This revision recognizes 13 species of Stilpon Loew in the Nearctic Region, including nine new species. A key is provided for the identification of adult specimens, all species are described, and their geographical distributions are mapped. Two informal species groups are recognized in the Nearctic Region, with the following included species: (1) S. graminum group — S. campestris Cumming sp.nov. (type-locality Assiniboia, Saskatchewan, Canada); (2) S. varipes group — S. chillcotti Cumming sp.nov. (type-locality 10 km E Evergreen, Alabama, USA), S. ctenistes Cumming sp.nov. (type-locality Salmon Creek, New York, USA), S. curvipes Melander, S. limitaris Cumming sp.nov. (type-locality Sapelo Island,Georgia,USA), S. pauciseta Melander, S. pilomus Cumming sp.nov. (type-locality Franconia, New Hampshire, USA), S. spinipes Melander, S. tribulosus Cumming sp.nov. (type-locality Gatlinburg, Tennessee, USA), S. tyconyx Cumming sp.nov. (type-locality Bedford, Massachusetts, USA), S. varipes Loew, S. vockerothi Cumming sp.nov. (type-locality Ottawa, Ontario, Canada), and S. wirthi Cumming sp.nov. (type-locality Dennisport, Massachusetts, USA). A world list of described species of Stilpon, including synonyms, is provided. Stilpon pectiniger Melander is a new junior synonym of S. varipes Loew and S. demnatensis Vaillant is indicated as a nomen nudum. Stilpon pleuriticus Melander, previously considered to belong within Stilpon, is excluded from the genus, and S. obscuripes Adams is transferred as Crossopalpus obscuripes (Adams) comb.nov. Lectotypes are designated for S. pauciseta Melander and S. pectiniger Melander. Homologies of previously confused structures of the male and female terminalia are summarized with reference to other Empidoidea. The monophyly of Stilpon is justified, including discussion of the phylogenetic relationships of the genus to the remainder of the Tachydromiinae. All described species of Stilpon, including extralimital species, are assigned to one of three proposed informal species groups (S. divergens, S. graminum, or S. varipes group), and zoogeographic patterns are discussed.
Eighteen parasitoid species were found associated with obliquebanded leafroller, Choristoneura rosaceana (Harris), and three-lined leafroller, Pandemis limitata Robinson, from 1982 to 1984, on apple and other host plants in the southern interior of British Columbia. The leafroller parasitoids included a Glypta Gravenhorst species (Hymenoptera: Ichneumonidae), Diadegma eureka (Ashmead) and Diadegma interruptum pterophorae (Ashmead) (Hymenoptera: Ichneumonidae), and Hemisturmia tortricis (Coquillett) (Diptera: Tachinidae). The two leafroller species were found on 18 wild host plants from 10 plant families.
Cyzenis Robineau-Desvoidy is a member of the Goniini, a tribe characterized by the production of microtype eggs in adult females. A new concept of Cyzenis is proposed based on a synapotypic character state of adults, i.e. the presence of narrowly separated discal scutellar setae. Two monophyletic species groups are recognized, containing a total of five species in the Nearctic Region: the albicans-gcoup with C. albicans (Fallén) (a species introduced to North America from Europe), C. pullula (Townsend), and C. browni (Curran); and the incrassata-graup with C. incrassata (Smith) and C. ustulaia (Reinhard). A Palearctic species, C. jucunda (Meigen), is recognized as a member of the albicans-group. Phorocera anassa Reinhard is newly synonymized with C. incrassata. Phorocera festbums Aldrich and Webber, Phorocera mitis Curran. and Phorocera regilla Reinhard are transferred from Cyzenis to Eufrontina Brooks (new combinations). A lectotype is designated for C. albicans (Fallén). Nearctic species of Cyzenis are keyed and redescribed, their distributions are mapped, and external, terminate, and puparial features are illustrated. Distinction of individuals of C. albicans and C. pullula is discussed in relation to ecological studies on die host–parasite pair of C. albicans and the winter moth, Operophtera brumata (Linnaeus) (Lepidoptera: Geometridae).
Can. Ent. 121: 565-568 (1989) Micrempis anatolica Chillcott is considered a junior subjective synonym of M. bomboxynon Chillcott, based on re-examination of purported differences in the female terminalia given by Chillcott and Teskey (1983), as well as examination of a number of additional specimens collected from eastern North America. As a result of its new broader concept, M. bomboxynon is redescribed, a distribution map of the species is provided, and separation from other Nearctic species of Micrempis is discussed. Micrempis anatolicaChillcott est considCr.6 comme un synonyme subjectif secondaire de M. bomboxynon Chillcott d'apr5s un rkxamen de pdtendues diffkrences dans les terminalia femelles donnkes par Chillcott et Teskey (1983), ainsi que d'ap&s I'examen d'un cert+n nombre de sp6cimens supplkmentaires rkcoltks dans I'est de 1'Amkrique du Nord. A cause de l'acception Clargie de M. bomboxynon, les auteurs le redkcrivent, foumissent une carte de distribution de l'es@ce et discutent de sa diffkrenciation d'autres espkces nkarctiques de Micrempis.
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