Perlomyia honshu, Sivec & Stark, 2012

Sivec, Ignac & Stark, Bill P., 2012, Seven New Species Of Perlomyia (Plecoptera: Leuctridae) From Japan, Illiesia 8 (7), pp. 94-103 : 96

Perlomyia honshu sp. n.

( Figs. 4-7 )

Material examined. Holotype ♂, Japan, Nara Prefecture, Takami River, Aritoshi , 15 April 1995, Y. Isobe ( PMSL) . Paratypes: 1♂, 3♀, same data ( PMSL). Male. Forewing length 7-7.5 mm. General color dark brown to black. Epiproct almost straight in lateral aspect, but with small tab-like triangular tip ( Fig. 6 ). Tergum 9 broadly excavated posteromesally; tergum 10 with small rounded knobs placed near center of sclerites ( Figs. 4, 6 ). Cerci somewhat globular in dorsal aspect, apex truncate or slightly rounded in lateral aspect and without conspicuous dorsobasal lobe or apical spine. Paraprocts fused into a broad, thick process ( Figs. 4, 6 ). Sternum 9 prolonged beyond paraprocts and curved gently upward ( Figs. 5-6 ). Vesicle almost circular in outline.

Female. Forewing length 8-8.5 mm. Posterior margin of sternum 7 slightly produced over base of sternum 8, projecting portion relatively well sclerotized ( Fig. 7 ). Sternum 8 with a narrow, mesal membranous strip which separates dark median sclerites; lateral wing-like sclerites narrowly separated from median sclerites.

Larva. Unknown.

Etymology. The species name, used as a noun in apposition, is based on Honshu Province where it was first collected.

Diagnosis. Perlomyia honshu is one of four Japanese species with small knobs on male tergum 10. Two of these, P. kappa and P. parva , have an apical spine visible in lateral aspect on the male cerci, and in P. iwate , the epiproct tip is not enlarged.

Figures

Figs. 4-7. Perlomyia honshu terminalia. 4. Male dorsal. 5. Male ventral. 6. Male lateral, epiproct tip inset. 7. Female ventral.