MALACODERMATA. 281 
The mouth and the tips of the mandibles are black. The thorax has a very distinct 
M-like mark. The specimen, which is a male, has the terminal convex segment fuscous. 
22 (ps). Chauliognathus corvinus. 
Ater, subopacus ; capite parum nitido, mandibulis prothoracisque lateribus flavis. Long. 7-10 millim. ¢ 9. 
Var. a. Elytris sordide flavis, apice nigris. 
Hab. Guaremata, San Isidro (Champion); Nicaracua, Chontales (Belt, Janson) ; 
Costa Rica, Cache (Rogers) ; Panama, Bugaba, Boquete, Volcan de Chiriqui (Champion). 
Allied to C. apicalis, but the elytra are not abbreviated as in that species, and usually 
wholly black in colour. In the variety with pale ochraceous elytra the degree to which 
the black extends at the apex varies, it being sometimes only the extreme apical margin 
which is fuscous, at others about one third of their length at the apex which is black. 
The lateral margin is very rarely pale; of about two dozen specimens with black elytra 
only one from Chiriqui is thus margined. The antenne are shortish and compressed ; 
the head black, but yellow in front of the eyes at the origin of the antenne. The legs 
and underside are wholly black, with the sole exception of the membranous exposed 
portions of the thorax and the bases of the trochanters and tips of the coxe. 
I have found males of both colour-forms; the apical convex, or valvular, segment is 
black and shining. 
Chauliognathus histrio (p. 75). 
To the localities given, add :—Muxico (flohr), Cordova, Jalapa, Playa Vicente (Hage), 
Presidio, Ventanas (Forrer). 
23 (a). Chauliognathus obliquus. (Tab. XII. fig. 15.) 
Flavo-testaceus ; occipite, femoribus apice, tibiis tarsisque nigris; antennis, palpis elytrisque fuscis, his vitta 
obliqua et de humero ad apicem flava; elytris abbreviatis; alis fuscis. Long. 9-10 millim. ¢ 9. 
Hab. Mexico, Cerro de Plumas (Hége). 
Head yellow beneath; crown as far as the eyes, and also the cheeks, black; mouth, 
antenne, and palpi fuscous; antenne moderately long (7. ¢. two thirds of the body’s 
length), thin, and with the fourth to the last joints subequal and longer than the second 
and third taken together. Thorax with the sides subparallel, sometimes narrowing a 
little to the base, sometimes a little orbiculate, almost quadrate; there is a considerable 
depression on the hinder part of the disc, which is often contracted into a sulcus. 
Scutellum fuscous and with a yellowish tip, or yellowish. The elytra are fuscous, with 
a broad yellow stripe from the shoulder, which it entirely includes, running obliquely 
to the suture just before the apex, which is itself yellow. Wings fuscous. The male 
has the ventral valvular plate of the same yellow colour as the rest of the body. 
A considerable series taken by Herr Hoge. 
BIOL. CENTR.-AMER., Coleopt., Vol. III. Pt. 2, March 1885. 20 
