Orthogonius constrictus Tian, Deuve & Felix

Tian, Mingyi, Deuve, Thierry & Felix, Ron, 2012, Orthogonius species and diversity in Thailand (Coleoptera, Caraboidea, Orthogoniini), a result from the TIGER project, ZooKeys 164, pp. 51-90 : 63-64

Orthogonius constrictus Tian, Deuve & Felix sp. n. Figures 1022

Diagnosis.

Medium sized, labrum sexsetose, nearly straight at apical margin, palpiger asetose, even and odd intervals subequal in width in middle portion, prosternal process bordered at apex; apical margin of abdominal ventrite VII widely and rather deeply emarginate in male; a member of the Orthogonius longicornis species group, distinguished by its aedeagus constricted subapically in dorsal view.

Length: 12.5 mm; width: 5.5 mm. Habitus as in Figure 10.

Description.

Dark brown or black, but palpi and femora yellowish brown; trochanters, coxae and lateral pronotal margins reddish brown.

Wrinkles and punctures: surface smooth and impunctate; head and pronotum faintly striate, odd elytral intervals (3, 5 and 7) with an irregular row of fine punctures. Surface strongly shiny.

Microsculptural meshes densely isodiametric on elytra, denser and more transverse on pronotum and head.

Head stout, as long as wide; eyes very large, strongly prominent, frons and vertex moderately convex, frontal impressions small, short, fovea-like, clypeus bisetose, rather even, labrum sexsetose, nearly straight at apical margin; ligula very small and narrow, bisetose at apex; palpi slender, subcylindrical; palpiger asetose, mentum without median tooth, asetose; submentum with one pair of setae. Antennae slender, extended beyond basal 1/4 of elytra, pubescent from apical 2/3 of antennomere 4; antennomeres 3 slightly shorter than 4, antennomeres 4 and 5 subequal in length; antennomeres 1-3 glabrous; antennomeres 4 and 5 distinctly expanded laterally.

Pronotum strongly transverse, PW/PL=1.63, sides evenly rounded, widest at about middle, both basal and fore margins beaded, lateral expanded margins well defined, wide, uneven, smooth and rather flat; both fore and hind angles rounded; disc moderately convex, both transverse impressions not well defined; basal foveae small, middle line distinct.

Elytra ovate (EL/WL=1.55), strongly convex, basal border complete; sides slightly expanded in middle portion, nearly parallel-sided, widest at middle; striae deep, punctate-striate, intervals distinctly convex; intervals 2, 4 and 6 subequal in width, each wider than intervals 1, 3, and 5, respectively, but less than twice as wide; odd intervals with more distinct fine punctures; apex roundly truncate, inner angle broad, without tooth; interval 3 with three well marked setiferous pores (but middle pore absent from left elytron in the holotype and an additional fourth pore present on left elytron in one of the paratypes); interval 7 simple, wide and not carinate, without seta.

Legs moderate, fore tibia with outer angle nearly rectangular, blunt, outer margin faintly serrate; middle and hind coxae smooth and glabrous; middle and hind tibia slender, apex slightly dilated; middle tibia not dilated or curved in middle portion; hind apical tibial spurs very long and sharp; tarsomere 1 much longer than 2, tarsomere 3 slightly longer than 4, tarsomere 4 deeply emarginate at apex (about 1/3 deep as the joint); all tarsal claws strongly pectinate; hind femur moderately dilated, with 2 posterior setae on ventral.

Prosternal process well bordered at apex. Apical margin of abdominal ventrite VII widely and rather deeply emarginate in male.

Male genitalia (Figure 22): Aedeagus elongate, expanded in median portion, sinuate before apex which is more or less bent and pointed at tip; in dorsal view, distinctly constricted before apex, the apical lamella long and slender, 3.4 times as long as wide.

Female. Unknown.

Remarks.

This species is a member of the Orthogonius longicornis group, but is easily distinguished from other members by its long and slender apical lamella, together with aedeagus more or less constricted before apex in dorsal view.

Type material.

Holotype: male, "Thailand: Phetchabum, Thung Salaeng Luang NP, Gang Wang Nam Yen, 16° 36.284 N, 100° 53.128E, 749 m, Malaise trap, 29. vi– 6.vii.2007, Pongpitak Pranee & Sathit leg., T 2069", in QSBG.

Paratypes: 2 males, ibid, in QSBG and MNHN, respectively.

Etymology.

The species name refers to the more or less constricted base of the apical lamella of aedeagus in dorsal view.

Distribution.

Thailand. Known only from the type locality.