Otiocerus rubilineata, Chen & Dietrich & Zhang, 2025

Otiocerus rubilineata sp. nov.

( Figures 1–25 View FIGURES 1–6 View FIGURES 7–13 View FIGURES 14–19 View FIGURES 20–25 )

Measurements. Body length: male (incl. tegmen): 8.5 mm (except tegmen: 4.6 mm); tegmina expanded: male: 12.8 mm.

Color. Body generally brown ( Figs 1, 4 View FIGURES 1–6 ). Head brown, in dorsal view, lateral marginal carinae of vertex brownish, disc ivory ( Fig. 2 View FIGURES 1–6 ); in lateral view, with a red line below dorsal margin, and a brownish yellow band above ventral margin, rest part brown ( Figs 1, 3 View FIGURES 1–6 ); in ventral view, lateral marginal carinae of frons dark brown, with small light spots throughout ( Fig. 4 View FIGURES 1–6 ). Postclypeus pale, with median carina slightly darker ( Fig. 4 View FIGURES 1–6 ). Rostrum pale, with apical segment slightly darker. Eyes dark gray. Antennae with pedicel brown, with black tubercles, appendages rather lighter ( Figs 1–4 View FIGURES 1–6 ). Pronotum dark brown, with a light band at middle and another light one on each side behind dorsal margin of eyes ( Figs 2, 3 View FIGURES 1–6 ). Mesonotum ivory at middle and dark brown at lateral parts, with a longitudinal median carina and two lateral carinae light orange ( Fig. 6 View FIGURES 1–6 ). Tegmina pale grey, with brown to dark brown patches on each cell, stain-like, darker large one of which obviously on cubital cell, and darker ones on apical cells below subapical line and at apical margin of tegmina, anterior margin red in apical part, veins brown or darker ( Figs 1 View FIGURES 1–6 , 7 View FIGURES 7–13 ). Wings pale without obviously marks, veins brown ( Figs 4 View FIGURES 1–6 , 8, 9 View FIGURES 7–13 ). Legs generally white to brownish. Abdomen generally orange on dorsum and ivory on venter, with broad brown bands on dorsum excluding posterior margin of each segment, short brown bands around spiracles on venter, and somewhat orange in median of venter. Anal tube of male and gonostyli white, aedeagus white to dark brown ( Figs 1, 4 View FIGURES 1–6 , 10, 12 View FIGURES 7–13 ).

Structure. Head large and elongate, in dorsal view, vertex widest at base, with lateral marginal carinae almost parallel, disc depressed without median carina, posterior margin slightly concave ( Fig. 2 View FIGURES 1–6 ); in lateral view, extremely extending forward, more than four times width of eye, with dorsal margin straight, ventral margin straight in basal half and curved dorsad in apical half, junction between vertex and frons sharply angular ( Figs 1, 3 View FIGURES 1–6 ); in ventral view, lateral marginal carinae distinctly developed and contiguous almost throughout, except for apical third part slightly separated ( Fig. 4 View FIGURES 1–6 ). Postclypeus significantly shorter than frons in length, nearly triangular, with a distinct longitudinal median carina ( Figs 3, 4 View FIGURES 1–6 ). Rostrum somewhat short and thick, about equal to postclypeus in length, extended slightly beyond coxae of hind legs, with apical segment short and slightly expanded ( Figs 3, 4 View FIGURES 1–6 ). Eyes large, with ventroposterior margin concave. Ocelli barely visible. Antennae very elongate, with scape slender, pedicel elongate and extending forward, about three fifths of frons in length, appendages double and U-shaped at base, each branch slightly shorter than pedicel in length ( Figs 1–4 View FIGURES 1–6 ).

Thorax. Pronotum extremely short at middle, anterior margin roundly convex and posterior margin deeply concave ( Fig. 2 View FIGURES 1–6 ). Mesonotum large and subrhomboid, elevated on disc, depressed on lateral and posterior parts, with a feeble vertical median carina and two lateral ones ( Fig. 6 View FIGURES 1–6 ). Tegmina narrow and elongate, anterior margin slightly arched, posterior margin straight in basal half and arched in apical half, with an emargination near apex, apical margin round; vein Pc+CP relatively obvious about basal quarter and forming a narrow and long costal area with CA, then fused with CA in remaining part; ScP+RA separating from RP at basal third of tegmina, before CuA forking; ScP+RA two-branched at terminal, with anterior part of trunk and branches slightly thickening due to minutely vesicular sclerotization; RP three-branched at terminal; MP with MP 4 and MP 3 both single, MP 2 two-branched and MP 1 four-branched, altogether eight branches at terminal; CuA forked near basal third, and fused again near about apical third to form closed Cell 5 (C5 = procubital cell); clavus open and extremely elongate, extremely narrow basally and expanded apically, spear-like; Cell 1-5 all elongate ( Figs 7 View FIGURES 7–13 , 20 View FIGURES 20–25 ). Wings flabellate, anterior margin nearly straight except for slightly convex near middle, posterior margin curved, apical margin narrowly round, with a stridulatory plate bearing a concave external margin on jugal margin; ScP+RA separating from RP at about middle, MP single, CuA three-branched ( Figs 8, 9 View FIGURES 7–13 , 21 View FIGURES 20–25 ). Metatibiotarsal formula: 5-4-2 ( Fig. 5 View FIGURES 1–6 ).

Male genitalia. Anal tube elongate, about equal to gonostylus in length, in dorsal view, subrectangular, widest at base and constricted distad, lateral margin slightly incurved near middle, with anal stylus triangle at apex ( Fig. 11 View FIGURES 7–13 ); in lateral view, dorsal margin straight, ventral lateral margin arched ventrocaudad in most of central part, deeply roundly concave near apex and convex ventrad at apex, epiproct short and paraproct long ( Figs 10, 13 View FIGURES 7–13 ). Pygofer narrow, in lateral view, widest at ventral margin and narrow dorsally, anterior margin slightly concave in central part, with laterodorsal angles obtusely rounded, not produced ( Figs 10, 13 View FIGURES 7–13 ); in ventral view, anterior margin straight, posterior margin slightly convex at middle, without medioventral process. Gonostylus long and broad, in dorsal view, incurved apically, outer margin relatively smooth, inner margin sinuated with an obvious angular protrusion near middle, with basal lamina round and slightly emarginate at middle ( Figs 11 View FIGURES 7–13 , 15 View FIGURES 14–19 , 22 View FIGURES 20–25 ); in lateral view, nearly scoop-like, sharply constricted and upcurved apically, dorsal margin relatively straight and stout with narrow hirsute membrane, with a large internal arched process at dorsal apex, bearing a small spine at base, ventral margin somewhat sinuated; anterior part of gonostylus nearly straight in lateral view, about quarter of gonostylus in length ( Figs 10, 12, 13 View FIGURES 7–13 , 16 View FIGURES 14–19 , 23 View FIGURES 20–25 ). Phallic complex moderately broad and long, in lateral view, periandrium slightly constricted distad, dorsal margin with two slight protuberances bearing many small thorns at apex in right view, ventral margin with a median longitudinal membrane protruded from subapical portion ( Figs 18, 19 View FIGURES 14–19 , 24 View FIGURES 20–25 ); with two long processes, and two double-layered folding membranes (opening towards right) at apex, in right lateral view: 1) a folding membrane (M 1) at top with apical margin of dorsal layer protruding cephalad and finger-like, 2) a long needle-like process (P 1) extending cephalad, 3) a long cane-like process (P 2) extending cephalad, and curved downwards at apex, 4) a large folding membrane (M 2) strongly extended cephalad beneath three sclerotized processes, dorsal margin almost reaching base of periandrium ( Figs 19 View FIGURES 14–19 , 24 View FIGURES 20–25 ); in dorsal view: 1) P 1 broad and slightly directed towards right basally, pointed and curved cephalad apically, 2) M 2 very broad with dorsal layer extending further than ventral layer, 3) P 2 broad basally and constricted to needle-like apically, 4) M 1 with dorsal layer extending further than ventral layer, and dorsal margin protruded in finger-like at middle ( Figs 17 View FIGURES 14–19 , 25 View FIGURES 20–25 ).

Type material. Holotype: ♂ ( INHS), EI Yunque National Forest , Puerto Rico, 18.29421°N, 65.79121°W, 750 m, 17–29 October 2012, coll. CH Dietrich, BO Morris, Malaise trap. GoogleMaps

Etymology. The specific epithet refers to the red horizontal submarginal line on the frontal process of the head.

Remarks. This species agrees well with the genus description, including the head shape ( Figs 1–3 View FIGURES 1–6 ) and tegminal venation ( Figs 7 View FIGURES 7–13 , 20 View FIGURES 20–25 ). It is significantly different from the previously known species of Otiocerus by its unique color pattern and by the male genitalia.