360 RHYNCHOPHORA. 
[ Ceuthorrhynchidius. 
their general shape, and from Rhytidosomus by having the elytra cut 
back more angularly at the shoulders. 
I, Tarsal claws simple ; femora, as a rule, not or very 
obsoletely toothed.* 
i. Elytra with strong rows of closely set punctures, 
but without distinct engraved striz; interstices 
narrow ; upper surfaceshiny , . . . © 
ii. Elytra with distinct strie: interstices broader ; 
upper. surface usually rather dull. 
1. Thorax finely and very closely punctured, the 
punctuation being almost concealed by the 
scales, 
A. Thorax trapezoidal; base almost straight . 
B. Thorax not trapezoidal; base _bisinuate; 
slightly produced towards scutellum. 
a. Elytra with a row of white hairs inserted 
in the striz, 
a*, Anterior margin of thorax not raised; 
suture of elytra more thickly clothed 
with whitish scales than dise . . 
b*. Anterior margin of thorax raised ; 
clothing of elytra evenly distributed. . 
b. Elytra without white hairs inserted in the 
strie. 
a*, Thorax with a small but distinct 
tubercle on each side .. . . 
b*, Thorax without or with a very in- 
distinct tubercle on each side. 
a}. Tibize and more or less of rostrum 
red; thorax not strongly transverse . 
bt. Tibize in great part and rostrum 
black ; thorax strongly transverse’. 
2. Thorax distinctly and rather coarsely punc- 
tured; upper surface black with a patch of 
white scales at base of thorax and at scutellum 
and with the apex of vires more or less ee 
reddish . . . 
Il. Tarsal claws dentate beneath or r appendiculate on 
their inner side ; femora, as a rule, at all events 
the posterior pair, plainly toothed. 
i, Size large; upper surface rough and scabrous; 
interstices of elytra with single rows of long stiff 
upright sete; colour reddish-brown. . . 
li. Size smaller ; elytra not scabrous, bearing on 
each interstice one, two or three rows of recumbent 
hairs. 
1. Upper surface black or pitchy black; thorax 
without longitudinal grey lines. 
A. Club of antenne pyriform ; thorax rather 
convex ; elytra convex and rounded, with the 
C, posTHUMUS Germ. 
(pumilio, Gyll.). 
C. niaRinus, Marsh. 
C. MELANARIUS, Steph. 
C. HEPATICUS, Gyll. 
C. FLORALIS, Payk, 
C. PYRRHORHYNCUS, Marsh. 
C. PULVINATUS, Gy/l, 
C. TERMINATUS, Herbst. 
C. HoRRIDUS, Panz. 
* In the case of C. terminatus some specimens have the posterior femora plainly 
toothed, whereas in others the teeth are obsolete or absent ; I am not sure whether 
this difference is sexual or not. 
