. The Canadian field-naturalist. 1989 HARPER: ZOOGEOGRAPHICAL RELATIONSHIPS OF AQUATIC INSECTS 537 Shield (SH) Northeastern (NE) V-Northern trans- ^„ continental \ (NT) X. Cordilleran (CD. Continental (CT) Appalachian (AP) Figure 2. Distribution patterns used in this study (with abbreviations) superposed on a map of North America. Ephemeroptera Fifty species were collected of which 48 can be named (Table 1). Only one endemic element, Caenis Candida (species number 44), was discovered (Harper and Harper 1981). Three of the species are Holarctic (2, 6, 35), one is northern transcontinental (1),
. The Canadian field-naturalist. 1989 HARPER: ZOOGEOGRAPHICAL RELATIONSHIPS OF AQUATIC INSECTS 537 Shield (SH) Northeastern (NE) V-Northern trans- ^„ continental \ (NT) X. Cordilleran (CD. Continental (CT) Appalachian (AP) Figure 2. Distribution patterns used in this study (with abbreviations) superposed on a map of North America. Ephemeroptera Fifty species were collected of which 48 can be named (Table 1). Only one endemic element, Caenis Candida (species number 44), was discovered (Harper and Harper 1981). Three of the species are Holarctic (2, 6, 35), one is northern transcontinental (1), and eight continental (9, 11, 12, 31, 33, 46, 48, 49). The rest have an eastern distribution, most of these of type MS; some are Appalachian (5, 15, 28, 30, 40, 42, 50; Siphloplecton basale (5), though Appalachian, extends to the northwest to the Rockies). Finally one species (43) has a more south-central distribution (CN). By comparison with other northeastern sites, the fauna is rich (45 species in sb and 25 in si); about half the species are shared with the two southern sites (25/45, 11/25). Seven of the 11 species found at mf also occur in our list. Fourteen species are exclusive to jb; of these, six are of particular interest and most are boreal (1,3, 5, 6, 38, 39), particularly Metretopus borealis (6) and Ameletus subnotatus (1). On the basis of early surveys (Harper et al. 1975; Harper and Harper 1981), other boreal elements, such as Par ameletus spp. and Rhithrogena jejuna Eaton, would have been expected. No truly arctic species, such as Baetis macani bundyae Lehmkuhl and other specialized baetids (Harper and Harper 1981), were encountered. Plecoptera Twenty-two species (21 named) were found in the area. All are common, except a species (designated as Cultus cf. aestivalis (Needham and Claassen) by Stark et al. 1988) of Cordilleran affinities. None of the species is Holarctic, and 3 are northern transcontinental (51, 54, 62). All the other species are restricted to th
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