E. sulcipennis. I formerly considered this as a geographical variety of E. obscura, hut 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 nitida, capite thoraceque subaequa liter punctatis, 
hoc subquadrato, 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 granulatis et parce muricato-punctatis, 
versus suturam subseriatim punctatis; humeris subproductis; prosterno postice producto ; femo- 
ribus muticis. Long. ’58. 
Oregon ; Col. 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, subquadrato, 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 perpendiculari, femoribus 
muticis ; tibiis anticis calcari interno duplo longiore. Long. *57— - 65. 
Wenass river to Fort Colville ; Dr. Cooper. Eeadily distinguished by the foregoing char¬ 
acters. By the larger size of the spur of the anterior tibiae, it tends towards E. tricostata , and 
several nondescript species. 
E. cor data. 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 punctured ; the posterior sinuation is therefore much shorter, although the basal angles 
remain rectangular. The other distinctions are as follows : 
1. E. rotundipennis. Thorax very much constricted behind, fully one-half wider than long ; 
elytra as coarsely, but less densely punctured. Length, '45—'55. 
2. E. stricta. Thorax less suddenly, but very much constricted at base, fully one-half 
wider than long ; elytra more coarsely and less densely punctured. Long. '62. 
3. E subligata. Thorax only moderately constricted at base, scarcely wider than long; 
elytra punctured as in E. cordata. Length, - 44. 
Helops Fabr. 
H. Icelus , supra piceo-aeneus pernitidus, capite thoraceque confertim punctatis, hoc lateribus 
fortius marginatis, 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 striae of the 
elytra less convex. 
i 
