Zebragryllus fuscus Desutter-Grandcolas, n. sp.

(Figs 2 D, J, 3F, 4G, H, 7A–D).

http://lsid.speciesfile.org/urn:lsid: Orthoptera .speciesfile.org:TaxonName:464245

Type locality. Peru, Ampiyacu, Brillo Nuevo.

Type material. Holotype: Peru, Région de l’Ampiyacu, en aval du confluent des rios Zumun et Yahuasyacu, Brillo Nuevo, 1 male, 28.x.1985, parcelle K 13 ans (10 ans après abandon, chasse jour, L. Desutter, MNHN-EO- ENSIF 3185. Paratype: 1 male. Same data as the holotype, 1 male, 26.x.1985, MNHN-EO-ENSIF3186.

Diagnosis. Wholly dark species, with a faint lighter band (never whitish and contrasted) along the outer, lower margin of hindfemora (Fig. 3 F). Male: FW mirror wider than long, distinct although divided into several distal cells (Fig. 2 D); stridulatory file with about 112 teeth (n=1). Male genitalia: Pseudepiphallic sclerite more elongate and narrow than in “zebra” species (Fig. 4 G), its anterior margin deeply concave, the median lophi short and the lateral lophi dejected laterally (Fig. 4 H); pseudepiphallic parameres going beyond lateral lophi; ectophallic fold short, not reaching the paramere distal margin; ectophallic apodemes not very long; endophallic apodeme almost vertical between ectophallic apodemes.

Distribution. Western Amazonia, Peru (dept. Loreto).

Etymology. Species named after its dark pattern of coloration.

Description. In addition to the characters of the genus. Scapes and base of antennae (30–33 antennomeres) light brown, before a short white ring (9–10 antennomeres). Basitarsomeres III with 4–5 inner (mean 5) and 6–7 outer (mean 6) dorsal spines, in addition to apical ones. Coloration wholly dark brown to black, the pronotum the darkest; legs a little lighter, with a lighter, reddish brown, band along FIII outer margin (Fig. 3 F); head dark reddish brown (HT) or black (PT), with a lighter area above epistemal suture; maxillary palpi wholly brown.

Male. FWs covering subgenital plate tip. Mirror distinct, subdivided into several cells (Fig. 2 D). Subgenital plate shorter and higher than in other species of the genus (Fig. 2 J).

Male genitalia. Pseudepiphallic sclerite wider than long; distance between the inner base of median lophi and their connection to lateral lophi more than twice their own length (Fig. 4 G); median lophi about as long as lateral lophi; in lateral view, median lophi with a thumb-like upper process, and a squared lower process (Fig. 4 H); lateral lophi acute, much shorter than the pseudepiphallic parameres (Fig. 4 H); ectophallic fold regularly narrowed toward apex.

Female. Unknown.

Measurements (in mm).

Remark. Males taken in the same area as the holotype but in an older cultivated plot (23 years old after being abandoned) or in mature forest (Monte alta) show distinct genitalia, with shorter median lophi, and a more contrasted pattern of coloration, which could justify describing them as a distinct species. Females from the same plots have a short subgenital plate with acute distal angles (Fig. 7 A, B) and a very distinct copulatory papilla, subrectangular with concave distal margin (Fig. 7 C, D).

Specimens examined. Same data as the holotype, but: parcelle I, 23 ans (20 ans après abandon), 1 male, 23.x.1985, piège détergent, nuit; parcelle J, 53 ans (50 ans après abandon), 1 female, 23.x.1985, jour, 1 female, 25.x.1985, piège détergent nuit; 1 female, 12.xi.1985, parcelle R, 18 ans (15 ans après abandon), piège détergent nuit; monte alta [parcelle] E, 1 male, 1 female, 10.x.1985, jour, 1 female, 11.x.1985, jour, L. Desutter. MNHN.