Obrium rufulum Classification Family Cerambycidae > Subfamily Cerambycinae > Tribe Obriini > Genus Obrium Diagnostic Features of Larvae Larva. Form very elongate, slender, cylindrical; integument thin, shining, sparsely covered with fine whitish hairs. Head depressed, transversely oval; mouth-frame scarcely corneous; clypeus and labrum thin, latter rectangularly oval, sparsely hairy; mandibles robust, basal piece reddish brown, about one-third length of the distal, latter piceous, shining; antennae short, first and second joints globular, transverse, second slightly longer; ocellus large, not protruding; gena not shouldered, bearing numerous long, rather stiff brownish bristles. Ventral mouth-parts rather elongate, last joint of labial and maxillary palpi slender, twice the length of second maxillary joint; process of palpifer large, distinct, also a process on first joint of maxillary palpi; gula triangular, distinct. Prothorax depressed; pronotum rectangular, about twice as wide as long, uniformly hairy in front, posteriorly shining, with a few widely separated striae, often a faint median suture; sternum very broad, narrow; eusternum faintly distinct; ventro-lateral suture faint, oblique; sternellar band fused into lateral region at extremities. Mesonotum and metanotum dull, granulate. Each leg an almost invisible joint. Abdomen very slender, with wide intersegmental skin; first and second dorsal and ventral ampullae dull, granulate, third, fourth, fifth and sixth deeply bilobed, the lobes teat-like, projecting; intersegmental skin between fifth and sixth dorsal ampullae dull, coarsely granulate. Pleural discs not distinct. Spiracles orbicular, very minute, smaller than ocellus, peritreme thin. Pupa: Several long setae on disc of pronotum and a large group near posterior border, mesonotum and metanotum glabrous; third, fourth, fifth and sixth abdominal terga bearing an anterior irregular band of fine, slender, curved points and a posterior band of setae; seventh with two large hooks on posterior margin. Adapted from Craighead (1923). The larva has been found only in the dead branches of ash (Fraxinus). It works beneath the bark for a short time, spending; most of the larval life in the wood. Several generations continue to breed in the same twigs, which they completely honeycomb. This is a true dry wood borer. The mines are tightly packed with granular frass. One year is required to complete the life cycle. Adapted from Craighead (1923). Biology and Economic Importance Members of this tribe are known from various host plant families. Species of this tribe are potentially invasive outside their native range. Selected References to Larvae Specimens Craighead, 1923