Abstract
Biology of Xylotrechus basifuliginosus (Cerambycidae: Coleoptera: Clytini) was studied on its host Kharsuoak Quercus semecarpifolia Smith. It has an annual lifecycle with five larval instars. Beetles emerge atthe onset of the rainy season (June-July) under natural conditions at 2600-2800 m. Females soon aftercopulation lay up to 34 eggs in cervices and covered depressions on the bark of oak trees. The larvalperiod is 269 days under natural conditions. The growing larvae feed in the sapwood up to December andthereafter go into hibernation (end of December-mid of March) in larval galleries. Pupation is triggeredby sudden rise in temperature in spring (end of March), pupal period is ~94 days. The beetles emergefrom the pupal chamber by chewing the bark and making a circular exit-hole (5 mm dia). The adultmorphology (both sexes) and male genitalia, are described and compared with its congeners X. smei andX. stebbingi also known from northern India, besides the morphology of egg, larval and pupal stages.
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