Euxoa chimoensis Hardwick, 2010

Lafontaine, Donald & Troubridge, James, 2010, Two new species of the Euxoa westermanni species-group from Canada (Lepidoptera, Noctuidae, Noctuinae), ZooKeys 39 (39), pp. 255-262 : 261-262

Euxoa chimoensis Hardwick , stat. rev.

Figs 13–18, 23, 28

Diagnosis. This species was treated as a subspecies of Euxoa macleani in Lafontaine (1987) . Unlike Euxoa macleani , which occurs only as a single form (Figs 10–12) with a dark brownish-gray forewing with most maculation obscure except for black transverse lines and medial line, E. chimoensis occurs in three color forms with two pattern forms. The forewing may be reddish brown, blackish brown or gray. For each of these color forms the forewing occurs in two pattern forms; in one form (Figs 13, 14) the transverse lines are prominent and the reniform and orbicular spots are similar to the ground color or darker; in the second form (Figs 15–18) the transverse lines and or- bicular and reniform spots appear mainly paler than the ground color; both of these forms seem to be equally common in Quebec and Labrador, but only the form with pale markings is known from the west coast of Hudson Bay. Forewing length varies from 13 to 17 mm. The male and female genitalia (Figs 23, 28) are similar to those of E. macleani (Figs 22, 27), but the appendix bursae in E. chimoensis projects mainly to the left, whereas in that of E. macleani has a lobe of the appendix bursae that projects posteriorly giving the appendix a longitudinal orientation.

Distribution and biology. Euxoa chimoensis is known only from two localities in Labrador, three in Quebec, and one in Manitoba, but these are widely scattered and indicate that the species is widely distributed in Labrador and northern Quebec and along the west coast of Hudson Bay. Adults have been collected throughout July.

Acknowledgments

We thank Jocelyn Gill (CNC, Ottawa) for assistance with the preparation of the genitalia and photographs. Paul Hebert and the staff at the Canadian Centre for DNA Barcoding, Biodiversity Institute of Ontario, University of Guelph, Guelph, Canada, provided data and information from the Barcode of Life Data (BOLD) system. Gary Anweiler and Chris Schmidt reviewed the manuscript and provided many helpful suggestions.