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Hyperplatys aspersa
Classification
Diagnostic Features of Larvae
- Larva. Form subcylindrical, slender; integument very finely granulate, shining, sparsely clothed with fine whitish hairs. Head depressed, exposed portion finely granulate, sides slightly tapering; anterior margin of labrum roundly curved from behind middle, one and one-half times wider than long; mandible slender, twice as long as wide, basal half finely granulate; antennal cavity open; one pair of ocelli. Maxillary palpi slender, last joint slightly shorter than two basal joints, shorter than last labial; mentum distinct, transverse, not sunken; anterior edge of hypostoma roundly curved; gula not protuberant. Pronotum smooth, shining except for very narrow posterior border of dull fine granulations, sometimes extending over one-third of the area. Ampullae tuberculate, the tubercles arranged in two irregular rows; pleural tubercle, with two very distinct chitinous pits and several setae. Spiracles orbicular, about the size of the ocellus, rather strongly rimmed. No caudal spine. Pupa. Form as in adult; about 20 small setiferous points on front of head (including base of antennae), a row of 10 on anterior margin of pronotum, and a group on anterior lateral angles; mesonotum and metanotum glabrous; an irregular median group on abdominal terga (these very small), larger ones on penultimate segment and still larger ones (about 8) on last segment. Adapted from Craighead (1923).
Biology and Economic Importance
- A large series of this material has been reared in which two forms of adults are found, each being constant in the same food plant in the same locality. An equally large series of larvae, however, show no constant differences. The larvae mine under moist bark, making a short pupal cell in the sapwood plugged with a wad of fibrous frass. The adult emerges through the same hole through which the larvae entered the wood. One complete and a partial second generation occur each year under favorable conditions. Larvae and adults have been collected throughout the eastern and central western United States and Canada from Rhus, Castanea, Cornus, Tilia, Juglans, Celtis, Alnus, Celastrus, and Prunus. Adults fly from April to June. Adapted from Craighead (1923).
Selected References to Larvae Specimens
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