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Lepturges symmetricus
Classification
Diagnostic Features of Larvae
- Larva. Form sub-depressed, slender; integument firm, shining, very finely wrinkled, sparsely clothed with fine whitish-yellow pubescence. Head depressed, exposed parts finely granulate, sides tapering gradually posteriorly; labrum very broadly oval, little wider than long; mandible slender, finely granulate at base, about twice as wide as basal width, cutting edge dull, obliquely rounded; antennal cavity open behind, a slight projection above; one pair of large ocelli. Ventral mouth-parts thin; mentum distinct, not sunken, twice as wide as long, it and stipes finely granulate; last joint of maxillary palpi longer than second, about equal to or slightly shorter than basal and last labial; anterior edge of hypostoma slightly curved; gula not distinct. Prothorax trapezoidal, widest behind; pronotum entirely shining, finely reticulated to alutaceous, a few scattered hairs anteriorly: sternum shining, rugulose, wrinkled, hairy, eusternum and sternellum glabrous. Mesonotum shining, finely wrinkled; metanotum, mesosternum, and metasternum tuberculate. Abdomen shining, subcylindrical; ampullae bearing two transverse rows of tubercles; epipleurum protuberant on last three segments; pleural tubercles large, oval, having two chitinous pits and from 3 to 4 setae. Spiracles orbicular, smaller than ocellus, peritreme slightly chitinized. The last abdominal tergum bears a long, very slender, acute, curved, chitinous spine. Adapted from Craighead (1923).
Biology and Economic Importance
- Working under moist decayed bark the larvae either enter the sapwood or bark to pupate. This species breeds most commonly in Juglans but also in Carya, Celtis, Morus, and Castanea. The adults are found throughout the Eastern United States and Canada during June and July. Adapted from Craighead (1923).
Selected References to Larvae Specimens
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