New Species Of Tyloperla (Plecoptera: Perlidae) From Vietnam And Thailand Author Stark, Bill P. Box 4045, Department of Biology, Mississippi College, Clinton, Mississippi, U. S. A. 39058 Author Sivec, Ignac Slovenian Museum of Natural History, Prešernova 20, P. O. Box 290, SLO- 1001 Ljubljana, Slovenia text Illiesia 2005 2005-01-25 1 1 1 7 journal article http://doi.org/10.5281/zenodo.4758557 e094e473-f8d3-49f6-8d86-49ad57e85df0 1854-0392 4758557 Key to Tyloperla Males ( T. sauteri and T. sinensis not included) 1. Aedeagal sac with a pair of basolateral lobes ( Fig. 13 )………………………………………………...2 Aedeagal sac tubular, basolateral lobes absent ( Fig.18 ).........………………………………....... T. khang 2. Tergum 8 without a distinctly produced mesal lobe ( Fig. 2 )……………………………………………3 Tergum 8 with a distinctly produced,esal lobe ( Fig. 11 )………………………………………….……..4 3. Basal cushion of hemitergal lobes more than half as long as inner length of process; aedeagal sac with largest spines forming a band distal to small ear shaped lobes; known from Taiwan ……….……………………………. T. formosana Basal cushion of hemitergal lobes about 1/3 as long as inner length of process ( Fig. 2 ); aedeagal sac with largest spines forming a dense subapical patch ( Fig. 4 ); known from Thailand ……………………………………………… T. courtneyi 4. Hemitergal processes slender throughout length and reaching well beyond hind margin of tergum 9……………………………….….. T. attenuata Hemitergal processes broad at base and reaching, at most, hind margin of tergum 9.……………………………………………………….…5 5. Aedeagal sac armature continuous laterally near base of lobes ( Fig. 13 ); apical region of aedeagal sac offset by a subapical groove ( Fig. 13 ); known from Vietnam ……………………………………. T. illiesi Aedeagal sac armature divided laterally near base of lobes into two patches; apical region of aedeagal sac without subapical groove; known from Assam……………………………………..… T. schmidi