DISCODON. 85 
In the male the ségment preceding the apical one is angularly emarginate, the apical 
cleft (as it is, indeed, in all species of Discodon) not much raised. The absence of fission 
in the hind claw is not of generic importance, being but a secondary character ; but it 
will, I think, indicate a separate section. ‘The inner point where the claw appears to 
be divided is, I think, an independent structure, analogous to the “ membranous lobe ” 
on the front or middle pair, which is sometimes of a tooth-like shape, and reaches in 
some cases near to the tip of the claw. 
The figure represents a female from San Geronimo. 
15. Discodon dubium. 
Nigro-fuscum ; capite nigro, epistomate flavo ; prothorace flavo macula oblonga vel disco toto nigro-piceo ; 
elytrorum marginibus et sutura abdominisque margine tenuiter flavis. Long. 9-11 millim. dQ. 
Mas prothoracis margine laterali infra medium incisura tenui sat profunde fere recta; unguiculis posticis 
externis fissis. 
Hab. Mexico, Oaxaca, Juquila (Boucard, coll. Sallé). 
The principal points in which this species shows any difference from D. photinoides 
(apart from the male characters) are that the thorax is not so evenly convex and the 
discoidal patch is rather of an oblong shape. The abdomen is margined ; and sometimes 
the angularly excised subapical plate has its apical margin whitish yellow. 
16. Discodon luridum. 
Nigro-fuscum ; capite, antennis, tibiis tarsisque nigris, epistomate flavo ; prothorace et elytris sordide flavis, 
his amplis, illo disco piceo; abdominis margine et maris segmento apicali pallidis, Long. 11-12 millim. 
dQ. 
Mas prothoracis margine laterali incisura sat profunda paullo ante angulos posticos; unguiculis externis basi 
lobatis, posticis vix fissis. 
Hab. Mexico, Juquila (Boucard, coll. Sallé, Hoge). 
The section to which this species belongs have the elytra soft, considerably widened 
below the middle, and generally shrivelled in drying; but their form is quite recogni- 
zable. ‘The females have the elytra as wide as the males. The external claws of the 
male in D. luridum are all furnished with the usual membrane at their base; but in 
the hinder pair this projects as a tooth-like plate nearly to the length of the claw; 
thus the claw when viewed from its back appears bifid. ‘The present species is easily 
recognized by its brownish-yellow elytra and pale yellow thorax, with a broad pitchy- 
black vitta, narrowing towards and not often meeting the front margin. 
The apical ventral plate in the male has its two lobes inclined to each other, and 
much raised where they meet at the apex. 
17. Discodon lugubre. 
Aterrimum, opacum ; elytris amplis; capitis fronte prothoracisque epipleuris lete flavis; antennis basi lati- 
usculis serratis, ad apicem attenuatis. Long. 10-12 millim. ¢ 9. 
