216 HETEROMERA. 
Elytra with a small deep post-basal depression close to the suture; basal 
joints of antennz stout and strongly moniliform. . . . . . monilicornis. 
Elytra with a very shallow post-basal depression (sometimes chsplete), 
coarsely punctured on the basal half. 
Antenne moderately stout, brownish, with the basal and apical joints 
testaceous; size moderate .. . ois ye . oe «© «~ brevicornis. 
Antenne slender, piceous, with the apical saint nsully testaceous ; 
size verysmall . . . 1... . : : ; exiguus. 
Elytra regularly convex, without post-basal denrcinil very finely sind 
sparsely punctured on the basal half; antennz with the intermediate 
joints usually infuscate and the apical three or four yellowish ; 
size verysmall . . 2. . 1. 1 1 ew ee we ew ee we revi. 
1. Tomoderus excavatus. (Tab. IX. tig. 26, 2.) 
Short, broad, convex, shining, dark reddish-brown, the elytra (except at the base and apex) piceous or piceous- 
brown; the head and prothorax very sparsely pubescent, the elytra somewhat thickly clothed with longer 
and coarser semierect fulvous hairs. Head transverse, large, smooth, the eyes small and not prominent ; 
antenne rather short, moderately stout, widening outwardly, joints 9 and 10 strongly transverse and 
broader than 8, 11 about twice as long as 10, ovate, acuminate, 1 and 2 ferruginous, 3-8 black, 9-11 
testaceous ; prothorax narrower than the head, one half longer than broad, smooth, very strongly 
constricted behind the middle (the posterior portion nearly as wide at the base as the anterior portion), 
the disc longitudinally suleate (deeply so on the posterior portion, more finely and shallowly so on the 
anterior portion, the groove on the latter confined to the most elevated part, and not extending to the 
apex); elytra broad and short, more than twice as wide as the prothorax, rather obtuse behind, a little 
dilated at the sides about the middle, each with a large and deep transverse or oblique depression on the 
disc below the base, and irregular rows of somewhat distantly placed punctures, the punctures coarser 
and distinct at the base, fine and shallow beyond the basal depression, and becoming very faint’towards _ 
the apex; beneath piceous; legs testaceous or fusco-testaceous, the femora darker in the middle, the latter 
moderately clavate. 
Length 23 millim. (92.) 
Hab. Guatemala, Chiacam and Senahu in Vera Paz (Champion). 
Two examples, both females. Allied to the Colombian 7. signaticornis, La Ferté ; 
but differing from it in the very deep post-basal depression (transverse in one example, 
oblique in the other) of the elytra, and in the deeper longitudinal sulcature of the 
posterior part of the thorax. The antenne are very similarly coloured. 
2. Tomoderus canaliculatus. 
Short, broad, convex, shining, pale castaneous, the elytra lighter at the apex, the head and prothorax very 
sparsely pubescent, the elytra thickly clothed with longer and coarser semierect fulvous hairs. Head and 
antenne almost as in 7’. excavatus, the antenne with joints 1 and 2 testaceous, 3-8 piceous-brown, and 
9-11 flavo-testaceous ; prothorax very much as in 7’. excavatus, but with the longitudinal median groove 
deep on both the anterior and the posterior portions (the groove on the anterior portion deeper and longer 
than in 7. excavatus, but not reaching the apex); elytra longer than in 7. excavatus, a little dilated at the 
sides before the middle, with only a very shallow transverse depression on the disc below the base, the 
punctuation fine and shallow (much finer at the base than in 7’. ewcavatus), becoming almost obsolete 
behind, the punctures forming irregular rows; beneath reddish-brown, the last two ventral segments 
