CONOTRACHELUS. 343 
r’, Elytra with the alternate interstices more or less costate, the inner 
cost becoming evanescent anteriorly . . . . . . . . . Species 166-169. 
E. Meso- and metasternum deeply depressed down the middle, the cavity 
well-defined, punctate or smooth, and usually ending in the anterior 
part of the metasternum. 
. Elytra with obtuse or rounded humeri. 
s’. Elytra with the alternate interstices costate, the costz sometimes 
interrupted, the other interstices not raised at the apex; pro- 
thorax with or without small smooth prominences on the disc. 
‘A’, The costz on the seventh and ninth interstices produced into a 
spine at the apex. 2 2... ww es Species 170. 
i. The costa not produced at the apex . . . . ; . Species 171-185. 
’. Elytra with the alternate interstices throughout, and the others 
towards the apex, costate ; prothorax without tubercles. . . . Species 186. 
m. Elytra with dentiform humeri, the alternate interstices sharply 
costate; prothorax quadrituberculate . . . . . . . . . . Species 187. 
If. Femora unarmed; mesosternum declivous, with a stout compressed 
prominence on each side in front ; elytra with the alternate interstices 
feebly raised . 2... ee eee ee ee. Species 188. 
1. Conotrachelus quadridens, sp.n. (Tab. XVIII. fige. 1,14, 9; 14, anterior 
femur; 1, posterior femur.) 
Oblong-ovate, moderately shining, piceous, the legs and rostrum partly reddish; the vestiture long, coarse, 
and rather close, mostly brownish or ochreous in colour, with a little white intermixed, the white scales 
condensed into a narrow curved vitta on each side of the disc of the prothorax, divided into two behind, 
a small space on the humeri in front, and a large, common, transverse, anteriorly excised, dense patch on 
the disc of the elytra at about one-third from the apex, the femora also with a white ring beyond the 
middle. Head closely punctate, faintly foveate between the eyes ; rostrum slender, nearly twice as long 
as the prothorax, feebly curved, shallowly grooved towards the base, for the rest smooth and shining, 
the antenne inserted at the middle, joints 1 and 2 of the funiculus elongate, subequal. Prothorax much 
broader than long, laterally compressed and abruptly narrowed in front, strongly bisinuate at the base; 
closely, finely punctate, and with a smooth raised median line anteriorly. Elytra compressed at the 
sides below the rounded humeri, arcuately narrowing from about the basal third; coarsely seriate- 
punctate, the interstices rather broad, rugulose, 3, 5, 7, and 9 costate, the ridge on 3 twice, and that on 
5 and 7 once, broadly, abruptly interrupted. Mesosternum narrow and flattened between the coxa, 
obsoletely bituberculate in front. Metasternum with a sharp tooth-like prominence on each side in front 
of the posterior coxe. Ventral segments shining, very sparsely, finely punctate. Femora clavate, each 
with a large triangular tooth, that of the anterior and intermediate pairs with two small, and that of the 
posterior pair with three longer, additional teeth on its outer edge. Tibie strongly sinuate. Tarsal 
claws with a long tooth. 
Length 53-6, breadth 3 millim. (9.) 
Hab. Panama, Volcan de Chiriqui 4000 feet (Champion). 
Two specimens. This is one of the two Central-American Conotracheli with four 
conspicuous teeth on the posterior femora. The elytra have a large, common, 
transverse, dense patch of white scales towards the apex, a character to be found in 
various other members of the genus. 
