. Bulletin. Natural history; Natural history. September, 1942 Prison : North American Plecoptera 311 outer posterior corner of the submentum is suggestive of an atrophied submental gill. No true submental gill. Nymphal and exuvial records are as fol- lows. North Carolina.âBalsam: Same data as for holotype, 4 nymphs, 9 exuviae. Willetts: March 23, 1940, T. H. Prison, C. O. Mohr & A. S. Hawkins, 6 nymphs. Tennessee.âElkmont, Little River: May 14, 1939, T. H. Prison & H. H. Ross, 9 exuviae. Gatlinburg, Le Conte Creek: May 14, 1939, T. H. Prison & H. H. Ross, 2 exuviae. I have been abl
. Bulletin. Natural history; Natural history. September, 1942 Prison : North American Plecoptera 311 outer posterior corner of the submentum is suggestive of an atrophied submental gill. No true submental gill. Nymphal and exuvial records are as fol- lows. North Carolina.âBalsam: Same data as for holotype, 4 nymphs, 9 exuviae. Willetts: March 23, 1940, T. H. Prison, C. O. Mohr & A. S. Hawkins, 6 nymphs. Tennessee.âElkmont, Little River: May 14, 1939, T. H. Prison & H. H. Ross, 9 exuviae. Gatlinburg, Le Conte Creek: May 14, 1939, T. H. Prison & H. H. Ross, 2 exuviae. I have been able to associate the nymph of this species with its adult because of a mature male nymph which clearly shows the distinctive structural features of the adult about to emerge and which was col- lected at the same time and place as the holotype. The terminal abdominal struc- tures of the male are much different from those of any other species of this genus known to me. Among the Diploperla (), as I am now recognizing this genus, this new species differs from duplicata (Banks) and bilohata (Needham & Claas- /â. / Fig. 84.âNymph of Diplopcrla arina. sen) in the male in lacking the lobes on terminal abdominal sternites. It differs from another complex of species, including verticalis (Banks), in lacking the heavily sclerotized lateral stylets flanking the supra-anal process. ISOPERLIDAE The family placement of the genus hoperla presents several problems. Need- ham & Claassen (1925), following many other workers, have placed this genus in the family Perlidae, and there are several reasons for so doing. In my \9i5a paper on Illinois stoneflies, I placed hoperla in the family Chloroperlidae, chiefly because of its lack of gills in nymphs or of gill remnants in adults. In addition to having characters in common with the Perlidae, the genus hoperla {) has characters also in common with the Perlodidae. It now seems desirable to me to erect a special family for this genus
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