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Dorcaschema cinereum
Classification
Diagnostic Features of Larvae
- Larva. Form slender, tetragonal, slightly tapering; integument thin, shining, very sparsely clothed with fine whitish hairs. Head slightly depressed, sides rapidly narrowed posteriorly and slightly anteriorly, constricted behind middle, widest just before middle; epistoma thin, slightly curved; labrum widest at middle, anterior margin broadly rounded, densely and finely ciliate; mandible rather slender from side, about twice as long as basal width, strongly curved; cutting edge obliquely emarginate; antennal ring closed; one pair of ocelli; ventral mouth-parts fleshy; mentum distinct, one and one-half times as wide as long, sunken; last joint of maxillary palpi very slender, equal to second and last labial; ligula large; hypostoma rather strongly transversely protuberant. Prothorax trapezoidal, thick, widest behind; pronotum posteriorly smooth, shining or very finely rugulose, having lateral angles clothed with fine whitish hairs; sternum anteriorly regularly and finely hairy; eusternum not distinct, glabrous, shining. Mesonotum glabrous, shining; metanotum, mesosternum, and metasternum tuberculate. Abdomen slender, ampullae bearing two irregular rows of tubercles, third, fourth, fifth, sixth and seventh very deeply bilobed, forming two projecting lobes and giving body tetrahedral form; epipleurum protuberant only on last three segments; pleural tubercle elongate, having two large, distinct, chitinous pits and one long slender seta. Spiracles small, nearly orbicular. No caudal spine. Adapted from Craighead (1923).
Biology and Economic Importance
- The larva mines for the greater part of the time under the bark, going into the wood, often quite deeply, to make a long, curved pupal cell, closed at both ends by a plug of fibrous frass. Larvae have been collected from Hicoria, Celtis, Morus, and Tilia. Adapted from Craighead (1923).
Selected References to Larvae Specimens
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