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Cyrtinus pygmaeus
Classification
Diagnostic Features of Larvae
- Larva. Form cylindrical, cuneate; integument thin, shining, very sparsely beset with fine, short whitish hairs. Head depressed, twice as long as wide, sides suddenly constricted near base: epistoma thin, straight; labrum roundly rectangular, about one and one-half times as wide as long, widest at base; mandible slender from side, about, twice as long as basal width, shining, cutting edge deeply emarginate, dorsal angle bluntly toothed; antennal ring closed) no ocelli. Ventral mouth-parts not chitinized; maxillary palpi two-jointed, last joint twice as long as basal, longer than last labial; ligula wide; gula indistinct. Prothorax roundly quadrate; pronotum anteriorly smooth, shining, posteriorly not well defined at sides, with a median, smooth, shining, protuberant area, bounded by two rows of pinnately oblique striae on each side, these arising from two longitudinal impression. Ampullae bearing two transverse rows of very small tubercles. Spiracles orbicular. No caudal spine. Adapted from Craighead (1923).
Biology and Economic Importance
- This larva lives under the dry dead bark of a variety of hardwood twigs. It has been collected from Quercus, Hicoria, Cornus, Liriodendron, Robinia, and Acer. The larvae make a very short meandering gallery before pupating in a convex oval cell scarred into the wood. Several generations of adults appear during the summer, the first emerging about the time the oak leaves are half-formed. Adapted from Craighead (1923).
Selected References to Larvae Specimens
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