Studies in Mexican Grasshoppers: Four new species of Reyesacris Fontana Buzzetti & Mariño-Pérez, 2011 (Orthoptera: Acrididae: Ommatolampidinae) Author Mariño-Pérez, Ricardo 0000-0002-0566-1372 pselliopus@yahoo.com.mx Author Sanabria-Urbán, Salomón Author Pocco, Martina E. 0000-0002-3966-4053 martinapocco@fcnym.unlp.edu.ar Author Foquet, Bert 0000-0003-1643-6522 bert.foquet@gmail.com Author Song, Hojun 0000-0002-0566-1372 pselliopus@yahoo.com.mx text Zootaxa 2021 2021-09-17 5039 4 518 536 journal article 10.11646/zootaxa.5039.4.4 1175-5326 5516017 F1612814-C749-4F8E-8330-36061C859F4F 4. Reyesacris mephaa sp. nov. Mariño-Pérez, Sanabria-Urbán, Pocco, Foquet, & Song Figs. 2C & D , 6 , 12B Diagnosis. Hind margin of 10 th abdominal tergite with three small dark knobs. Male supra-anal plate with some small dark knobs. Tip of lophi and surrounded areas well sclerotized; sclerotized area ovoid in dorsal view. Dorsal margin of the sheath of aedeagus slightly “quadrated in lateral view, fused with dorsolateral projections of the dorsal aedeagal valves forming an apical groove. Apex of dorsal valves semicircular in dorsal view; anterior outer margin stout and concave. Dorsal and ventral aedeagal valves large and partially covered by sheath of aedeagus. Male description ( Fig. 2C & D ). External genitalia ( Fig. 6A ). Cerci triangular with internal spine in the basal half. Margin of 10 th abdominal tergite thickened and forming three black projections. Supra-anal plate triangular with dilated margins and some small dark knobs. Internal genitalia ( Fig. 6B–E ). Epiphallus ( Fig. 6B & C ). Well sclerotized, bridge almost straight, anterior projections globose and rounded. Ancorae triangular. Lophi prominent with an anterior portion and surrounding areas well sclerotized. Ovoid shape of this sclerotized area from dorsal view. Lateral plates poorly developed. Posterior projections enlarged. Oval sclerites semi-triangular. Ecto + Endophallus complex ( Fig. 6D & E ). Ectophallus. Apodemes of cingulum elongated. Zygoma well-developed. Rami well-developed. Sheath of aedeagus folded at tip with dorsal margin slightly “quadrated in lateral view. This dorsal margin fuse with the lateral-dorsal projections of the dorsal valvae of aedeagus forming an apical groove evident in lateral view of ectophallus. Endophallus. Apodemes of endophallus laterally compressed, arch of aedeagus elevated (“L shaped) (in lateral view). Dorsal valvae well sclerotized with dorsolateral quadrated projections (“anterior margins nearly perpendicular to body axis). Apex of the dorsal valvae semicircular in dorsal view with anterior outer margin stout and concave, involving laterally ventral ones. Ventral valvae a little longer than dorsal ones, semicircular and with expanded rounded apex. Both valvae large and only partially covered by sheath of aedeagus. Female description. Unknown. Etymology. This species is named in honor of the Me’phaa, also known as Tlapanecos, which is one of the most ancient indigenous people that remains in highlands southeastern Guerrero , where this new species was found. Male measurements (1). Pronotum length 3.85; tegmen length 3.33; hind femur length 9.34. Male holotype . Mexico , Guerrero , Iliatenco Centro Ecoturístico. L 18. 1308 m ( 17.0714°N ; 98.6726°W ) . 23- X-2017 . Legit. Mariño-Pérez, Sanabria-Urbán, Pocco, Foquet. UMMZ . Additional type material. One male paratype same data as above. CAFESI . Geographic distribution. Only known from its type locality ( Fig. 11 ) in the external versant of the Sierra Madre del Sur near the limits between the Guerrero and Oaxaca states. This species is found in mid elevations in association with cloud forests vegetation .