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  • Laurent LeSage

The taxonomy of the Nearctic genus Ophraella Wilcox is revised. Data for all known immature stages are included. Ophraella integra (LeConte) is synonymized with O. notulata (Fabricius). Ophraella dilatipennis (Jacoby) is transferred to the genus Neolochmaea Laboissière.Thirteen species are recognized, of which 6 are new : O. arctica, californiana, communa, macrovittata, nuda, and pilosa. The distribution and host plants of species are as follows : O. americana, eastern North America, on Solidago spp.; O. pilosa, transcontinental along the Canadian border, on Aster, primarily A. macrophyllus; O. cribrata, coast to coast in the United States, on Solidago of the subgenus Virgaurea; O. conferta in northeastern states, on Solidago with preference for S. canadensis and S. rugosa; O. sexvittata in southeastern states, on Solidago spp.; O. notulata in eastern US and Gulf states to Mexico, on Iva oraria; O. notata in eastern portion of the United States, on Eupatorium perfoliatum; O. macrovittata in the Gulf states, host plant unknown; O. communa in North America and Mexico, on Ambrosia artemisiifolia; O. bilineata in the Canadian Prairies and the bordering states, on Chrysopsis villosa; O. californiana in California and Mexico, on Artemisia Douglasiana; O. nuda in Alberta, host plant unknown; and O. arctica in tundra zone, on Solidago multiradiata scopulorum.The life cycles of most species are still unknown but most species probably have only 1 generation per year. The eggs are laid in clusters on the under surface of young leaves. The larvae skeletonize young leaves and live exposed. Before pupation, the larva spins a loose cocoon and attaches it to a leaf tip. Pupation lasts 1–2 weeks. The newly hatched adults are active on host plants until the early fall, when they enter the leaf litter for overwintering.

L'auteur révise la taxonomie du genre néarctique Ophraella Wilcox et discute celle de tous les stades de développement connus. Ophraella integra (LeConte) devient synonyme de O. notulata (Fabricius). Ophraella dilatipennis (Jacoby) est transférée au genre Neolochmaea Laboissière.

L'auteur décrit 13 espèces dont 6 nouvelles : O. arctica, californiana, communa, macrovittata, nuda et pilosa. Les répartitions géographiques et les plantes-hôtes des espèces sont les suivantes : O. americana dans l'est de l'Amérique du Nord, sur Solidago spp.; O. pilosa d'un océan à l'autre, sur Aster, principalement A. macrophyllus; O. cribrata d'un océan à l'autre aux Etats-Unis, sur Solidago du sous-genre Virgaurea; O. conferta dans les états du nord-est, sur Solidago avec préférence pour S. canadensis et S. rugosa; O. sexvittata dans les états du sud-est, sur Solidago spp.; O. notulata dans les états du Golfe du Mexique, sur Iva oraria; O. notata dans la partie nord-est des Etats-Unis, sur Eupatorium perfoliatum; O. macrovittata dans les états du Golfe du Mexique, plante-hôte inconnue; O. communa en Amérique du Nord et au Mexique sur Ambrosia artemisiifolia; O. bilineata dans les Prairies canadiennes et les états avoisinants, sur Chrysopsis villosa; O. californiana en Californie et au Mexique, sur Artemisia Douglasiana; O. nuda en Alberta, plante-hôte inconnue; O. arctica dans la toundra boréale, sur Solidago multiradiata scopulorum.

Le cycle biologique de la plupart des espèces est encore inconnu, mais vraisemblablement la plupart d'entre elles n'ont qu'une génération par année. Les oeufs sont pondus en groupes sur la surface inférieure des feuilles. Les larves sont épigées et s'alimentent des parties tendres du bout des feuilles ne laissant que les nervures. Avant la nymphose, elles tissent un cocon lâche qu'elles attachent au bout des feuilles; la nymphose dure environ 1–2 semaines. Les adultes nouvellement éclos passent leur temps sur la plantes-hôtes jusqu'au début l'automne, moment où ils entrent en hibernation dans la litière.

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