. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fig. :-i.—The tobacco Crambus: Full-grown larva, or "wireworm. Much enlarged. (Original.) brown, flecked with darker brown. The cervical shield is distinct, shining, yel- lowish brown, tinged with fuscous, and bears 12 hairs in two transverse equal rows. The anal shield is pale fuscous. About the middle of abdominal segments 3, 4, 5, and 6, and slightly above the spiracles, is a series of distinct, dark fuscous, chitinous areas about the size and shape of spiracles, one to each segment. The arrangement of the tube
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fig. :-i.—The tobacco Crambus: Full-grown larva, or "wireworm. Much enlarged. (Original.) brown, flecked with darker brown. The cervical shield is distinct, shining, yel- lowish brown, tinged with fuscous, and bears 12 hairs in two transverse equal rows. The anal shield is pale fuscous. About the middle of abdominal segments 3, 4, 5, and 6, and slightly above the spiracles, is a series of distinct, dark fuscous, chitinous areas about the size and shape of spiracles, one to each segment. The arrangement of the tubercles is as follows: Beneath the anterior margin of the cervical shield is a tubercle bearing two hairs. The mesothorax above bears eight setigerous tubercles on the anterior margin, each, ex- cept the lateral tubercle, with two hairs. Posteriorly it is provided with three bare tubercles, of which the medi- an is narrow and transverse. The metathorax is armed, as is the mesothorax. Each abdominal segment above the spiracles bears two transverse rows of four tubercles each. The anterior dorsal pair are subquadrate, with the posterior lateral angles strongly rounded. The posterior dorsal pair are oblong, transverse, about half as long as the anterior, with the posterior lateral angles strongly rounded. The anterior lateral tubercles are supraspiracular, irregularly quadrate, with the lower margin produced diagonally behind the spiracle, emarginate at the spiracle and before the impressed area on segments 3, 4, 5, and 6. The corresponding tubercle on segment 8 has the pro- duced portion isolated and is placed anterior to the spiracle. The posterior lateral tubercles are trans- verse, elongate, and somewhat oblique. Abdominal segments 1 to 7 each bear a minute spinule anterior to and nearly equidistant from the spiracle and the supraspiracular hair. The legs are pale brown, the maxillary palpi brown, and the mandibles brownish fuscous at apices. The color of larvae collected from
Size: 1641px × 1523px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1900, bookdecade1910, booksubjectagriculture
