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First North American records for Heterarthrus vagans (Hymenoptera: Tenthredinidae), a Palaearctic leafmining sawfly of alder

Published online by Cambridge University Press:  02 April 2012

Leland M. Humble
Leland M. Humble
Affiliation:
Canadian Forest Service, Natural Resources Canada, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5 (e-mail: leland.humble@nrcan-rncan.gc.ca)
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Abstract

The discovery in southwestern British Columbia of widespread established populations of the Palaearctic leafminer Heterarthrus vagans (Fallén) feeding on native red alder, Alnus rubra Bong. (Betulaceae), is reported. A preliminary survey suggests that it is currently confined to the Fraser Valley west of Hope, its distribution extending north along Howe Sound almost to Squamish. It was not found in the greater Victoria area. No other regions of the province have been surveyed. This introduced sawfly completes at least two generations a year. Diagnostic characters to aid the recognition of adults and feeding larvae of H. vagans and a modified key to adult Heterarthrinae on Betulaceae are provided.

Résumé

Des populations établies à large répartition de la mineuse paléarctique Heterarthrus vagans (Fallén) se nourrissant d'aulnes, Alnus rubra Bong., indigènes ont été découvertes dans le sud-ouest de la Colombie-Britannique. Un inventaire préliminaire laisse croire que l'espèce est actuellement confinée à la vallée du Fraser à l'ouest de Hope et qu’elle s’étend vers le nord le long du détroit de Howe presque jusqu’à Squamish. Elle ne se retrouve pas dans la grande région de Victoria. Aucune autre région de la province n’a été inventoriée. Cette mouche-à-scie introduite complète au moins deux cycles par année. Une présentation des caractères diagnostiques aidera à reconnaître les adultes et les larves mineuses actives d'H. vagans et une clef modifiée des Heterarthrinae sur les Betulaceae permettra l'identification des adultes.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 142 , Issue 2 , April 2010 , pp. 181 - 187
Copyright
Copyright © Entomological Society of Canada 2010

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