Monochorhynchus obscurus sp. nov.

urn:lsid:zoobank.org:act: 6BCE791D-3049-4218-8298-814EFFFD00D1

Figs 4–5, 8

Diagnosis

This species is easily separated from M. wahri by coloration, and from M. dehongensis sp. nov. by its dark brown coloration and straight anal apex in profile. In contrast, M. wahri with a brownish coloration and anal apex curved caudad in profile.

Etymology

The specific epithet is derived from Latin ‘ obscurus ’ (‘dark’, ‘shadowy’), referring to the predominantly dark coloration of the integument.

Type material

Holotype CHINA • ♂; Guangxi Zhuang Autonomous Region, Guilin City, Longsheng County, Huaping, Anjiangping; 2 Aug. 2006; Guo Hongwei leg.; NWAFU.

Paratypes CHINA • 2 ♂♂; same data as for holotype; NWAFU.

Description

MEASUREMENTS. Body length (incl. tegmen): male (N = 3) 12.2–12.4 mm; length of tegmen: male (N = 3) 10.7–10.9 mm.

COLORATION. Body generally dark brown (Fig. 4A–C). Vertex with lateral marginal carinae light orange, and disc dark brown with midline lighter, anterior margin light orange and posterior margin white (Fig. 4A). Frons dark brown, with clear white spot at middle of base, and column of small unclear spots on each inside of lateral marginal carinae, carinae light orange (Fig. 4B). Genae light orange, tinged dark brown around eye and antennal socket, white behind antenna and in ventrolateral angle (Fig. 4C). Clypeus dark brown, in frontal view, with short light orange stripe along basal quarter of median carina, three carinae brown (Fig. 4B); in lateral view, each lateral part with large white spot at base (Fig. 4C). Labrum white (Fig. 4B). Rostrum with second segment white at base and apex, gradually darker towards middle; apical segment dark brown (Fig. 4B–C). Eyes dark gray; ocelli light orange. Antennae dark brown with sensilla white (Fig. 4A–C). Pronotum dark brown, midline and margins yellow, each lateral part with two large lighter stripes behind eye, some yellow tubercles, and row of smaller yellow tubercles (Fig. 4A–C). Mesonotum brown, tinged darker between lateral carinae, with two longitudinal slightly lighter lines on lateral sides of median carina, and two white spots behind lateral angles; median carina yellow in anterior half and white in posterior half, lateral carinae generally yellow with dark spots at its anterior quarter, white spots at posterior third expanding inwards; scutellum yellow to light orange (Fig. 4A, C). Tegula dark brown (Fig. 4A–B). Tegmen generally dark brown, almost every apical cell with white spots adjacent to margins, basal half with large white region with fewer dark markings, delimited by MP, MP 2, subapical line, and postclaval margin, radial cell with four white spots, C2 with two white spots expanded posteriorly into circular shapes, subapical line with some white spots; veins mottled, mainly dark brown, with light orange spots (Fig. 4F). Wing semitransparent, tinged brownish in apical quarter, and brown along veins, with subquadrate dark brown near middle, from anterior margin to CuA 1, another one near base, from MP to A 1, and small oval brown spot at apex of CuA 2; veins dark brown (Fig. 4D). Legs yellowish, fore and middle legs with brown stripes on first three segments, tibiae and tarsi generally brown; hind leg lighter than first two legs, with slightly darker markings at apex of tibia (Fig. 4B–C, E). Abdomen dark brown on dorsal side with many small yellow spots, and lighter on ventral side (Fig. 4A, C).

HEAD AND THORAX. Vertex with width of base 2.6 × as long as length of midline (Fig. 4A). Antenna with pedicel about 2.3 × as long as widest portion, slightly constricted apically (Fig. 4A–C). Pronotum with small tubercles almost arranged in lines parallel with posterior margin (Fig. 4A, C). Mesonotum with few small tubercles along three carinae (Fig. 4A). Tegmina about 3.6 × as long as widest portion (Fig. 4F). Metatibiotarsal formula: 5-8-6 (Fig. 4E).

MALE GENITALIA. Anal tube triangular in dorsal view, with midline length about 1.9 × as long as basal width (excluding basal angles), apex obtusely angular, basal half with subquadrate ventral opening, lateral margin very slightly incised medially, becoming elevated and infolded posteriorly (Fig. 5B); in lateral view, basal third relatively straight, with two basal angles protruding ventrad and dorsal process protruding caudad before turning point, apical two thirds triangular and inclined ventrad, with dorsal margin relatively straight, paraprocts extending beyond apex of anal tube (Fig. 5A). Pygofer rectangular in ventral view, with medioventral process slight and obtusely angular (Fig. 5C). Gonostylus subrectangular in dorsal view, with apical process extending inwards, lamina sclerotized and C-shaped (Fig. 5E); in lateral view, with auricular process protruding outwards, acute and hirsutiusculus at apex (Fig. 5D); in caudal view, apical margin irregular, moderately concave in ventral quarter, with apical process broad-triangular at middle, and small angular process at dorsal third (Fig. 8D). Phallic complex robust and broad, in dorsal view, periandrium gourd-shaped, with left and right margins both double-arched, five characteristic processes: 1) elongate and sinuous process (P

1

) originating from mid-left margin, extending before right margin, with main portion curved caudad, apex acute and recurving cephalad; 2) broad and curved process (P 2) originating from mid-left margin, following apical portion of left margin, with apex acute and directed right-caudad, not reaching apex; 3) short and spinous process (P 3) originating from subapical right margin, extending caudad, with apex acute; 4) elongate and triangular process (P 4) originating from left apical dorsum, extending cephalad to middle, with apex gradually tapered; 5) broad and flat process (P 5) separated from P 4, originating from right apical dorsum, and extending cephalad to middle, with apex constricted and slightly curved rightwards (Fig. 5G). In lateral view, P 1 not arched dorsad basally, gradually tapered distad, P 2 curved dorsad basally, recurving caudad distally, P 3 extending beyond level of P 2 apex, P 4 very slender and P 5 broad-foliar, both extending dorsocephalad; endosoma large; aedeagus cylindrical and sclerotized at base (Fig. 5F, H).