Philmontis angustus, Ingrisch, 2022

Ingrisch, Sigfrid, 2022, Revision of the genus Philmontis Willemse, 1966 and description of a new genus Philmontoides gen. nov. from New Guinea (Orthoptera: Tettigoniidae; Conocephalinae), Zootaxa 5182 (2), pp. 101-151 : 110

publication ID	https://doi.org/ 10.11646/zootaxa.5182.2.1
publication LSID	lsid:zoobank.org:pub:8920DE84-2BE6-4A68-A7F7-AC987F1F894E
DOI	https://doi.org/10.5281/zenodo.7053877
persistent identifier	https://treatment.plazi.org/id/DB181868-FF91-FFC4-FF67-D2E728A7F7A9
treatment provided by	Plazi
scientific name	Philmontis angustus
status	sp. nov.

Treatment

Philmontis angustus sp. nov.

Figs. 1D View FIGURE 1 , 2D–F View FIGURE 2 , 4B–C View FIGURE 4 , 5B View FIGURE 5 , 6C View FIGURE 6 , 7C–E View FIGURE 7

Holotype (male): Papua New Guinea: Eastern Highlands, Mt Wilhelm , (5°48’S, 145°2’E), 14.x.1959, leg. J.H. Barrett —depository: Naturalis Biodiversity Center Leiden ( NBC). GoogleMaps

Other specimens studied: Papua New Guinea: Chimbu District, Mt Wilhelm, Keglsugl , elev. 2460 m (5°48’S, 145°2’E), 25.viii.1974, leg. A.D. Hart — 1 female ( BPBM) GoogleMaps ; Chimbu Province, Keglsugl , (5°50’S, 145°5’E), 16.x.1957 — 1 male ( NBC) GoogleMaps ; Eastern Highlands, Mt Wilhelm , (5°48’S, 145°2’E), 14.x.1959, leg. J.H. Barrett — 3 females, 2 female nymphs, 3 males (paratypes)( NBC) GoogleMaps ; Keglsugl near Mt Wilhelm , elev. 2500–2720 m (5°46’50.49’’S, 145°1’48.62’’E), 1.vii.1963, leg. J. Sedlacek — 1 female, 1 male ( BPBM) GoogleMaps ; New Guinea NE, Eastern Highlands, Mt Wilhelm, Keglsugl , elev. 2550–2750 m (5°48’S, 145°2’E), 10.viii.1969, leg. J.L. &. M. Gressitt — 2 females ( BPBM) GoogleMaps ; same locality, 11.viii.1969, leg. J.L. &. M. Gressitt — 2 females, 3 males (incl. 4 paratypes) ( BPBM) GoogleMaps .

Diagnosis. The new species is similar to P. nigrofasciatus Willemse, 1966 in general appearance, but slightly larger and more robust. It differs from this and other species of the genus by the simple and elongate male cerci that have the oval excavation of the internal surface and the ventral expansion of that area only faintly expressed, while in P. nigrofasciatus and other species with such an excavation there is a strong widening of the ventral margin of the cercus around that area. Also, the narrow, incurved and nearly straight apical area that carries two minute spinules is unique within the genus. Females of P. angustus sp. nov. differ from those of P. nigrofasciatus by the subgenital plate that has the subbasal lateral extensions at end widened and more strongly projecting lateral while the very basal area is narrower, and the apical projections are substraight and approaching each other posteriorly while in P. nigrofasciatus and P. murmur sp. nov. they are slightly sinuate and pointing posteriorly.

Description. Pronotum elongate, disc with anterior margin faintly concave, posterior margin broadly rounded. Prosternal spines short; mesosternal lobes obtuse; metasternal lobes rounded. Femora with the following number of spines on ventral margins: (1) 4-6 / 3-7; (2) 4-6 / 1-3; (3) 5-10 / 0 (n = 16); hind knee lobes unispinose.

Male. Stridulatory file (n = 2): total length 1.16-1.17 mm; area with countable teeth 0.98–1.00 mm with 53–62 teeth; from base to end of distinct area 0.82–0.90 mm with 38–52 teeth; area with distinctly spaced, including largest teeth 0.43–0.49 mm with 19–21 teeth ( Figs 4B–C View FIGURE 4 ). Tenth abdominal tergite wider than long, hind margin wideroundly excised in middle for about one third the length of the tergite, obtuse angularly projecting on both sides of excision ( Fig. 2D View FIGURE 2 ). Cerci in about first third of straight basal area cylindrical, afterward moderately widening ventrad and with concave internal surface, then strongly narrowing into a long, at base compressed, afterward subcylindrical projection curved mediad or little medio-proximad, at end rounded and provided with two minute spinules: one at and one little before tip ( Figs 2 D–F View FIGURE 2 ). Subgenital plate triangularly excised from base, with a faint medial carinula; ventral disc with converging margins that are curved dorsad and then laterad forming compressed lateral expansions with rounded margin; central disc in apical area with swollen lateral margins that are extended into long, rounded projections that carry at end minute styli. Titillators narrow throughout, curved in basal area and in apical area, at tip with a small rounded disc ( Fig. 5B View FIGURE 5 ). Phallus forming a membranous fold above apical parts of titillators.

Female. Subgenital plate with a very fine membranous seam along midline; at base narrow, swollen and widening into compressed and elevated lateral expansions that are widening toward both sides at subtruncate dorsal end; behind expansions plate with approaching margins, upcurved on both sides, terminating into a little concave apical margin, but on both sides prolonged into long projections with converging margins and slightly wavy surface ( Figs 7C–E View FIGURE 7 ).

Coloration. Vertex with fastigium verticis and bands behind eyes medium to dark brown. Abdominal tergites completely blackish brown. Postfemur with apical third (males) or hind knees only (females) blackish brown. Female subgenital plate blackish brown, lateral projections of light color: in some specimens black with yellow basal, lateral area, in others plate uniformly brown or greenish varying between specimens.

Measurements (8 males, 10 females).—Body w/wings: male 23–25, female 26–31; body w/o wings: male 20.0– 24.5, female 18–25; pronotum: male 7.2–10.0, female 6.2–7.8; tegmen: male 15.5–20.5, female 17.5–21.5; hind femur: male 14.5–18, female 14.8–19.0; antenna: male 82, female 70–85; ovipositor: female 10.0– 12.5 mm.

Etymology. The new species is named for the narrow apical half of the male cercus, from Latin angustusnarrow.