Xenysmoderodes concavus, Yang, Ni, Zhang, Runzhi & Ren, Li, 2013

Yang, Ni, Zhang, Runzhi & Ren, Li, 2013, Two new species of Xenysmoderodes from China (Coleoptera: Curculionidae: Ceutorhynchinae), Zootaxa 3620 (4), pp. 533-543 : 534-537

Xenysmoderodes concavus sp. nov.

( Figs. 1–10 , 27 )

Diagnosis. This species can be distinguished from its congeners by the following characters: dark reddish brown in general appearance; basal 1/3 of club glabrous; rostrum dorsally marked with a central longitudinal carina from base to antennal insertion; frons moderately concave; pronotum widest at base, strongly convergent towards apex; with two incomplete, longitudinal carinae on each side of pronotal carina, separated from each other by the same distance at apical margin ( Fig. 4 ); odd intervals more convex than others, intervals with longitudinally connected tubercles with irregularly concave and obtuse apices; femora with one tooth on each leg; ventrite moderately deep, oval and concave in the middle; aedeagal body densely covered with setae at apex; apodeme slender, half as long as tegminal ring; endophallus with a X-shaped sclerite in the middle.

Description. Male. Measurements (in mm): BL=1.96, RL=0.75, RW=0.19, PL=0.52, PW=0.86, EL=1.40, EW=1.40; SL=0.40, FL =0.09, =0.10, =0.07, = = =0.04, CL=0.20. Habitus as shown in Figs. 1, 2 .

Integument. Dark reddish brown in general appearance. Eyes dark grey. Basal 2/3 of rostrum ( Fig. 27 ) and ventrites black, apical 1/3 of pronotum and distal margin of elytra red. Antennae, pro- and mesofemora reddish brown, metafemora reddish brown except black at apical 2/3. Tibiae and tarsi dark-brown.

Vestiture. Rostrum ( Fig. 27 ) sparsely covered with white, linear scales at basal 2/3. Antennal scape shiny, funicle articles to sparsely covered with white setae, club glabrous at basal 1/3, densely covered with white hairs at apical 2/3. Frons, vertex, and gena moderately covered, while ventrites to and sides of ventrite coarsely covered with white, lanceolate scales. Pronotum ( Figs. 3, 4 ) moderately covered with transparent white, lanceolate scales near pronotal carina. Prothorax densely covered with transparent yellow, lanceolate scales at upper margin laterally. Elytra ( Fig. 2 ) moderately covered with transparent yellow, hair-like scales before humeri; interval with a patch at basal 1/3, densely covered with black, irregular-shaped scales; to sparsely covered with yellow, rod-like scales at basal half; with a longitudinal row of white, oval scales; with a small patch of white, oval scales at middle. Inner surface of coxae densely covered, outer surface of meso- and metacoxae sparsely covered, and apical margin of sternal channel moderately covered with white, irregular-shaped scales; procoxae moderately covered with yellowish-white, linear scales on outer surface; pro- and mesofemora and outer surface of metafemora moderately covered with white, linear scales, inner surface of metafemora, tooth of femora, and basal surface of mesepimera densely covered with white, oval scales; tibiae sparsely covered with golden setae; tarsi sparsely covered with white setae on dorsal surface, densely covered with white cilia. Prosterna densely covered with yellowish-white, lanceolate scales, moderately covered on meso- and metasterna. Ventrite densely covered with thin, white setae at middle 1/3, both sides of ventrite and distal margin of pygidium moderately covered with white, linear scales.

Rostrum ( Fig. 27 ) 1.44× as long as pronotum, without sculpture except apical 1/3 sparsely punctured. Base of rostrum slightly narrower than frons; rostrum in dorsal view almost parallel-sided at basal 2/3, then curved and broadening towards apex, widest at apex; dorsal carina rather evident from base to apex. Antennal insertion visible in dorsal view, scrobe deep and straight, expanding ventrally on rostrum near basal part and disjunct; scape glabrous and clavate at apex, which without apical projection; funicular article oval and nearly as long as, clavate; clavate and slightly shorter than, much shorter than, to oval and nearly the same length; club 2× as long as wide, spindle-like. Eyes relatively large and prominent dorsally, not approximate anteriorly. Frons moderately concave, lacking punctures, with reticulate carina. Vertex moderately convex, with rather evident median carina from base to frons.

Pronotum ( Figs. 3, 4 ) 1.65× as wide as long, its base 1.48× as wide as apex, widest at base, then constricted towards apex, anterior margin not raised, arcuate at middle; sides less convex; pronotal carina complete, pronotal spine slender, acutely projected into basal 1/3 of elytra; both sides of pronotal carina with two incompletely longitudinal carina, equidistant from each other at apical margin; two carina near pronotal carina straight, extending from apex to connect with reticulate carina on disc, another two carinae curved to baso-lateral sides. Lateral surface moderately punctured at subapical and subdistal margins, mid-dorsal surface rather strongly convex.

Elytra ( Fig. 2 ) as long as wide, 2.69× as long and 1.63× as wide as pronotum; widest at humeri, constricted towards apex, lateral margin slightly bisinuate, distal margin W-like and slightly raised; dorsal surface slightly concave at apical 1/3; intervals 1 to 9 visible in dorsal view. Intervals spaced equally, with longitudinally, irregularly connected tubercles, with irregularly concave and obtuse apices; odd intervals more convex than even ones, intervals 2 and 5, 3 and 9 conjoined at apex. Striae punctured regularly, each puncture circular and separated by a distance nearly 2× its diameter.

Legs. Procoxae separated by distance slightly narrower than their diameter. Apical 1/3 of femora swollen, with one tooth on each leg. Tibiae rod-like, pro- and metatibiae simple at apex, mesotibiae mucronate at inner apex; length of profemora to protibiae =1.1:1; length of mesofemora to mesotibiae=1.4:1; length of metafemora to metatibiae=1.2:1. Tarsi with tasomere clavate, oval, bifid, V twice as long as; claws separated and obviously appendiculate.

Ventral area. Prosternum U-shaped at middle of apical margin. Sternal channel evident on prosternum, with distal margin between procoxae. Mesepisterna long and triangular, metepimera subrhomboidal. Metepisterna subparallel except apical 1/6 slightly broader. Ventrites moderately punctured. Ventrite I ( Fig.5 ) pentagonal and concave at middle, acute at middle of apical margin; suture between ventrites and incomplete, visible at both ends; ventrites and united, 6× as long as, and nearly equal in length, 2.5× as long as and deeply concave in the middle. Pygidium ( Fig. 6 ) pentagonal and slightly concave.

Male genitalia. Sternite IX ( Fig. 9 ) long, dark-brown, 1.4× as long as aedeagal body. Tegmen ( Fig. 10 ) ringed, faint yellow, without parameroid lobes; apodeme slender, half as long as diameter of tegminal ring; aedeagal body ( Figs. 7, 8 ) relatively wide and dark-brown, densely covered with spicules at apex, nearly flat and with irregularlyshaped sclerites on both sides; apodemes as long as body. Endophallus ( Fig. 7 ) shorter than aedeagal body, with one “X-like” sclerite in middle.

Type material. Holotype male, China, Guangxi, Napodefu, 23°25'N, 105°50'E, 4.IV.1998, 1440m, Li Wenzhu [IOZ(E)896914].

Distribution. Southern China (Guangxi province).

Etymology. The species is named “ concavus ” after the deep concavity in the middle of ventrite V in the male.

Figures

FIGURES 1 – 4. Xenysmoderodes concavus sp. nov. male holotype. 1, lateral habitus; 2, dorsal habitus; 3, lateral view of prothorax; 4, dorsal view of prothorax. Scales are 0.5 mm.

FIGURES 5 – 10. Xenysmoderodes concavus sp. nov. male holotype; 5, ventrites to; 6, pygidium; 7, dorsal view of aedeagus; 8, lateral view of aedeagus; 9, sternite IX; 10, tegmen. Scales are 0.5 mm.

FIGURES 27 – 28. Xenysmoderodes concavus sp. nov., 27, male holotype, dorsal view of rostrum, frons without carina; Xenysmoderodes flos sp. nov., 28, male holotype, dorsal view of rostrum, frons with carina. Scales are 0.5 mm.