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A Way to Distinguish Sex of Adult Hylobius Weevils in the Field

Published online by Cambridge University Press:  31 May 2012

L. F. Wilson ,
C. D. Waddell  and
I. Millers
L. F. Wilson
Affiliation:
Forest Service, United States Department of Agriculture
C. D. Waddell
Affiliation:
Forest Service, United States Department of Agriculture
I. Millers
Affiliation:
Forest Service, United States Department of Agriculture
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Extract

The median depression on the last abdominal sternite is a useful character for distinguishing, in the field, the male from the female adult of all North American Hylobius species.

Everett and Newsom (1964) used a midline depression or sulcus on the abdominal sternites to separate the sexes of the rice water weevil, Lissorhoptrus oryzophilus (Kushel), and other weevils that are not closely related to species of Hylobius in North America. The male of Hylobius abietis L., a European relative, is distinguished from the female by a saucerlilte depression on the last sternite (Anonymous 1952). Millers et al. (1963) state that the first and second visible abdominal sterna of the male H. rhizophagus Millers are concave, and the fifth has a slight median depression; the female sterna are convex.

Type
Articles
Information
The Canadian Entomologist , Volume 98 , Issue 10 , October 1966 , pp. 1118 - 1119
Copyright
Copyright © Entomological Society of Canada 1966

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References

Anonymous. 1952. The large pine weevil (Hylobius abietis). Great Brit. Forest. Comm. Leafl. 1 (rev.), 8 pp.Google Scholar
Everett, T. R., and Newsom, L. D.. 1964. External characters for separating the sexes of the rice weevil, Lissorhoptrus oryzophilus (Coleoptera: Curculionidae). Ann. Ent. Soc. Amer. 57: 514–515.CrossRefGoogle Scholar
Millers, I., Benjamin, D. M. and Warner, R. E.. 1963. A new Hylobius weevil associated with jack pine stand deterioration (Coleoptera: Curculionidae). Can. Ent. 95: 18–22.CrossRefGoogle Scholar
Wood, S. L. 1957. The North American allies of Hylobius piceus (DeGeer) (Coleoptera: Curculionidae). Can. Ent. 89: 37–43.CrossRefGoogle Scholar