216 SEEEICOENIA. 



to the edge of the clypeus ; antennae brown, ferruginous near the apex ; thorax broader than long, sides 

 parallel for a short distance posteriorly, then arcuately narrowing to the front, surface not closely punctate, 

 the punctuation very sparse at the sides, a faintly impressed, smooth median line posteriorly ; elytra with 

 the sutural stria alone distinct, surface otherwise irregularly punctate, more coarsely but less densely than 

 that of the thorax ; body beneath shining, closely punctate at the sides, pubescent ; legs piceous, tibiae 

 and tarsi paler. 

 Length 5-6 millim. 



Hab. Nicaragua, Chontales (Janson). 



Apparently related to I. muticus, but with a bisinuate clypeus and elytra without 

 striae. The two specimens before me appear to be of different sexes, of which the 

 male is smaller and more attenuate posteriorly. 



PGEC1LOCHRUS. 



Pcecilochrus, de Bonvouloir, Mon. des Eucnemides, p. 148 (1870) . 



This genus differs by very feeble characters from Idiotarsus. The anterior angle of 

 the metasternum has an oblique line, which probably varies in distinctness in the 

 different species, at all events it is quite indistinct in the species described below. 



A renewed examination convinces me that the species described by myself from the 

 North -American region as Stethon errans should be referred to this genus, notwith- 

 standing the fact that both the longitudinal sulcus of the metasternum and the oblique 

 line are quite indistinct. From this we have a wide distribution for the six species — 

 one each from Florida, Nicaragua, Brazil, and Madagascar, and two from Borneo. 



1. Poecilochrus fractus. 



Oblong, cylindrical, moderately convex, slightly narrower behind, brownish, feebly shining, sparsely clothed 

 with cinereous pubescence ; antennae ferruginous, serrate from the fourth joint : head coarsely, not 

 closely, punctate, a faint trace of a smooth median line, clypeus truncate in front ; thorax distinctly wider 

 than long, sides straight and parallel posteriorly, arcuate at the apical third, disc convex, moderately 

 closely, not coarsely, punctate, a faint smooth median line, hind angles broadly rounded ; scutellum oval, 

 truncate at the base ; elytra striate, striae distinctly coarsely punctate at the apical third and along the sides, 

 intervals flat, slightly convex at the apex, moderately closely submuricately punctate at the base, gradually 

 more sparsely towards the apex ; abdomen closely, moderately coarsely punctate ; legs brown. 



Length 8-5 millim. 



Hab. Nicaragua, Chontales [Belt). 



This species is quite distinct from those with non-carinate front, either by the 

 arrangement of the pubescence or by the structure of the antenna?. 



THAMBUS. 



Thambus, de Bonvouloir, Mon. des Eucnemides, p. 160 (1870). 



A genus composed of comparatively small species peculiar to Tropical America, with 

 one exception. It is very closely related to Dromceolus. 



