288 Mr. George Charles Champion on the Serricorn 
Group CARDIOPHORINT. 
Horistronorus, Cand. 
Horistonotus sericeus, sp. 0. 
Moderately elongate, convex, rather broad, shining ; black, the 
anterior and hind angles of the prothorax and the front of the 
head more or less reddish, the legs and antennz testaceous or 
obscure testaceous; clothed with a fine, silky, fulvo-cinereous 
pubescence. Head densely, minutely punctate, with intermixed 
much coarser punctures, the frontal carina rather prominent ; 
antenne slender, extending to far beyond the hind angles of the 
prothorax, Prothorax distinctly broader than long, widest a little 
behind the middle and rapidly narrowing thence to the apex, 
slightly constricted towards the base, the base deeply bi-incised on 
either side, the marginal carina extending to near the apex; the 
entire surface densely, very minutely punctate, with distinct inter- 
mixed slightly coarser punctures, and sometimes with a short 
median channel before the base ; the hind angles moderately pro- 
duced, not divergent, incurved at the tip. Elytra two and three- 
fifths longer than the prothorax and a little wider than it at the 
base, somewhat rounded at the sides, gradually narrowing from 
about the basal fourth, the humeri rounded externally ; deeply 
punctate-striate, the interstices convex, all becoming acutely costate 
towards the apex, the alternate ones appearing a little more 
raised than the others, and also thickly, minutely punctate, with 
scattered coarser punctures intermixed. Beneath densely, very 
minutely punctate, with intermixed coarser punctures ; the sixth 
ventral segment, and also the apex of the fifth, longitudinally 
wrinkled. Hind coxal plates very broadly dilated in their inner 
half. Tarsal claws bicuspid at the tip. 
Length 10-11}, breadth 33-34 millim. 
Hab. St. Vincent—Kingstown and Windward side. 
Three specimens, their sex not ascertained. Closely 
allied to the widely distributed H. ewxoletus, Erichs. ; but 
much larger and broader, with the dense general punctua- 
tion of the upper and under surfaces very minute, the 
thorax more narrowed anteriorly, and the elytra less 
acuminate at the apex. From H. acutipennis, Cand., 
from Venezuela, which it approaches in size, it may be 
known by its less elongate shape, shorter thorax, less 
acuminate elytra, less abruptly dilated hind coxal plates, 
and the finer general punctuation, especially of the under 
surface. 
