various Central American Coleoptera. 669 
Hab. W. Mexico, Acapulco (Hége). 
Onespecimen. This peculiar form must be nearly related 
to T. sellata, Horn, from Lower California [redescribed by 
Fall, in Trans. Am. Ent. Soc., xxxi, p. 175 (1905)], which 
has more numerous tufts of blackish hairs on the elytra 
(the one enclosed within the discoidal patch being probably 
more developed in the present species), and a tuft of short 
stiff brown hairs on the dorsal hump of the prothorax, 
this latter being absent in 7’. discigera. 
Trichodesma convexa, 0. sp. 
Elongate, broad, robust; piceous, the antennae and the tips of 
the tarsi obscure ferruginous; variegated with brown, fulvous, and 
white pubescence, the white pubescence condensed into a transverse 
streak on each side of the depressed basal portion of the prothorax, 
and a narrow, interrupted, angulate, median fascia and a few small 
scattered spots on the elytra, the alternate interstices of the latter 
here and there set with dense oblong patches of slightly longer, 
semierect, dark brown hairs, the legs and antennae with long pro- 
jecting hairs. Head densely punctulate and subgranulate, broadly 
hollowed down the middle; antennae moderately long, joints 4-8 
small, subequal in length, 5 and 7 a little wider than 6 and 8, the 
dilated joints 9-11 long, 9 as long as 4-8 united. Prothorax broad, 
as wide as the elytra, the sides arcuate before the middle and 
obliquely, sinuously converging behind, the hind angles obliterated ; 
finely granulate, the dorsal hump moderately developed, arcuate 
as seen in profile, and arising from near the base. Elytra long, 
convex, subparallel, the apices broadly produced and abruptly 
truncate, the humeri somewhat obtuse; rather coarsely punctate- 
striate, the interstices moderately convex, densely punctulate, and 
sparsely, finely granulate. 
Length 63, breadth 3 mm. (9) 
Hab. W. Mexico, Acapulco (Hége). 
One specimen. The very broad prothorax, with rounded 
dorsal hump, the broadly produced, abruptly truncate 
apices of the elytra, and the absence of the usual long 
erect villosity from the upper surface of the body, give 
this insect a very different facies from most of the de- 
scribed species of T'richodesma. The Guatemalan 7. trun- 
cata, Ch. (antea, p. 138), is, however, intermediate in this 
respect, and, like T. convexa, has a rather large, pentagonal, 
sharply margined mesosternal process, which is received in 
