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



Hah. Mexico, Monclova in Coahuila {Dr. Palmer). 



Two females, quoted by Gorham in his Supplement 

 under T. nigroaeneus, to which the present species bears 

 no resemblance. The small head, campanulate prothorax, 

 and posteriorly widened elytra, separate T. conicus at once 

 from the females of all the other Mexican species of the 

 genus known to me; the male may be differently shaped. 

 The vestiture, too, though coarse, is wholly decumbent. 



29. Trichochrous fernigineus. 



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



2, p. 330 (1886). 

 Trichochrous exiguus, Casey, Ann. N. York Acad. Sci. viii, 



pp. 470, 497 (1895). 



(^. Anterior and intermediate tibiae armed with a short, stout, 

 blunt tooth at the inner apical angle ; fifth ventral segment broadly 

 truncate at the apex. 



Hah. United States, Arizona; Mexico, N. Sonora. 



A very small, Cryptophagiform insect, ferruginous in 

 colour, with the head often broadly infuscate in the middle 

 behind, the metasternum, and sometimes the abdomen also, 

 and the tip of the antennae, black. The elytra are much 

 broader than the prothorax in both sexes. The vestiture 

 is wholly decumbent and flavescent, and the marginal 

 ciha are long. The antennae are short, with joints 5-10 

 serrate, and transverse, 5 slightly larger than 6, and 9 and 

 10 much wider than those preceding. The tibiae are very 

 feebly spinulose (when seen under the microscope), and 

 the species is therefore not a true Listrus. Casey (op. cit. 

 ix. p. 682) has already called attention to the synonymy. 

 Three males and four females have been seen by me from 

 Sonora. 



Listrus. 



Listrus, Motschulsky, Bull. Mosc. iv. p. 389 (1859) ; Gorham, 



Biol. Centr.-Am., Coleopt. iii, 2, pp. 125 (1882), 



329 (1886); Casey, Ann. N. York Acad. Sci. viii, 



pp. 458, 540. 



Thirty-two species of this genus are enumerated by 



Casey from N, America, one only of which is known to me 



from south of the Mexican border. L. impressus, Gorh., 



is here referred to Dasytellus, and L. ferrugineus, Gorh., 



to Trichochrous. The sixteen forms now recorded from 



