MECYNOTARSUS.—TOMODERUWS. 215 
1. Mecynotarsus sexnotatus. (Tab. IX. figg. 25, 25a.) 
Bronze-black, rather shining; the head clothed with silvery-white pubescence and with numerous very long, 
coarse, erect hairs at the sides and in front; the prothorax clothed with brownish pubescence on the disc 
and coarser silvery-white scale-like pubescence at the sides, the sides with two or three long erect hairs ; 
elytra each with a large oblong lateral patch of coarse silvery-white scale-like pubescence below the 
shoulder, a smaller patch a little below the middle, and a still smaller one close to the suture at the apex, 
for the rest sparsely clothed with fine brown pubescence.. Head densely and minutely punctured, broadly 
longitudinally depressed in the middle in front; antenne slender, piceous-brown; prothorax globose, 
nearly as long as broad, thickly and finely punctured—the horn moderately large, wider in the female than 
in the male, very coarsely tridentate on each side, and with a strong blunt tooth at the apex, the crest 
long and narrow, very little elevated, strongly margined to the apex, the margins serrulate ; elytra oval, 
densely and coarsely punctured (the punctuation much coarser than that of the head or prothorax), the 
humeri distinct but obtuse, the apices obtuse and slightly divergent in the male, more rounded in the female ; 
legs testaceous or fusco-testaceous, the femora in great part piceous; beneath piceous’or piceous-brown, 
opaque, densely and finely punctured, thickly clothed with coarse whitish pubescence; fifth ventral 
segment depressed in the middle and emarginate at the apex in the male. 
Length 13-2 millim. (¢ 9.) 
Hab. GuateMata, Champerico (Champion). 
Found in profusion on the sea-beach at Champerico on the Pacific coast. Allied to 
M. elegans, Lec., from Florida, but with very differently arranged pubescence on the 
elytra. The elytra are coarsely punctured, and have three lateral patches of coarse 
silvery-white scale-like pubescence; the thoracic horn is coarsely tridentate on each 
side, and has a coarse blunt tooth at the apex; the head is longitudinally depressed 
and furnished with numerous long, coarse, erect hairs at the sides and in front. 
Certain Australian species somewhat closely resemble WM. seanotatus. 
TOMODERUS. 
Tomoderus,; La Ferté, Monogr. Anthic. p. 94 (1848); Lacordaire, Gen. Col. v. p. 593. 
Of the sixteen described species of Tomoderus, five only are from the New World— 
two from the United States and three from Colombia. The genus is represented in 
Central America by seven species, all of which are apparently new; two of these are 
of very small size, less than 2 millim. in length. In a rather large undescribed species 
from Colombia, of which a single example is contained in Mr. F. Bates’s collection, 
labelled ZTomoderus pallidicornis, Schauf., the shoulders of the elytra are completely 
effaced (the elytra, in consequence, being more ovate) and the body is apterous; this 
insect is, perhaps, generically distinct from Tomoderus. 
The Central-American species may be tabulated thus :— 
Prothorax deeply canaliculate ; species comparatively large. 
Elytra with a large and deep post-basal depression. . . . . = + + excavatus. 
Elytra with a very shallow post-basal depression . . » + « « « canaliculatus. 
Prothorax at most obsoletely or very finely canaliculate (the groove some- 
times confined to the constricted part); species smaller. 
Elytra with a large deep post-basal depression extending outwards to the oe 
humeri; basal joints of antenne slender and moderately moniliform . complanatus. 
