. The Canadian field-naturalist. 538 The Canadian Field-Naturalist Vol. 103 55°N. Figure 3. The James Bay drainage. The interrupted line around the Bay indicates the extension of the Tyrrell Sea. The comparison sites are also indicated: al: Algonquin Park, jb: this study, mf: St. Martin Falls, Albany River, mt: riviere Matamek, sb: Station de Biologie (St-Hippolyte), si: St. Lawrence River, tr: Mont Tremblant Park. ians (Banks), Isoperla montana (Banks), Alloperla concolor Ricker, Suwallia marginata (Banks), Sweltsa naica (Provancher), S. onkos Ricker from Ricker et al. (1968). No truly arctic
. The Canadian field-naturalist. 538 The Canadian Field-Naturalist Vol. 103 55°N. Figure 3. The James Bay drainage. The interrupted line around the Bay indicates the extension of the Tyrrell Sea. The comparison sites are also indicated: al: Algonquin Park, jb: this study, mf: St. Martin Falls, Albany River, mt: riviere Matamek, sb: Station de Biologie (St-Hippolyte), si: St. Lawrence River, tr: Mont Tremblant Park. ians (Banks), Isoperla montana (Banks), Alloperla concolor Ricker, Suwallia marginata (Banks), Sweltsa naica (Provancher), S. onkos Ricker from Ricker et al. (1968). No truly arctic element ( Capnia sugluka Ricker) was encountered, but 6 mostly boreal species (51, 56, 61, 64, 65, 66) did not occur in the southern comparison sites. Trichoptera The caddisfly list contains 148 species, which represents about half of those known from Quebec (Roy and Harper 1979). Few seem to be endemic; Oxyethira burnstoni Harper has been shown to be Holarctic (- O. mirabilis Morton, fide Kelley 19X2); Goera radissonica Harper and Methot is still considered a valid species (Schmid 1983). Twelve of the species are Holarctic and most of these are northern transcontinental; 38 others are northern Nearctic transcontinental, 8 of which have disjunct distributions (NTd), but in most species this is probably due to insufficient collecting. Twenty more are continental (CT). Some 47% of the species belong to a fauna widely distributed over at least the northern half of the continent. The others (47%) are typically eastern, again with a majority from the Mississippi-St. Lawrence fauna (36 species). Few are Appalachian (75, 77, 78, 129, 179 in part, 180, 217). One, Wormaldia gabriella (84), is Cordilleran. Affinities with other subarctic faunas (mf and mt) are high with some 80% of species in common (25/31 at mf, 39/46 at mt). Similarity with more southerly sites is lower, generally of the order of 50% or less (26/52 at al, 76/170 at tr, 88/180 at sb, 37/99 at si). By comparison wi
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