124 Mr. G. C. Champion's Revision of the Mexican 



1. Dasytellus imjpressus. 



Listrus impressus, Gorh,, Biol. Centr.-Am., Coleopt., iii, 



2, p. 329 (1886). 

 Dasytellus subovalis, Casey, loc. cit. pp. 565, 570 (1895). 



Hab. United States, Arizona and Texas ; N. Mexico, 

 Sonora. 



The six specimens before me from Sonora include both 

 sexes, the males being narrower than the females and 

 having the fifth ventral segment subtruncate at the tip. 

 The above synonymy has been noticed by Casey (op, cit. 

 ix, p. 682). 



Dasytes. 



Dasytes, PaykuU, Faun. Suec. ii, p. 156 (1798); Gorham, 

 Biol. Centr.-Am., Coleopt. iii, 2, p. 326 (1886) ; Casey, 

 Ann. N. York Acad. Sci. viii, pp. 459, 571 (1895). 



Casey restricts Dasytes, so far as the N. -American forms 

 are concerned, to those species of " Dasytini " which have 

 the anterior tibiae slender and devoid of spinules, the 

 ungual appendages equal, but very short or rudimentary, 

 and the pronotum with a roughly sculptured and abruptly 

 hmited marginal area. He enumerated 14 species nearly 

 all of which are confined to the Pacific Coast region. The 

 more widely distributed D. Jmdsonicus, Lee, extends south- 

 ward to Colorado, Arizona, and Sonora, whence Gorham 

 has recorded it on the strength of numerous specimens sent 

 by Morrison. 



Mecomycter. 



Mecomycter, Horn, Trans. Am. Ent. Soc. x, p. 125 (1882) ; 

 Casey, Ann. N. York Acad. Sci. viii, pp. 459, 595 

 (1895). 



This genus was based upon a single species, from Kansas, 

 with extremely slender, simple, tarsal claws and an elongate 

 head, Casey subsequently adding a second (the type of 

 which was without a head), which he supposed to be from 

 Arizona. A Mexican insect with simple slender claws, 

 included by Gorham under his Listrus coraUijies, must be 

 closely allied to M. facetus, Casey, differing from M. 

 ornalinus, Horn, in having a short head, clavate antennae, 

 etc. 



