Ptosoproctus Shen, Yin & He, 2021

Shen, Zi-Hao, Yin, Zi-Xu, Lee, Michael, Liu, Yi-Jiao, He, Zhu-Qing, Wang, Zi-Fan & Wang, Tong-Xin, 2021, Ptosoproctus gen. nov., a new genus with two new species of Shield-back Katydid with the first record of genus Eulithoxenus Bey-Bienko, 1951 from China (Orthoptera: Tettigoniidae: Tettigoniinae: Drymadusini), Zootaxa 5067 (4), pp. 548-568 : 550-551

Genus Ptosoproctus Shen, Yin & He gen. nov. 折尾ỡffl

Type species. Ptosoproctus lanzhouensis Shen, Yin & He , here designated

Description. Body small. Fastigium of vertex distinctly wider than scape of antenna. Disc of pronotum with a broadly obtuse concavity in the middle on both sides, lateral carina faintly indicated, lateral lobes longer than high, with weakly humeral sinus. Prosternum unarmed. Brachypterous, tegmina around same length as pronotum in male; distinctly shorter than pronotum and only reaches 1 st abdominal tergite anterior margin, clearly visible and discontiguous dorsally in female. Fore-tibiae dorsally without internal spines; mid-tibiae dorsally with spines on both sides. Male 10 th abdominal tergite fused with epiproct, forming a down-folded membranous projection on tergite posterior margin, projection with a median longitudinal furrow. Cercus short and stout, apex short and obtusely conical; inner tooth near cercus apex, robust, recurved and apically acute. Subgenital plate with short styli. Titllators bear a row of denticles on the apical arms. Female cercus conical and pielous, 10 th abdominal tergite fused or not fused with epiproct, posterior margin with a median notch. 7 th abdominal sternite without hump or tubercule. Subgenital plate posterior margin with a median deep, acutely angled concave. Ovipositor shorter than hind femora, distinctly upcurved.

Remarks. This new genus is closely related to Eulithoxenus but differs from the latter by: male 10 th abdominal tergite fused with epiproct, and female 7 th abdominal sternite without hump or tubercle. This new genus is also closely related to Novadrymadusa as indicated by the confluent epiproct, but differs from latter by: prosternum unarmed, male epiproct not strongly extended posteriorly, in the middle without 4 cross-shaped contiguous plates, and female 7 th sternite without an acute, spine-like projection posteriorly.

Etymology. The new genus name refers to the Greek prefix “πτώσ-” (ptôs-, falling) and Greek “πρωκτός” (prôktós, anus), representing the down-folded epiproct.