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A Secondary Sex Character on the Male of the California Five-spined Engraver, Ips confusus (Lec.) (Coleoptera: Scolytidae)1

Published online by Cambridge University Press:  31 May 2012

R. L. Lyon
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Extract

A study of 2,500 adults of the California five-spined engraver, Ips confusus (Lec.), has shown that the sex of this beetle can be determined from a secondary sex character with an accuracy exceeding 99 percent. Insects often have secondary characters that indicite sex, and in species with concealed genitalia, reliable secondary characters are especially useful for rapidly separating the males and females. Where such characters are lacking, a dependable determination of sex can only be made by the laborious procedure of dissection for a check of genitalia.

Type
Articles
Information
The Canadian Entomologist , Volume 87 , Issue 11 , November 1955 , pp. 482 - 483
Copyright
Copyright © Entomological Society of Canada 1955

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References

Literature Cited

1.Hopkins, A. D. 1894. Sexual characters in Scolytidae. Can. Ent. 26: 274–280.CrossRefGoogle Scholar
2.LeConte, J. L. and Horn, G. H.. 1876. The Rhynchophora of America, North of Mexico. Proc. Am. Philos. Soc. 15(96): p. 364.Google Scholar
3.Struble, G. R. 1947. A study of factors in the development of Ips outbreaks. Manuscript Report, Forest Insect Laboratory, Berkeley, Calif, p. 6.Google Scholar
4.Thatcher, T. O. 1948. A taxonomic and biologic study of the genus Ips (Scolytidae, Coleoptera) in western North America. Univ. of Calif. Ph.D. thesis, pp. 1–150.Google Scholar