. The Canadian field-naturalist. 562 The Canadian Field-Naturalist Vol. 105. Figure 1. A Northern Dusky Salamander, Desmognathus f. fuscus, found near Niagara Falls. Ontario. 23 April L989. Photograph by James Kamstra. mandcr or that both share some habitat requirement. The amphipod breeds in fast-flowing streams where water temperatures do not exceed 13°C (Williams and Moore 1982). but it is considered to be moder- ately tolerant of organic pollution (Hilsenhoff 1982). The salamander populations from the first locality appear to be in the cleanest remaining seepages in the Niagara Gorge, base
. The Canadian field-naturalist. 562 The Canadian Field-Naturalist Vol. 105. Figure 1. A Northern Dusky Salamander, Desmognathus f. fuscus, found near Niagara Falls. Ontario. 23 April L989. Photograph by James Kamstra. mandcr or that both share some habitat requirement. The amphipod breeds in fast-flowing streams where water temperatures do not exceed 13°C (Williams and Moore 1982). but it is considered to be moder- ately tolerant of organic pollution (Hilsenhoff 1982). The salamander populations from the first locality appear to be in the cleanest remaining seepages in the Niagara Gorge, based on water clarity, the pres- ence of moss, and the lack of odour. The Northern Dusky Salamander is readily distin- guishable as belonging to the family Plethodontidae by the presence ol a fine groove from the nostril to i(r- lip (naso labial groove) and from the two species in the family which have previously been collected in the area (Redback Salamandei and Spring Salamander, Gyrinophilus porphyriticus) by its low numbi i ni costal grooves (li) and theii robust build with hind legs markedly larger thai the fronl ones. The onl) other Plethodontidae which occurs neat the area with a similar build is the Mountain Dusk\ Salamander, Desmognathus ochrophaeus, which lias orded from adjacent New York State (Bishop 1941) bul this species has .i rounded tail, not markedly knife i dged above .it its base, and a mouth line which is sinuous, nol straighl {see Conanl and Collins 1991), Efforts to find furthei documentation foi Bishop (1943) have been unsuccessful. Bishop's herpeto logical collections, together with his extensive liter- ature card file on salamander distribution, were deposited in the Field Museum of Natural History after his death. Alan Resetar found neither speci- mens nor entry for an Ontario record in them (per- sonal communication to F. R. Cook. 17 October I1)1)!)). Fred Schueler (personal communication) had enquired at both the New York State Museum and the Buffalo
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