84 
INSECTS AFFECTING STORED PRODUCTS. 
bisinuate; in the middle lobed, with acute angles. Elyta subquadrate, the 
apices separately rounded, above subplanose. Pygidinni large, rounded at apex, 
descendant. Posterior femora strongly incrassate, slightly toothed and serrate 
about apex. Tibiae terete [cylindrical], posterior tibiae arcuate. Body short- 
ovate, more or less convex. 
THE BEETLE. 
The cowpea weevil may be readily distinguished from all other 
species of the family inhabiting the United States by the two large, 
elevated, ivory-like lobes at the base of the thorax and by the strongly 
pectinate antennas of the male (see fig, 21, a). The body is more 
robust than that of other bean and cowpea feeding forms. 
The ground color is dull red, sometimes more or less blackish, 
variegated with black, brown, yellow, and gray or white pubescence. 
The pattern of the elytra varies, that shown in the illustration being 
the prevailing form, the combi- 
nation of colors making, with 
the somewhat feathery antennae 
of the male, one of the most 
beautiful species of its family 
to be found in America north 
of Mexico. The darkest spots 
at the sides are not round and 
conspicuous as in the four- 
spotted bean weevil, and the 
apical spots are sometimes 
wanting, while often black is 
the prevailing color of the dor- 
sal surface. 
The following description, under the name scuteTlarh Fab., is from 
Horn's synopsis, published in 1873 : 5 * 
Short, robust, brownish, opaque. Hard brown, opaque, densely and coarsely 
punctured, front subcarinate. Antennae variable, usually pale rufous, rarely 
with the outer joints nearly black, as long as head and thorax, male pectinate, 
female serrate. Thorax trapezoidal, sides nearly straight, base trisinuate, 
median lobe emarginate at middle; color brownish opaque; surface coarsely 
punctured intervals rugoso-granulate ; median line in front and narrow space 
at sides sparsely clothed with cinereous pubescence, a small whitish spot on 
each side of the median line near the middle of the thorax, basal lobe white, 
ivory-like, clothed with whitish pubescence. Scutellum convex, white. Elytra 
sub-quadrate, feebly convex, wider at base than thorax ; surface striate, striae 
punctured, intervals flat, scabrous or finely punctulate ; color usually brownish 
or ferruginous with darker spaces at base and humerus, and a darker space 
at middle of side connected along the margin. Pygidium nearly vertical, 
clothed with ochreous hairs, with a whitish line along the middle and a reni- 
form brown spot on each side near the apex. Body beneath brownish, densely 
punctulate, sparsely clothed with whitish hairs: abdomen paler, with a band 
of white hairs at the sides. Legs, anterior and middle pairs, pale rufous. 
Fig. 21. — The cowpea weevil {Pachymerus 
chinensis) : a., Adult male; t, egg; c, post- 
embryonic larva ; d, front view of head of 
same ; e, thoracic leg of same, a, Much 
enlarged ; &, c, more enlarged. (Author's 
illustration.) 
* The small figures refer to the bibliography, pp. 93 and 94. 
