372 CASEY 



arcuate, the apex rather gradually ogival, the punctures somewhat 

 fine, sparse, uniform in size, for the most part confused but with 

 poorly defined series evident under close examination ; metasternum 

 and parapleurtE throughout only moderately coarsely, though 

 strongly and sparsely punctate, the abdomen minutely and sparsely 

 so, only slightly less finely toward the sides. Length 7.0—7.7 

 mm. ; width 3.2-3.35 mm. Texas (near El Paso). 



amplipenne n. sp. 



The description of helopioides is taken from the original diag- 

 nosis of Horn, and there seems to be but little room to doubt 

 the specific distinctness of aniplipciinc, in view of the differ- 

 ences in the form of the anterior angles of the prothorax, punc- 

 tuation of the head and sterna, coloration and habitat. 



Chilometopon Horn. 



In this genus, which is characterized by a smaller and slighter 

 form of body, the mandibles differ greatly from those of Pro- 

 metopion, being less stout, with a fine external dorsal ridge den- 

 tiformly swollen at base and similarly clasping the epistomal 

 lobe, which has the sides more converging and the apex more 

 rounded. The apex of the mandibles is much narrower and is 

 deeply bifid, the two lobes differing but little in size and both 

 acutely pointed. It further differs in the form of the prothorax 

 and in the elongate terminal joint of the antenna. The scutellum 

 is similar though more subquadrate, rounded behind and enter- 

 ing sensibly between the elytra. The eyes are similarly large, 

 prominent and very feebly emarginate, and the supra-orbital 

 carina is fine but distinct ; the tarsal claws are similarly long and 

 arcuate. We have apparently five species, which may be dis- 

 tinguished as follows : — 



Basal joint of the hind tarsi very elongate, equal to the last two com- 

 bined ; epistomal lobe rounded , 2 



Basal joint but little longer than the fourth, the epistomal lobe abruptly 

 arcuato-truncate 4 



2 — Head rather coarsely and densely punctured. Body chestnut- 

 brown in color, subopaque, last antennal joint as long as the two 

 preceding together; prothorax broader than long, narrower at 

 base than at apex and narrower than the base of the elytra, the 

 disk moderately convex, coarsely and moderately densely punc- 

 tured, especially toward the margins, the apex feebly emarginate, 

 the base slightly sinuate [bisinuate], the sides rounded in front, 



