 |
Dorcaschema nigrum
Classification
Diagnostic Features of Larvae
- Larva. Form elongate, subcylindrical; integument rather firm, shining, sparsely clothed with yellowish-white hairs. Head depressed, sides scarcely constricted behind middle; epistoma straight, rather abruptly declivous; labrum thin, fungiform, but little wider than long, anterior margin densely ciliate; mandible short, about one and one-half times as long as basal breadth, dull black, cutting-edge obliquely truncate; antennal ring entire; one pair of white ocelli. Ventral mouth-parts rather extended, hairs very fine; mentum twice as wide as long, sunken, distinct; palpi slender, maxillary longer than lacinia, last joint of maxillary equal to second, slightly longer than last labial; anterior edge of hypostoma thin, curved, hypostoma transversely bulging; gula not distinct. Prothorax trapezoidal, depressed, widest behind; pronotum entirely smooth, shining, or very indistinctly longitudinally striate, lateral sutures impressed behind, anteriorly a group of fine hairs at each side. Mesonotum smooth, shining; metanotum, mesosternum, and metasternum tuberculate. Abdomen cylindrical; ampullae sensibly bilobed, dorsal and ventral with two rows of irregular tubercles divided along median line; pleural tubercle elongate rectangular, a chitinous pore at each extremity; epipleurum protuberant on last three segments. Spiracles orbicular, distinctly rimmed. Adapted from Craighead (1923).
Biology and Economic Importance
- This species has been collected only from dead hickory (Carya) branches throughout the eastern United States. The larvae feed between the bark and wood, making a curved pupal cell in the sapwood and emerging by a hole at the opposite end from which it entered the wood. Adapted from Craighead (1923).
Selected References to Larvae Specimens
| |
