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Eggs are yellowish brown in color and larvae are creamy white with a brown head (Oregon State University Extention). The pupae are also creamy white, and reveal distinct adult parts with separate wing sacs along their backs that eventually fuse (Shearer). Adults are blackish, 9 to 11 mm long, have elbowed antennae slightly widened at the tip, have fused elytra and cannot fly. They have patches of golden scales on their elytra covered with yellow curled hairs (Warner and Negley 1976). The apex of their tibia is rounded, their femora are toothed, and their rostrum is long and widened at the tip (Warner and Negley 1976). Although the weevils are parthenogenetic and there are no males in North America, they do have a spermatheca (Cram 1958). Adults tend to aggregate in large groups due to pheromones and other attractants (Alford et al. 1996). Royal Alberta Museum page


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Source: University of Alberta Museums

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