Aggregation sites and behaviour of two wpecies of Hippodamia (Coleoptera: Coccinelidae) in south-central British Columbia

G. J. Fields, R. D. McMullen

Abstract


<i>Hippodamia caseyi</i> Johnson and <i>H. oregonensis</i> Crotch overwinter in aggregation sites on mountain tops in south-central British Columbia. Each species selects distinctive overwintering sites. During the summer. <i>H. caseyi</i> is distributed mainly in the vallevs and lower mountain elevations, particularly in irrigated alfalfa fields. <i>H. oregonensis</i> is restricted to subalpine and alpine areas during the summer. Availability of suitable overwintering sites may be a limiting factor in the abundance of <i>H. caseyi</i>.

Keywords


Coleoptera; Coccinelidae; i>Hippodamia</i>

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References


Chapman, J.A. 1954. Studies on summit-frequenting insects in western Montana. Ecology 35:41-49.

Chapman, J.A., J.I. Romer and J. Stark. 1955. Ladybird beetles and army cutworm adults as food for grizzly bears in Montana. Ecology 36:156-158.

Edwards, J.G. 1957. Entomology above timberline: II. The attraction of ladybird beetles to mountain tops. Coleopterists' Bull. 11:41-46.


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