342 RHYNCHOPHORA. [ Ceuthorrhynchus. 
species are so closely allied that several authors have had consider- 
able doubt as to their being specifically distinct; the following table 
will be found of considerable serviee, but as some of the chief characters 
are not very obvious, it will be found more useful for particular groups 
than for the species taken as a whole. 
I. Femora not toothed. 
i. Tarsal claws dentate beneath or appendiculate on 
their inner side, 
1. Rostrum black. 
A. Elytra with small tubercles before apex . . C. SYRITES, Germ. 
B. Elytra without tubercles before apex. 
a. Elytra black, rather Dah ik with nie 
rows of whitesete . . . . . C. sETosus, Boh. 
(atomus, Boh.) 
b. Elytra covered with moderately close grey 
scales . Bo bee ee fie co Cs CONSTRIODUS, Manele 
2. Rostrum bright red ; form very short and con- 
vex with coarse ely fall sbtieat td bce ho UUM: ERICH, Gyll. 
ii. Tarsal claws simple, rather slender. 
1. Elytra with a band of white sculesextending the 
whole length of the suture. . - (C. suturalis, F.\ 
2. Elytra without sutural band of w hite scales, 
A, Elytra with a white patch of scales at 
scutellum .. . C. cOCHLEARIZ, Gyll. 
B. Elytra without a white ‘patch at ‘scutellum, 
a. Upper surface thickly clothed with grey 
scales... . C. Assimitis, Payk. 
b. Upper surface without or almost without 
scales, shining and apparently glabrous. 
a®*, Elytra bright blue or violet; punctures 
of striz finer, of thorax coarser; thorax 
with aslight central furrow. . . C. ERYSIMI, F. 
b*. Elytra with a very slight bluish green 
or zneous reflection ; punctures of strie 
coarser, of thorax finer: thorax without 
central "furrow Aiea . C.conrRaotus, Marsh. 
II. Femora, at all events the posterior pair, toothed, as 
a rule plainly, but in one or two cases with the 
teeth obsolete in one sex.* 
i. Tarsal claws dentate beneath or appendiculate on 
their inner side. 
1. Elytra without scales, but with raised hairs, 
visible if viewed sideways, and forming single 
rows on each interstice. 
A. Anterior femora with a small tooth; posterior 
femora with a distinct tooth; elytra bright 
blue. 
a. Strie of elytra narrow, interstices flat . . C. CYANIPENNIS, Germ. 
(sulcicollis, Payk. nee Gyll.) 
b. Strie of elytra broad, interstices convex. . C, CHALYB&US, Germ. 
B. Anterior femora without tooth; posterior 
femora with a small tooth in female and with 
* This is the case with C. Airtulus only among our species. 
