378 MEMOIRS ON THE COLEOPTERA 



Aconobius nigripes n. sp. Form much broader and less convex than 

 the preceding, black throughout the body, legs and antennae; pubescence 

 very short, stiff, abundant, obscure grayish in color; head only two-thirds 

 as wide as the prothorax, strongly, very densely punctured; antennae 

 thick, heavy, the last three joints dilated decreasingly to the tip, the 

 third not as long as the next two, the fourth longer than the fifth; pro- 

 thorax a third wider than long, parallel and evenly, feebly arcuate at the 

 sides, the apex barely narrower than the base, both evenly and feebly 

 arcuate from side to side; surface strongly, very densely punctate, the 

 punctures separated by very fine shining intervals, the lateral fringe as 

 usual; elytra oblong, two-thirds longer than wide, arcuately narrowing 

 in apical two-fifths, the sides feebly arcuate, only slightly wider than the 

 prothorax; striae rather coarse, somewhat coarsely but not very closely 

 punctate, the intervals minutely, sparsely punctulate. Length 4.8 mm.; 

 width 1.9 mm. Texas (Marfa), Wickham. 



Easily distinguishable from laciniatus by the less transverse 

 prothorax, with the apex broadly arcuate and not truncate and by 

 the much less impressed elytral striae. 



The genus Aconobius Csy., (Ann. N. Y. Acad. VIII, p. 617) is 

 one of the Blapstinus group of Tenebrionidae. 



ADDENDUM 



The name Exoma, proposed by me for a singular genus of 

 Byrrhids (Can. Ent. 1908, p. 282), proves to be preoccupied by 

 Melichar (1902), as shown by the recent list of Waterhouse and 

 Sharp. In case no other name has been suggested in recent litera- 

 ture to replace it, I would propose the name Exomella, in which 

 case the tribal name would assume the form EXOMELLINI. 



It is rather remarkable that the genus Tyloderma Say, does not 

 appear in any of the published general lists of generic names. I 

 referred to this omission some years ago in the Canadian Ento- 

 mologist. 



