138 
INSECTA SAUNDERSIANA. 
which it has no other affinity than the tenuity of the antennae. The 
peculiar structure of the posterior carina of the thorax, projected in an 
arch from the posterior angles to the middle, where it is very distant from 
the base (instead of being concave, or at least very near to the base in the 
middle, and more distant from it at the sides, as it generally is in that 
family), combined with its other characters, does not permit its interca¬ 
lation amongst the established genera. 
Two closely allied species (to which will doubtless be added others 
unknown to me) make this genus a homogeneous group. 
Camptotropis gracilicornis (Dejean). 
Ovatus , convexus , niger , fusco tomentosus ; aniennis rujis ; corpore toto 
pedibusque fulvo autjlavo irroratis ; rostro la to, evidenter transverse , 
deplanato , basi utrinque supra oculos transversim impresso ; oculis 
sat magnis ; thorace transverso , subconico , angulis posticis acutis , 
versus extraque elytra productis , carina postica regulariter convexo- 
arcuata , medio basis distante , cum angulis posticis juncta ; elytris 
basi singulatim obtuse rotundatis , versus medium paullo ampliatis , 
punctato-striatis , sutura interstitiisque alternis elevatis , nigro ful- 
voque tessellatis , intra basin prope suturam callo duplici longitudi- 
nali instructis. 
$ Antennis crassioribus longioribusque , medium elytrorum superantibus 
clava elongata , articulis disjunctis , duobus primis triangularibus , 
ultimo ovato-acuto. 
9 Antennis tenuioribus brevioribusque , basin elytrorum baud superanti¬ 
bus ; clava ut in $, sed paullo minore. 
Longit. (cap. infl.) 2^—3 lin. = 5—7 millim. 
Latit. infr. med. elytr. 1^— 1% lin. — 2^—3 T S 5 millim. 
Synon. : Corrhecerus gracilicornis , Dej. in litt. 
Patria : Cayenna, Dom. Dupont : Para, Dom. Parzudaki. 
This species, of the size of Crat. luridus , but varying to only half the 
size, is, proportionally, much shorter, broader, thicker and more convex. 
It closely resembles in the general shape of the body and antennae 
Brachytarsus varius, F. and Arceocerus coffece , F. 
Head short, transverse, immersed to the eyes, punctate-rugulose, 
