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[A new genus for Chirosia hirtipes Stein, and a reassessment of Heterostylodes Hennig (Diptera: Anthomyiidae), Sex proportions, flight periods and morphometric variation in West Norwegian Apatania zonella (Zetterstedt, 1840) (Trichoptera: Limnephilidae)]

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[Boreophorbia hirtipes (Stein, 1907), new genus and new combination, is a tiny anthomyiid occurring in subarctic and montane zones of the Holarctic. It was previously treated in Chirosia Rondani, but evidence is provided that hirtipes belongs to the Delia group of genera, and that Boreophorbia (monobasic) is the sister group of Phorbia Robineau-Desvoidy. Heterostylodes Hennig, the alledged sister group of Phorbia + Boreophorbia, is reassessed. 9 species are recognized in Heterostylodes, among them annularis (Tiensuu, 1946), caledonica (d'Assis Fonseca, 1966), laevis (Stein, 1898) and nuditibia (d'Assis Fonseca, 1966), new combinations. H. obscura (Macquart, 1835) is a valid senior name for denigrata (Zetterstedt, 1845), new synonymy. Delia ricta (Ackland, 1971), new combination, is removed from Heterostylodes., Apatania zonella is an accidental or facultative parthenogenetic species; the percentage of males observed in various West Norwegian populations ranges from 0% to 5.2%. On the Hardangervidda mountain plateau (over 800 m a.s.l.), the species has a flight period from late June to mid-September, and supposedly has a two year life cycle. In the western lowlands the species has a bimodal flight pattern: the first flight period is from mid-May to late June, the second flight period from early August to late October. Females with mature eggs have been taken during both flight periods, and the species supposedly has two more or less separate cohorts each with a one year life cycle. Morphometric variation of A. zonella in seven West Norwegian populations was studied using multivariate statistical methods. Specimens collected in three lowland populations in June were found to differ from specimens collected in the same populations in autumn, but they were obviously more similar to autumn specimens from the same locality than to specimens from the other localities. Most of the samples from the lowlands collected in autumn and the samples from the mountainous eastern areas were found to differ significantly. The specimens from the eastern mountain populations were generally larger than the specimens from the western lowland populations. Clinal shape variation was established, following more strongly a west - east gradient than an altitudinal gradient. The specimens in the eastern populations had generally smaller eyes, narrower heads and longer, narrower front wings.]


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