Mr. Spence’s Monograph of the Genus Choleva. 151 
Var. B. nigro-fusca, coxis anticis rufo-ferrugineis. L. C. 1$ lin. 
Mus. D. Leach. | 
This in its general habit, and in the form of its thorax, which 
is rounded at the sides from the apex to the base, and straightly 
truncate behind, agrees with the preceding. It differs from it in 
colour, and in having its thorax more transverse, and appears a 
distinct species. The present section, if more species belong- 
ing to it should be discovered, will admit of a further very natu- 
ral separation into two other smaller divisions ; one including 
. C. chrysomeloides, Leachii, Kirbi, and those akin to them which 
have the sides of the thorax parallel or sub-recurved just at the 
base; and the other comprising those which, like the present 
species, and C. Marshami, have the sides rounded from the base 
to the apex. 
This insect affords a striking example of the necessity of 
attending in these obscure genera to minute characters, such as 
those upon which the families are here separated. In colour and 
general appearance it so exactly resembles C. tristis, that an 
entomologist not versed in the genus would decidedly pronounce 
them the same ; which, in fact, at first I considered them. Upon 
a more careful examination, however, and on separating the 
thorax from the coleoptra, which is often the only way to get a 
clear idea of its basal outline, the difference between the two 
species was abundantly manifest; this being without the slightest 
trace of the lateral excisions which in that are so obvious. 
Other distinctions too exist. The fore part of the head is longer ; 
the antenn are longer and slightly thicker at the apex; and the 
body, when closely compared, narrower. 
+ * * 12. CHo- 
