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REVISION OF THE TENEBKlONIDyE OF AMERICA, 



The thorax is finely and very sparsely punctured, the elytra coarsely and densely, with a 

 faint tendency to the arrangement of the punctures in lines, more evident in the smoother 

 varieties of the species. Gognata, Hald., is merely a more robust and rather smoother 

 form of extricata. 



Occurs abundantly on the plains of Kansas and Nebraska, and some few have been 

 obtained in Utah and eastern Oregon. 



Length .42-56 inch. 



Group II. 



This group is distinguished readily from the preceding, by having the spurs of the an- 

 terior tibia; very nearly equal in size and in no way differing from each other in thickness 

 and shape. 



Section I. contains the bulk of the species of the group, and may be recognised by the 

 smooth, sparsely punctured thorax. 



The three following species differ from all the others, by having all the femora of each 

 sex armed with a very distinct tooth, large and strong in the first two, small in the Last. 

 The tibiae arc also more strongly curved than in any others of the genus. 



E. militaris, n. sp., black, moderately shining, elongate, similar in form to femorata. Thorax % sub-quadrate, 

 moderately convex, sides rounded, feebly converging at base; apex rather deeply emarginate, angles acute, not denti- 

 form; base feebly rounded, angles not, prominent; J> thorax one-third broader I ban long, more convex at sides, moder- 

 ately rounded, not converging at base; apex as in male, base truncate or feebly rounded, notably broader than apex, 

 angles not. prominent. Elyi ra elongate oval, si rongly attenuate behind, very convex above, with distant rows of rather 

 line and distant punctures. Legs coarsely punctured. 1'ioslernum prolonged, horizontally mucronate. Mesosternuni 

 slightly concave. Length .80-1.00 inch. 



Lower California. Mr. Wm. M. Gabb. 



The sexes of this species differ from each other, in the form of the elytra, the female 

 as usual being the broader and more robust, and also in the form of the thorax. In the 

 % there is scarcely any difference between the thoraces of femorata and militaris, while 

 that of the female of the latter species is much broader, the sides regularly rounded to the 

 basal angles and the base broader near the apex. In both sexes all the femora are armed 

 with a very strong triangular tooth, broader but less acute than armata. This species 

 differs from armata in the character last given, and also in its much less prominent and 

 never dentiform apical thoracic angles. The elytra approach the form of femorata, and 

 are more attenuate behind than in armata. The peculiar form of thorax causes the fe- 

 male to appear more obtuse in front. 



E. armata, Lee., Ann. Lye. 5, 184; Thomson, Arcana I, PI. XII, flg. 2. 



The elytra of this species are less attenuate, rather more suddenly declivous behind 

 than either of the others of the group. The anterior angles of the prothorax are acute, 

 usually prominent and dentiform. Further comparison between this and the preceding 



