234 SEEEICOENIA. 



Interocular ridge distinctly elevated, nearly entire ; elytra very 

 distinctly striate. 



Proplenral triangle punctate along the inner border only ; 



thorax not very coarsely punctate inutilis. 



Propleural triangle distinctly punctate; thorax coarsely 

 and closely punctate (a pubescent fovea at the apex of 

 the propleural triangle $ , sexual ?) glandifer. 



8. Thorax densely punctate, species opaque ; first joint of the hind 



tarsus shorter than the following joints together opaculus. 



9. Thorax densely punctate, propleural triangle also ; first joint of the 



hind tarsus longer than the following joints together. 



Second joint of the antennae very short, less than half as long 



as the fourth imperitus. 



Second joint of the antennae in its entire length but little 

 shorter than the fourth badius. 



10. Thorax densely punctate and subopaque ; propleural triangle densely 



punctate. 



Claws broadly toothed at the base ; form slender elongatus. 



Claws broader but not toothed; form sub cylindrical . . . . puellus. 



11. Antennas not greatly different in length in the sexes; last ventral 



segment entire <£, or emarginate ? sublucidus. 



1. Plesiofornax pectoralis. 



Oblong, moderately convex, piceous, slightly shining, sparsely clothed with short fulvous pubescence : antennae 

 ferruginous, half ( $ ) or three fourths ( $ ) the length of the body, slender, joint two very small, third 

 with second nearly as long as the first, fourth more than half as long as the third, third to the eleventh 

 gradually longer ; head convex, closely, not roughly punctate, slightly flattened near the clypeus, with a 

 faint longitudinal impression, which extends faintly on the clypeus, this very narrow at the base, less than 

 half the distance to the eye, interocular ridge not elevated ; thorax wider at the base than long, arcuately 

 narrowed to the front, disc convex, a slight punctiform impression each side of the middle of the base, a 

 vague oblique impression each side and a slight median impression near the base, surface closely simply 

 punctate ; elytra parallel for a short distance near the base, then narrowed to the apex, finely striate, 

 intervals rather sparsely and much more finely punctate than the thorax ; prosternum sparsely punctate, 

 propleural triangle very densely punctate even to the thoracic margin ; abdomen more coarsely punctate 

 near the base, more finely and densely towards the apex ; legs piceous, first joint of the hind tarsus shorter 

 than the others together, claws simple. 



Length 7'5-ll-5 millim. 



Hab. Panama, Volcan de Chiriqui 2500 to 4000 feet {Champion). 



The female is of more robust form, and has the frontal impression indistinct, and the 

 antennas shorter and stouter. 



2. Plesiofornax ligniperda. 



Plesiofornax ligniperda, de Bonv. Mon. p. 462, t. 22. fig. 8 \ 



Hab. Mexico, Cordova, Toxpam (Salle l ). — Guiana, Cayenne l . 



