The polymorphism in Philaenus spumarius (L.) (Hemiptera: Cercopidae) in British Columbia

D. J. Farish, G. G. E. Scudder


This paper analyses the distribution and relative frequency of the morphs of <i>Philaenus spumarius</i> in British Columbia, the populations being drawn from different biotic areas. 1t is shown that nine morphs occur in the province and of these, <i>marginellus</i> occurs only in the south-west corner; <i>marginellus</i> and <i>lateralis</i> occur only as females. The frequency of the morphs in the biotic areas of the province is not uniform; populations in dry areas differ signIficantly from those in wet areas. Populations taken from the various forest areas are not identical, nor are those from coastal areas. Within a single biotic area, the frequency of morphs appears to be stable. No significant difference was determined between two samples taken sixteen years apart. Further, there appears to be no significant seasonal, daily or hourly change in the morph frequency in an area. An experiment carried out on mating individuals failed to demonstrate a tendency for non-random mating and there was no evidence for the preferential mating of the rarer types.


polymorphism; <i>Philaenus spumarius</i>; Hemiptera; Cercopidae

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