72 MALACODERMATA. 
and appendages are black. It is, however, variable. The breast and base of the 
thighs and coxe are red in some examples. The black on the thorax varies from the 
entire disk to three spots arranged transversely in a row, and that on the elytra from 
two large spots to an entire fascia, while in one example the apical third is black, with 
a minute red spot at the sutural angle. 
The valvular plate of the male is always black. Two examples from Sturm’s collec- 
tion have the elytra entirely red. 
12. Chauliognathus signatus. 
Chauliognathus distinguendus, var.?, C. Waterh. Trans. Ent. Soc. 1878, p. 328. 
Callianthia signata (Sturm coll.). 
Niger ; C. togato latior et preesertim brevior; prothorace elytrisque pallide flavis, his. basi et macula magna 
rotunda pone medium nigris, illo punctis tribus ; abdominis segmentis flavo marginatis. Long.17millim. °. 
Hab. Mexico (coll. Sturm). 
The different form and colour, and the black base of the elytra and differently 
coloured abdomen, indicate a distinct species from C. togatus, to which it is allied. It 
is very near to C. distinguendus, var.?, Waterh. The number of spots on the thorax 
seems liable to vary: one specimen has only two. 
13. Chauliognathus nigrocinctus. (Tab. V. fig. 12.) 
Niger ; ore, abdomine (segmentis basi nigris), metasterni pleuris et thorace flavis ; elytris stramineis, his fascia 
tenui, illo macula discoidali transversa nigris. Long. 13-15 millim. g¢ 9. 
Var. elytris basi nigris (coll. Sturm, @ ). 
Hab. Mexico, Guanajuato (Duges, coll. Sallé). 
The larger examples of this species only equal in size the smaller of C. togatus. It 
is of the same parallel form as that ; and the thorax isof similar shape. The transverse 
mark on the disk is not separated into spots in any one of the six specimens before me; 
but in the variety there is a punctiform spot at each end of it. 
The valvular plate in the male is blackish at the base, fading into testaceous at the 
apex. ‘The abdominal ventral plates are yellow, with black bases. The antenne are 
inserted in yellow spots; and the mandibles are yellow. 
14. Chauliognathus bilineatus. (Tab. V. fig. 13.) 
Flavus; capitis basi et macula transversa occipitali, prothorace lineis duabus, elytris puncto pone medium, 
antennis, palpis, parapleuris, segmentis ventralibus singulis maculis quatuor, tibiis tarsisque nigris, 
Long. 17-19 millim. 9°. 
Var. abdomine segmentis ventralibus immaculatis, puncto elytrorum majore. Long.14 millim. g. 
Hab. Mexico (coll. Sturm). 
This species may be well recognized by its elongate form and general ochraceous- 
. yellow colour. The yellow head with only the gular portion and a curved mark between 
