320 



REVISION OF THE TENEWUONIDJE OF AMERICA, 



T). mavginata, Esch., (Eleodes) Zool. Atl. 3, 10; Mann. Beitrag. 289. Macheri, Mann,, Rev. Zool. 1840, p. 

 187; Beitrag. 800. Lea (Discogenla) New Species, 117. 



The thorax is broader than long, strongly rounded on the sides and finely margined, 

 and with the hind angles not prominent; anteriorly feebly emarginate angles obtuse. 

 The elytra arc oval, rather pointed behind, and scarcely wider than the thorax, the hu- 

 meral angles are obtuse. The anterior femora of the male are armed with an obtuse 

 tooth, the femora of the female are mutic. 



Occurs not abundantly in the region surrounding the Bay of San Francisco. 



Length .56— .82 inch. 



D. seabrieula, Leo., (Eleodes) Proc. Acad. 1858, p. 1ST; (Discogenla) New Species, p. 117. 



Tins species is more robust, much more rugosely sculptured, and differs especially in 



the anterior femora of the female being armed with an obtuse tooth. 



Length .7(5 inch. 



EMBAlMIIOX, Say. 



Embaphion, Say, Journ. Acad. 8, p. 351!; Lacordaire Genera V., p. 152. 



This genus is separated from Eleodes by rather feeble characters. The epipleunc arc 

 always narrow, the suture rarely visible except at apex, at base scarcely and not suddenly 

 wider, never attaining the humeral angles of elytra. The anterior tibia; at base arc very 

 distinctly sinuate in the males, less in the females. The thorax and elytra, arc; always 

 acutely, sometimes broadly, margined; the elytral margin more or less distinctly reflexed. 

 The mentum is trilobed, the middle lobe broad, rounded in front, the Lateral lobes small 



and inflexed. 



E. murieatum, Say, Journ. Acad. 8, 251; concavum, Lee., Proc. Acad. VI, p. 440; Thomson, Arcana 1, pi. 

 xii, lig. 10. 



This species may be readily distinguished from the others of the genus by the very 

 broad foliaceous margin of the thorax and elytra, very strongly reflexed. The elytral 

 margin extends beyond the apex and the two meet on a line with the suture. The thor- 

 acic margin is broad and widens behind, so that the hind angles are prominent, sub-acute, 

 and project backwards over the basal angles of the elytra. The thorax itself (less the 

 margins) is narrow, longer than broad, and about equal to half the width of the; elytra 

 (without margin). The disc of elytra (without margin) is elongate oval, the humeral 

 angles not prominent and are rounded. The angles formed by the margin, arc; nearly 

 right. The base of the thorax is strongly trisinuate ; the base of the thorax proper be- 

 ing rounded, that of the margin on each side emarginate. The; base of elytra is emargin- 

 ate at middle, and on each side broadly rounded. Concavum, Lee:., is merely a large 

 form with more strongly reflexed margins. The elytra of both forms are sculptured with 

 approximate series of fine punctures, each bearing a short hair. 



Occurs rather abundantly from Kansas to Texas. 



Length .50— .7(5 inch. 



