316 RHYNCHOPHORA. 
CHALCODERMUS. 
Chalcodermus, Schiénherr, Gen. Cure. iv. p. 377 (1837) ; Lacordaire, Gen. Col. vil. p. 70; Horn, 
Proc. Am. Phil. Soc. xiii. p. 465 (part.) ; Leconte, op. cit. xv. p. 286 ; Casey, Ann. N. York 
Acad. Sci. vi. p. 443. 
An American genus ranging from the Southern United States to Brazil. It is easily 
distinguished from Rhyssomatus by the tarsal claws being simple, and subconnate at 
the base. Most of the species are brilliantly metallic. In C. crassipes the rostral 
canal is long, broad, and deep, extending to the metasternum. ‘The peculiar armature 
of the head of the female in two of the known forms has not previously been noticed. 
Some of the species, as already noted (antea, p. 113), bear a superficial resemblance 
to the smaller Sternechi (Tylomus). The Central-American representatives may be 
identified by the following table :— 
a. Rostral canal short, not extending beyond the prosternum ; body more or 
less metallic, except in C. longirostris. 
a’. Blytra with the humeri dentiform ; mesosternum depressed between 
the cox ; tibie sharply mucronate at the inner apical angle. 
a!, Prothorax coarsely, longitudinally strigose on the disc. 
a", Seriate punctures ov the elytra somewhat distant . . - + + + dentiferus, Faust. 
b!", Seriate punctures on the elytra closely placed . . . . - . + collaris, Horn. 
b!'. Prothorax closely, confluently punctate, the narrow interspaces longi- 
tudinally raised anteriorly . - 6 6 + + eos hot tt ts nigroeneus, Sp. 0. 
c. Prothorax closely, confluently punctate, the interspaces obliquely 
yaised . . ee ee ee . 2 +) «Cupreipes, sp. N. 
d'. Prothorax punctate, the punctures separate on the disc. . . . . angularis, sp. 0. 
#. Elytra angularly or subangularly dilated at the sides at some distance 
below the humeri, which are not prominent; mesosternum flattened 
between the cox; head bituberculate between the eyes in front in 
the ?; tibiz mucronate at the inner apical angle. 
2!. Prothorax without median lateral tooth, coarsely punctate on the 
disc. . ee we eee ee ee we ee BNEUS; Boh. 
f'. Prothorax with a median lateral tooth, sparsely, finely punctate on 
the disc . . ... - angulicollis, Fahr. 
cl, Elytra not or slightly widened beneath the humeri, which are obtuse or 
moderately prominent, and narrowing thence to the apex; meso- 
sternum flattened between the cox ; head swollen between the eyes 
anteriorly in C. calidus. 
g". Intermediate tibie sharply toothed, and the others angularly dilated, 
at about the middle within, all more or less mucronate at the inner 
apical angle. 
c', Prothorax coarsely, obliquely strigose; elytra transversely rugu- 
lose at the base, the alternate interstices a little raised, and all 
convex towards the apex. . . . « - ee ee ee ee Calidus, Fabr. 
