80 MALACODERMATA. 
base of the femora yellow. The pygidial plate is strongly dome-shaped, with its margin 
reflexed so as to meet the bifid ventral segment which closes the anal aperture. This 
structure is not so much developed in D. plicatum, where the pygidium is flatter. In 
the female the apical ventral plate is broad and angularly notched on each side of the 
middle, the thorax is wider behind than in front; the sides are only very slightly 
sinuate; and this sex may, of course, be distinguished by the claws being all simple. 
The specimens from Cerro Zunil have the sides of the thorax in the male with a 
wider and deeper excision ; the elytra have the middle of their margins narrowly black ; 
and the legs are paler. 
4, Discodon nigripes. 
Nigrum ; capite, prothorace, scutello elytrisque flavis. Long. 93-11 millim. dQ. 
Hab. Guatemata, Las Mercedes (Champion). 
Head yellow, a little clouded above, shining ; antenne and palpi black; tips of the 
mandibles pitchy. Thorax shining, disk uneven; lateral notch in the: male small, 
obliquely directed forwards in the middle; the margin in the female only a little sinuate. 
Mesosternum yellow. Legs, postpectus, and abdomen black. Pygidium of the male a 
little convex ; apical ventral segment of the female rounded, not notched at the apex. 
5. Discodon carbonarium. 
Atrum ; capite et prothorace nitidis, ore obscure piceo. Long. 8-8} millim. ¢ Q. 
Mas prothorace medio lateraliter constricto, segmento apicali ventrali fisso. 
Hab. GuateMata, Quiche Mountains (Champion). 
The almost totally black colour of this species will distinguish it from any other of 
the genus except D. melancholicum, the only parts which are not black being the mouth, 
which is obscurely pitchy, and the membranous portions exposed between the prosternum 
and breast, which are yellowish. The head, as in many of the species of the genus, is 
more contracted behind in the male than in the female; but the thorax covers nearly all 
but the crown. The constriction of the thorax in the male is similar to that of D. inciswm 
and D. marginatum, in which the margin is not distinctly notched. 
About eight specimens, of which two are males, have been captured by Mr. 
Champion. 
6. Discodon marginatum. 
Testaceum, subnitidum; prothorace disco infuscato, foveola lata impresso; elytris fusco-piceis, marginibus, 
sutura strigaque humerali rufis; antennis fuscis, articulo primo rufo. Long. 10 millim. ¢ 9. 
Mas prothoracis limbo laterali ante angulos posticos contracto vix edentato, segmento apicali ventrali fisso. 
Hab. Guatemaua, Calderas, Duefias, San Gerdénimo (Champion). 
Easily separable by its colour from any other of the genus, and also differing in being 
of a soft texture, as shown by the shallow depression in the centre of the thorax, which 
