288 



REVISION OF THE TENEBRIONID.E OF AMERICA, 



oval, broader behind the middle, moderately convex and gradually declivous behind, the 

 base is feebly emarginate, angles not prominent. From Arizona, and New Mexico. 

 Length .85 inch. 



A. o bo vat a, (Euschides) Leo., Aim. Lye. V. 127. 



Differs from the preceding in having the elytra much more broadly expanded behind 

 the middle, with acute rather prominent angles. The margin of the elytra is rounded and 

 indistinct. It is probable that future discoveries will unite the preceding species with 

 this one. 



Length .85 inch. 



A. c on vexicoll is , (Euschidss) Leo., Proc. Acad. 7, 324. 



Differs from both the preceding species in the very narrow thoracic margin, and by 

 the greater convexity of the thorax, as well as the less breadth, as compared with the 

 length. The elytra are similar to those of convexa, and has distinct though not prominent 

 humeral angles. 



Ilathcr common in Arizona. 



A. mar gin at a, (Pelecyph.) Lee, Ann. Lye. V. 128; rimatus, Lee., Proc. Acad. 7, 221!; Philolitlms rimatus, 

 Lac. Genera V. 158. 



One of our largest and at the same time a very variable species. 



Three varieties may be more especially noticed : 



Marginata, surface sparsely and rather finely punctured, thoracic margin less strongly 

 punctured and crenulate. Elytra with an acute margin not extending to the apex. 



Birnata, surface of elytra very coarsely and deeply punctured, thoracic margin very 

 strongly punctured and crenulate, disc convex. Marginal line of elytra acute and extend- 

 ing usually beyond three-fourths of their length. As compared with marglnahis this spe- 

 cies is broader, and the elytra broader and less convex. 



Subcylindrica, thorax as in rimataj elytra elongate, strongly rounded on the sides, 

 sub-cylindrical and with a very short humeral carina; surface smooth, very finely 

 punctured. 



In all these forms the thorax is broader than long, sides strongly rounded and with a 

 flattened margin more or less crenulate. The disc is convex. The base is broadly lobed 

 at middle and with a broad impression opposite the seutellum. 



All these forms inhabit the desert regions bordering the Gila River of Arizona. 



Length 1.00-1.20 inch. 



A. gibbicollis, Mock, sub-opaque. Thorax broader than long, strongly gibbons, margin broad, thickened 

 and ivllexcd in front, gradually narrowing to base, apex deeply emarginate, angles acute, base rounded, and with 

 three deep impressions, one scntellar and one on eacli side; elytra broadly oval, marginal carina distinct, base trun- 

 cate, angles distinct. Length .85-1.00 inch. 



A very distinct species, recalling the form of some of the Microschatiic by the strong 



