Afroanthracites magamba, Hemp & Heller, 2019

Hemp, Claudia & Heller, Klaus-Gerhard, 2019, New Agraeciini species from the Eastern Arc Mountains, East Africa (Orthoptera: Tettigoniidae; Conocephalinae; Agraeciini), Zootaxa 4664 (3), pp. 301-338 : 313-315

Afroanthracites magamba n. sp. Hemp C.

( Figs. 18–20 , 39 , 42 , Table 1 )

Holotype male. Tanzania, West Usambara Mountains , Magamba Forest Reserve, 1800 m, February 2018. Depository: collection C. Hemp.

Further paratype material: 2 males, 1 female, same data as holotype, July 2017 and October 2018. Depository: collection C. Hemp.

Description. Male. General colour mix of dark and light brown, green and white ( Fig. 18 A, C ). On dorsum of pronotum in area of metazona large brown patch bordered by cream-white fasciae ( Fig. 18 C ). Head brown, genae green with black fascia bordered by white fasciae on face ( Fig. 18 D ). Abdomen green with median row of light brown to creamy patches bordered by thin dark brown lines ( Fig. 18 C ). Laterally beside these creamy patches segments green, venter of abdomen bright orange. Legs green with herringbone pattern on outer side. Near joints with tibiae black rings, joints white ( Fig. 18 A ). Head and antennae. Fastigium verticis conical, shorter than scapus. Labrum and mandibles orange, palpi white ( Fig. 18 D ). Antennae thick, long, more than twice the length of body, scapus green bordered black at proximal part, second antennomere reddish as remaining flagellum. Thorax. Pronotum rugose, rounded, posterior area (in metazona) slightly inflated. Tegmina hidden for most of their length under pronotum, only straight hind margins of tegmina visible. Fore coxa with stout spine. Fore and mid femora with 2–4 outer stout ventral spines, unarmed on inner sides. Hind femur with (3)–4 stout spines distally on outer side, inner side unarmed. Fore and mid tibiae with ventral double row of 4–5 spines and a pair of ventral spurs similar to other spines on tibiae. Hind tibiae with four rows of spines, distally more densely set; dorsally 1 pair of spurs, ventrally 2 pairs. Abdomen. Tenth abdominal tergite forming at posterior margin two tri-angle shaped lobes, these lobes of whitish colour and densely hairy. Posterior part of 10 th abdominal tergite black with some green ( Fig. 19 A, B ). Sub- genital plate elongated, processes posteriorly up-curved and v-shaped incised medially, with short styli ( Fig. 19 A ). Cerci laterally compressed with three branches, similar to A. pseudodiscolor ( Fig. 19 A ).

Female. Similar to male but larger ( Fig. 18 B ). Face as male. Brown patch on metanotum of pronotum not as large and conspicuous as in male. Venter of abdomen orange in living animal. Ovipositor stout, of reddish colour, slightly up-curved. Posterior margin of 10 th abdominal tergite forming two acute lobes ( Fig 20 A ). Subgenital plate broad, medially broadly u-shaped incised ( Fig. 20 B ).

Measurements, male (mm) (N = 3). Body length 20.3–22.4 Length of pronotum 8.8–9.4. Length of hind femur 10.0–11.5.

Measurements, female (mm) (N = 1). Body length 21.6. Length of pronotum 6.5 Length of hind femur 11.5. Ovipositor 10.2.

Song. The recorded males produced echemes with about eight syllables at intervals of about two and a half seconds. See Fig. 39 , 42 and Table 1 for details.

Diagnosis. See at A. pommeri n. sp.

Habitat. In understorey vegetation of closed montane forest. Recorded between 1700 and 2100 m.

Etymology. Named after the forest reserve Magamba in which this species occurs.

Figures

FIGURE 18. Afroanthracites magamba n. sp. A, C, D. Male in lateral and dorsal view and face with tri-angle shaped black fascia. B. Female.

FIGURE 19. Apex of male Afroanthracites magamba n. sp. A. preserved B. living specimen.

FIGURE 20. Female Afroanthracites magamba n. sp. A. Apex dorsal view with 10th tergite forming two acute lobes B. Subgenital plate of living specimen, medially broadly u-shaped incised.

FIGURE 39. Oscillograms of the calling song of Afroanthracites species.

FIGURE 42. Power spectra of the calling song of Afroanthracites, Afroagraecia and Dendrobia species. In A. guttatus the restricted frequency range is marked by a black line at its end.