Brentidae. Giraffe beetles.

These relatives of the true weevils are typified by an elongate, very slender form.

Most are black with parallel, longitudinal yellow lines on the wing covers, and the body surface is very smooth and slippery. They are generally small to medium-sized (BL 8-50 mm), but there is considerable variation in size among individuals of the same species due to the different environmental conditions experienced by the larvae. The larvae are known to bore under the bark of dead or dying hardwoods, but the detailed biologies of few species have been elucidated. Brentus anchorago (fig. 9.16e) is one of the most common and widespread species, occurring in lowland dry to wet forests. The adults are frequently found in great numbers (up to 400 per square meter) under the loose bark of dead Bursera, Simarouba, and Pseudobombax and logs of other trees (Johnson 1983a).

Promiscuous reproductive aggregations often occur on host trees, and intense competition and fighting ensues between males for females and between females for suitable oviposition areas. Larger males seem to have greater mating success than smaller ones. Females lay their eggs in holes bored with the jaws at the tip of their beak into the surface of dead trees (Johnson 19836).


Johnson, L. K. 1983a. Brentus anchorago (bren-tido, brentid beetle). In D. H. Janzen, ed., Costa Rican natural history. Univ. Chicago Press, Chicago. Pp. 701-703. Johnson, L. K. 19836. Reproductive behavior of Claeoderes bixnttata (Coleoptera; Brentidae). Psyche 90: 135-149.

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