86 | MALACODERMATA. 
Mas prothoracis margine laterali incisura sat profunda paullo ante angulos posticos ; unguiculis anticis internis, 
intermediis externis basi lobatis, posticis vix fissis. 
Hab. Mexico, Cuernavaca, Durasnal (Sad/é). 
Similar in most of its characters to D. luridum, this species is distinguished by its 
black colour, the front of the head and the reflexed margins of the prothorax being the 
only yellow parts. . 
The elytra are subcostate ; and the antenne (which are about half the body’s length) 
are more compressed and widened from the third to the sixth joint than is usual in 
this genus. 
18. Discodon histrio. (Tab. V. fig. 22, 3.) 
Atrum ; capite prothoraceque nitidis, hoc epistomate flavo-maculato, illo lateribus flavis; elytris subcostatis, 
humeris flavo-guttatis. Long. 9-10 millim. 9. 
Mas prothoracis margine laterali per sulcum obliquum leviter emarginato; unguiculis anticis internis lobatis, 
intermediis et posticis externis fissis. 
Hab. GuateMa.a, Duefias, Capetillo (Champion). 
Head nearly black, with only a few yellow speckles between the antenne ; the latter 
are nearly filiform, only a little thicker from the third to about the fifth joint. The 
thorax is rather small, narrowing a little in front. The discoidal black patch reaches 
from the base so as just to touch the front, where it is narrower. ‘The elytra have a 
very distinct shoulder-stripe of orange colour occupying the raised callus, and three 
raised nervures. The combined effect of these characters is to render this species very 
like a Lycus; and it adopts the pattern so very common among the small Coleoptera of 
the district it inhabits. It is perhaps most close in resemblance to Calopteron 
muimicum. 
The specimen figured is a male from Capetillo. 
19. Discodon difficile. 
Atrum ; epistomate, ore et prothorace albido-flavescentibus. Long. 10-11 millim. <6 9. 
Mas prothoracis margine laterali infra medium tenuissime oblique inciso; unguiculis anticis internis basi 
lobatis, intermediis et posticis externis basi incrassatis, haud fissis. 
Hab. Mexico, Juquila (Boucard, coll. Sallé), Guanajuato (Dugeés, coll. Saillé). 
Extremely like D. flavicolle ; but, in addition to the male not having the middle or 
hind claws split, the scutellum is black, the thorax is more transverse and not so much 
rounded in front, its disk is mottled with darker yellow spots, and its margins are not 
reflexed, nor with a basal deeply impressed line. The elytra are subrugose, and not 
shining as they often are in D. flavicolle. 
I have only seen two male and one female specimen at present. 
