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A Note on Sexual Dimorphism in Sitophilus1 Weevils

Published online by Cambridge University Press:  31 May 2012

C. Sevintuna  and
A. J. Musgrave
C. Sevintuna
Affiliation:
Department of Entomology and Zoology, Ontario Agricultural College, Guelph, Ontario
A. J. Musgrave
Affiliation:
Department of Entomology and Zoology, Ontario Agricultural College, Guelph, Ontario
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Extract

The advantages of being able to determine the sex of insects by means of external characters are obvious, particularly when, as with the Sitophilus weevils, they have been favoured as experimental material by many workers. In Sitophilus oryza (L.), the sex can apparently readily be determined by reference to the relative length of and type of puncturing of the rostrum (Richards, 1947). There has seemed, however, to have been some doubt about a similar reliable method of determining sex in Sitophilus granarius (L.). Richards (1947) stated that there was no certain way of determining the sex of this species without risking injury to the female. In a later paper (1948) he implied, in a footnote, that a specimen could be sexed by reference to the length and slenderness of the rostrum. This had been given as a method of sexing these insects by Back and Cotton (1926).

Type
Articles
Information
The Canadian Entomologist , Volume 92 , Issue 6 , June 1960 , pp. 467 - 469
Copyright
Copyright © Entomological Society of Canada 1960

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References

(1)Back, E. A., and Cotton, R. T.. 1926. The granary weevil. U.S. Department of Agriculture. Department Bull. No. 1393, 1–36.Google Scholar
(2)Musgrave, A. J., and Miller, J. J.. 1958. Studies of the association between strains and species of Sitophilus weevils and their mycetomal micro-organisms. Proc. Xth. Int. Congr. Ent. 2: 315–318.Google Scholar
(3)Richards, O. W. 1947. Observations on grain weevils Calandra (Col. Curculionidae). I. General biology and oviposition. Proc. Zool. Soc. Lond. 117: 1–43.CrossRefGoogle Scholar
(4)Richards, O. W. 1948. The interaction of environmental and genetic factors in determining the weight of grain weevils, Calandra granaria (L). (Col. Curculionidae). Proc. Zool. Soc. Lond. 118: 49–81.CrossRefGoogle Scholar
(5)Vaurie, Patricia. 1951. Revision of the genus Calendra (formerly Sphenophorus) in the United States and Mexico (Coleoptera, Curculionidae). Bull. Amer. Mus. Nat. Hist. 98: Art. 2.Google Scholar