Euthyrrhachis, Brunner-Wattenwyl, 1878

Gorochov, A. V., 2018, Systematics of the American Katydids (Orthoptera: Tettigoniidae). Communication 8, Proceedings of the Zoological Institute of the Russian Academy of Sciences 322 (4), pp. 398-456 : 452

Euthyrrhachis ?consobrina

( Brunner-Wattenwyl, 1891)

( Figs 331–337 , 341–346 )

Material studied. PERU: 2 males, 1 female, Junin Department, Satipo Prov. , Rio Tambo Distr. , 6 km N of Pichiguia Vill., protected area “Reserva Comunal Ashaninka”, 11.358244°S, 74.0320473°W, ~ 500 m, primary forest, at light, 14–23 November 2017, A. Gorochov, G. Irisov ; 3 males, same province, ~ 25 km SE of Satipo Town , environs of Rio Venado Vill. , 11.11552°S, 74.46307°W, 1000–1200 m, primary/secondary forest, at light, 5–9 December 2017, A. Gorochov, G. Irisov ; 1 male, same data, but 20–23 October 2008, A. Gorochov, M. Berezin, L. Anisyutkin, E. Tkatsheva, V. Izerskyy ; 1 female, bank of Rio Morona approximately at middle of distance between its mouth and its Ecuadorian part, 200–300 m, primary forest, at light, 24–27 January 2010, A. Gorochov .

Note. This species determination is problematic because E. consobrina is insufficiently described. Nevertheless E. consobrina is a single species of this genus having the styles of male genital plate undoubtedly long ( Brunner-Wattenwyl 1891): styles of both E. griffini Cadena-Castaneda, 2015 and E. amazoniensis are unknown (missing in their type specimens). Thus, differences of the two latter species from E. consobrina are unclear, and all these congeners are described from the nearest regions: “Alto Amazonas” in Brazil for E. consobrina , and Colombia for the two other species. These circumstances allow me to determine the above-listed specimens only questionable; however, these specimens have at least one small difference from Colombian representatives: the posteromedian notch of male genital plate is comparatively less deep ( Figs 341, 342, 346 ). Body colouration of these specimens is yellowish (greenish in living condition) with greenish tinge, a pair of reddish stripes on disc along its lateral edges, and brown small areas on tympanal membranes. There are also some variations: the pronotal disc sometimes uniformly yellowish; stridulatory vein and stridulatory teeth are significantly or completely darkened in three males from environs of the Rio Venado Village ( Figs 335, 337 ), but in the other males, this vein is yellowish, and stridulatory teeth are only insignificantly darkened ( Figs 331, 333, 334 ); dorsal surface of fore tibia is often light brown with a brown area between its tympana, but sometimes this dorsal surface completely yellowish or only with a brown area between the tympana; male genital plate with the styles slightly varied in length, and with the posteromedian notch barely varied in depth ( Figs 342, 346 ). The structure of bodyparts is as in Figs 331–337 and 341–346 .

Figures

Figs 331–340. Euthyrrhachis Br.-W., male: 331–337 – possible E. consobrina consobrina (Br.-W.) from “Reserva Comunal Ashaninka” (331–334) and from environs of Rio Venado Vill. (335–337); 338–340 – E. c. elsol subsp. nov. Stridilatory apparatus of left (331, 335, 338) and right (332, 336, 339) tegmina; stridulatory vein of left tegmen from below (333, 334, 337, 340).

Figs 341–350. Euthyrrhachis Br.-W.: 341–346 – possible E. consobrina consobrina (Br.-W.) from “Reserva Comunal Ashaninka” (341–345) and from environs of Rio Venado Vill.(346); 347–350 – E. c. elsol subsp. nov.Male abdominal apex from above (341, 347), from below (342, 346, 349) and from side (348); distal part of right male cercus from above (343, 350); female genital plate from below (344); ovipositor from side (345).