Comprehensive Description

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General Description

Wingspan 19.5-27.5 mm in females, 18-24 mm in males; forewings white dorsally, underside mostly dark brown; hindwing brownish gray, dorsally, light brown ventrally (Pellmyr 1999). Head white, antennae and proboscis yellow; females with specialized maxillary tentacles arising from the base of each maxillary palpus; these are tubular and membraneous with numerous short, hooked hairs scattered on the inner surfaces which help retain pollen (Pellmyr 2000).Thorax white, legs yellow; Abdomen pale brown dorsally, ventrum white (Pellmyr 1999). When the female ovipositor is withdrawn, the tip of the abdomen is truncate, and the terminal joint bluntly rounded at tip with a corrugated ridge dorsally before the tip (Riley 1892). Pupa with acute spine on head and spines on back (Riley 1892). Larvae less than 1 mm when newly hatched, 14 mm at maturity; at first translucent white but turning yellowish, then reddish; no pro-legs but thoracic legs developed; undergoes three moults (Riley 1892). Egg thread-like; about 2 mm in length (Riley 1892).


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© University of Alberta Museums

Source: University of Alberta Museums

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