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COMPLEXITIES IN THE NUMBER OF LARVAL INSTARS OF THE BIRCH CASEBEARER IN NEWFOUNDLAND (LEPIDOPTERA: COLEOPHORIDAE)

Published online by Cambridge University Press:  31 May 2012

Arthur G. Raske
Arthur G. Raske
Affiliation:
Newfoundland Forest Research Centre, Canadian Forestry Service, St. John's, Newfoundland
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Abstract

The birch casebearer, Coleophora fuscedinella Zeller, has five larval instars in northeastern North America, but commonly only four in insular Newfoundland. The occurrence of four larval instars in Newfoundland represents the omission of either the third or the fourth instar. Local Newfoundland populations may have five larval instars, but the late-developing larvae of these populations have only four larval instars. Head capsule width can be used to identify instars but case characteristics are recommended because the bimodality of third instar head widths can cause confusion.

Type
Articles
Information
The Canadian Entomologist , Volume 108 , Issue 4 , April 1976 , pp. 401 - 405
Copyright
Copyright © Entomological Society of Canada 1976

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