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Achryson surinamum
Classification
Diagnostic Features of Larvae
- Mature larva. Length up to 23 mm; maximum breadth (at prothorax) 5.5 mm. Form subcylindrical, slightly tapering. Head with sides diverging posteriorly; genae smooth, pale, sparsely setose. Mouthframe ferruginous and completely sclerotized beneath antennae. Antenna with third segment at least three times as long as basal width and about half length of second: supplementary process short, about one-fourth length of third segment. Mandible pitchy, with a shallow fovea which is sometimes longitudinally produced. Labrum roundly trapezoidal, bearing short setae. One pair of ocelli present, contiguous with base of antennae: lens very strongly protuberant; pigmented spot indistinct. Hypostoma transversely rugose, with front margin narrowly ferruginous ; sutures distinct, almost straight; gula narrow, with sutures protuberant. Maxilla with third segment of maxillary palpi as long as second; process of palpifer distinct but very short. Prothorax trapezoidal, with lateral regions bearing fine, slender setae. Pronotum strongly and regularly punctate anteriorly; finely reticulate and irregularly, longitudinally striate posteriorly; median cleavage line distinct. Mesonotum and metanotum finely granulate. Prosternum bisected by a strongly raised, longitudinal ridge. Abdomen with dorsal ampullae shining, finely reticulate and with two pairs of lateral impressions. Ninth tergite with a pair of paramedian, oval, testaceous, carinae or tubercles which are rather faint in some specimens. Pleural discs granulate and distinct on first three abdominal segments. Legs four-segmented, testaceous, about as long as maxillary palpi. Spiracles small, broadly oval, with peritreme thin and pale. Adapted from Duffy (1953).
Biology and Economic Importance
- Larvae of this species feed in the wood of Cercidium, also Acacia, and Prosopis, working much as does Neoclytus. Adapted from Craighead (1923).
Selected References to Larvae Specimens
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