. Circular. Insect pests; Insect pests. {Buhiiiinus iiroboscideus Fab.) The larger chestnut weevil (fig. 2) is considerably the larger and more robust species. The female rostrum or beak, although proi)ortion- ately of about the same length as in the lesser weevil, is per- ceptibly more prominent be- cause less curved, the curvature being toward the tip. It is also more widened at the base. The body measures from one- third to nearly one-half of an inch in length, and the beak of the female is often five- eighths of an inch long. That of the male (fig. 2, c) is nearly as long as the elytra. Th
. Circular. Insect pests; Insect pests. {Buhiiiinus iiroboscideus Fab.) The larger chestnut weevil (fig. 2) is considerably the larger and more robust species. The female rostrum or beak, although proi)ortion- ately of about the same length as in the lesser weevil, is per- ceptibly more prominent be- cause less curved, the curvature being toward the tip. It is also more widened at the base. The body measures from one- third to nearly one-half of an inch in length, and the beak of the female is often five- eighths of an inch long. That of the male (fig. 2, c) is nearly as long as the elytra. The ^SS ii^ small, about one-six-Fig- --âThe larger chestnut weevll (iJa/a?u' j^coftos- . ,1 (⢠â 1 1 1 -P cideus): a. Female beetle; h, same in outline from teentn or an men long, ana or gj^jg. c, head, rostrum, and antenna of male. Three the outline shown in figure times natural size (author's illustration). o, d. It is nearl}' white, partially translucent, and without sculpture. The larva (fig. 3, a) is milk-white, robust, fully three times as long as wide, with the dorsal or upper portion rounded and con- vex. The entire surface is very strongly wrinkled a 3. h c transversely, and there are FiCi. 3.âLarger chestnut weevil {Balanivuf: proho»cideus): fj feW VCrV sllOrt hairS SCat- a. Larva: b, c, female pupa; (/, eggs. All enlarged (au- - ' it/. thor'sillustration). tcrcd sparscly over the dif- ferent .segments. The head (fig. 4) is about one-fourth as wide as the widest portion of the body. It is provided with _ short but strong mandibles, by means of which it gnaws the kernel constituting its food. The fully developed larva in ordinary resting position measures nearly half an inch. Although the larva has no true legs, it is able to crawl, slowly and clumsily, it is true, by means of of the flattened lower surface, locomotion being aided by transverse wrinkles. The pupa is of a clearer whitish color than the larva, and shows the principal external organs of the b
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1904
