340 RHYNCHOPHORA. 
have been described from South America, but this can only be proved by comparison 
of the types *, 
I. Femora dentate (the anterior pair unarmed in C. curvimanus, &c.). 
A. Mesosternum feebly convex, flattened, or slightly declivous between the 
intermediate coxe, the sides often thickened or tuberculate in front 
and the median portion somewhat hollowed +. 
. Posterior femora quadridentate, the others bi- or tridentate. 
6. Posterior femora tridentate, the others bidentate . woe ee 
. Posterior femora with a large irregularly serrate tooth, the others 
bidentate . . we toe ee . 
d. All the femora bidentate, the i inner larger tooth sinuato- truncate . 
e. All the femora bi- or unidentate, the inner larger tooth pointed, the 
outer one often reduced to a small denticle or altogether absent. 
g 
s 
a’, Rostrum long and cylindrical, the antenne inserted at about or 
behind the middle in the @ and much nearer the tip in the gf. 
a’. Tarsal claws toothed. 
a’’, Elytra with the alternate interstices distinctly costate, and 
one or more of the dorsal costz depressed or interrupted 
below the base and usually beyond the middle also 
bo’, Elytra with the alternate interstices costate, the first costa 
interrupted beyond the middle only . - 
ce’. Elytra with the alternate interstices ‘ninterruptedl COs- 
tate : 
ad’, Elytra with the alternate i interstices very feebly costate, the 
dorsal costz interrupted or incomplete. 
6’. Tarsal claws rectangularly dilated in their basal half ‘elytra 
with prominent abruptly interrupted costs ; prothorax feebly 
tuberculate . 2. 2. 1... wee ee ee ek 
b’. Rostrum long and subulate, the apical portion smooth and narrow, 
the antennz in the ? inserted at or behind the middle; elytral 
coste entire... . . . ee 
. Rostrum shorter (except in C. divirgatus), rarely longer than the 
head and prothorax, cylindrical or subcylindrical (as seen from 
above), often gibbous at the base, the antenne inserted towards 
the apex in both sexes. 
ce’. Prosternum (viewed laterally) tuberculate behind each anterior 
coxa; elytra with the two inner coste twice interrupted . 
Species 1, 2. 
Species 3. 
Species 4. 
Species 5. 
Species 6-16. 
Species 17. 
Species 18-22. 
Species 23-26. 
Species 27. 
Species 28, 29. 
Species 30, 31. 
* The types of all the species from Mexico and Colombia described in Schénherr’s work have been seen, as 
well as those of various others from Cuba and Brazil. Dr. Heller has communicated co-types of several of the 
S.-American Conotrachelt described by Kirsch and Faust, and Mr. H. F. Wickham has given us numerous 
N.-American forms. 
t C. latidens, C. triannulatus, and some others would be almost equally well placed under Group B, as 
they have the mesosternum more or less protuberant in front. 
+ C. divirgatus also has the rostrum formed as in this section. 
