Pseudethas (Stenillus) cordiformis, Ba & Ren, 2013

Ba, Yi-Bin & Ren, Guo-Dong, 2013, Two new species and one new combination of Stenosini (Coleoptera: Tenebrionidae) from Xizang, China, Acta Entomologica Musei Nationalis Pragae 53 (2), pp. 697-702 : 699-701

Pseudethas (Stenillus) cordiformis sp. nov.

( Figs 7–12 )

Type locality. China, Xizang province, Yadong county, Duina town (N28°02′59″, E89°10′10″, alt. 4506 m).

Type material. HOLOTYPE: J, ‘ CHINA: XIZANG: Yadong County, Duina Town (N28°02′59″, E89°10′10″, alt. 4506 m), 1.viii.2011, Ren Guodong leg.’ ( MHBU) . PARATYPES: 2 JJ 2 ♀♀, same label data as holotype ( MHBU).

Description. Body dark-brown.

Head oval, length/width ratio 39: 40, widest at anterior margin of eyes. Eyes completely divided by genae, dorsal side with about 25 facets in three rows, ventral side with about 16 facets.Anterior margin of clypeus straight, lateral margin straightly narrowing forwards together with genae. Genae slightly arcuate before eyes. Tempora slightly arcuate and converging backwards. Dorsum densely covered with long yellow setae and with dense oval punctures, punctures on clypeus rounded and smaller. Antennae length reaching to basal 1/6 of pronotum; antennomere 3 1.7 times as long as wide; antennomere 10 widest; relative length ratio of antennomeres 2–11 as follows: 7.7: 12.0: 8.1: 8.0: 8.0: 8.0: 7.0: 7.6: 8.7: 9.0.

Pronotum approximately cordiform, obviously wider than head; length/width ratio 49: 51; widest at apical 1/4. Anterior margin straight; lateral margins arched; posterior margin straight in middle, slightly arched on sides. Anterior angles rectangular, posterior angles obtuse. Dorsum convex, median longitudinal depression long and shallow; densely covered with long yellow setae and densely covered with oval punctures, punctures somewhat confluent. Propleura densely covered with strong oval punctures, each with a short yellow seta.

Elytra oblong, 1.8 times as long as wide, 1.4 times as wide as pronotum, widest in middle. Elytral base concave. Humeral angles rounded. Elytron with 10 rows of strongly rounded punctures, without seta. All intervals slightly convex, with rows of short yellow setae. Epipleura with one row of rounded punctures.

Abdomen covered with strong oval punctures, gradually diminishing towards end of anal segment, each puncture with one short yellow seta. Legs slender, male meso- and metatibiae with distinct tooth on inner side. Ratio of lengths of metatarsomeres 1–4 as follows: 14.0: 7.9: 6.4: 18.0. Aedeagus long 0.8 mm; apex of paramere somewhat sharper, with 3 to 5 fine apical setae.

Measurements. Body length 4.5–6.5 mm; width 1.0–2.0 mm.

Differential diagnosis. The new species is similar to Pseudethas (Stenillus) weigeli Fouqué, 2008 , but differs from the later as follows: pronotum approximately cordiform; median longitudinal depression of pronotum longer; the shape of aedeagus is different from P. (S.) weigeli (see FOUQUÉ 2008).

Etymology. The species name is a Latin adjective cordiformis , - is, - e, referring to the characteristic shape of pronotum in this species.

Distribution. China: Xizang.

Figures

Figs 7–12. Pseudethas (Stenillus) cordiformis sp. nov. 7 – habitus; 8 – dorsal view of head and pronotum; 9 – lateral view of head; 10 – antenna; 11–12 – aedeagus: 11 – dorsal view, 12 – ventral view. Scale bars = 1.0 mm