Two new Lesteva Latreille (Coleoptera, Staphylinidae, Omaliinae) from Longwangshan Mountain, East China

Abstract Two new species of Lesteva Latreille are described and illustrated from Longwangshan Mountain, East China, viz. Lesteva cala Ma & Li, sp. n. and Lesteva erythra Ma & Li, sp. n. The latest key to Chinese Lesteva is modified to include the species described from continental China since 2000.


Introduction
Lesteva Latreille is one of the largest omaliine genera of the family Staphylinidae with over 100 species worldwide, among which 18 are known from China (Cameron 1934, Rougemont 2000, Watanabe 2005. So far, eight species have been recorded from Longwangshan mountain, Zhejiang Province, East China (Rougemont 2000 (7 spp.), Li et al. 2005 (1 sp.)).
In April 2004, the staff of the junior author's laboratory surveyed the staphylinid fauna of Longwangshan Mountain, during which a large series of Lesteva were collected. On closer examination these beetles were found to belong to two new species. Since there are three hitherto known subgenera of the genus: Lesteva Latreille, 1797, Lestevidia Jeannel & Jarrige, 1949and Lestevina Bordoni, 1999, we arrange both new species into the subgenus Lesteva Latreille based on the definition of subgenera. In the present paper, the new species are described and illustrated, with modified couplets of the latest key (Rougemont 2000) to Chinese Lesteva.

Material and methods
All measurements are in millimeters. The following abbreviations are used in the text: BL -length of the body from the labral anterior margin to the anal end; FLlength of the body from the labral anterior margin to the elytral apex; HL -length of the head from the clypeal anterior margin to the head base; HW -maximum width of the head; PL -length of the pronotum along the midline; PW -maximum width of the pronotum; EL -length of the elytra from the apex of the scutellum to the elytral posterior margin; EW -maximum width of the elytra.
The holo-and paratypes are deposited in the Insect Collection of Shanghai Normal University, Shanghai, China (SNUC). Habitus as in Fig. 1. Black, mouth-parts, antennae and legs uniformly rufo-testaceous. Each elytron with a dark red subhumeral macula. Pubescence pale, evident and recumbent on whole body.

Lesteva
Head sub-triangular, coarsely and sparsely punctate, widest across eyes and slightly broader across compound eyes than long; vertex moderately depressed; eyes prominent; ocelli distinct, distance between them slightly larger than that from lateral margin of each ocellus to mesal margin of eye; postocular margins about half length of longitudinal diameter of eye; antennae moderately long, overlapping base of pronotum by two terminal segments when pulled posteriad; antennomeres I broad at middle, antennomeres II much shorter and narrower than I, antennomeres III-XI gradually thickened; relative length of each antennomere from base to apex as 10 : 6 : 7.5 : 6.5 : 5.5 : 5.5 : 6 : 5.5 : 6.5 : 6 : 12.
Pronotum subcordate, moderately convex, widest near anterior third, slightly wider than head; lateral margins arcuate at anterior two-thirds and nearly straight at posterior third; punctation and pubescence similar to those on head; disc with shallow U-shaped depressed area. Scutellum subtriangular, surface with fine punctation and pubescence.  Elytra subtrapezoidal, gradually dilated posteriorly, posterior angles broadly rounded; punctation and pubescence distinctly finer and sparser than those on pronotum.
Abdomen broad, widest at segment IV (first visible abdominal segment), then distinctly narrowed posteriorly. Tergites with dense, fine punctation and decumbent pubescence; tergites IV-V each provided with one pair of tomentose admesal patches.
Female. Protarsomeres I-IV not dilated. Otherwise similar to male. Distribution. East China: Zhejiang Province. Bionomics. The type series were obtained by sifting leaf litter and wet moss at the streamside of the Longwangshan Mountain in late April.
Etymology. The specific name 'cala' is a latinized Greek adjective and means'beautiful'.
Habitus as in Fig. 2. Black, elytra usually paler, darkish brown, suture and lateral margins reddish; mouth-parts fuscous brown; antennae and legs reddish brown, except for apex of femora and large part of tibia which are infuscate; each elytron with one small round orange-yellow spot near middle. Pubescence pale, evident and recumbent on whole body.
Head subtriangular, widest across eyes and slightly broader across compound eyes than long, densely and coarsely punctate, vertex moderately depressed; eyes prominent; ocelli distinct, distance between them equal to that from lateral margin of each ocellus to mesal margin of eye; postocular margins less than half length of longitudinal diameter of eye; antennae elongate, extending beyond posterior margin of pronotum by three segments when pulled posteriad, antennomeres I moderately robust, antennomere II much shorter and narrower than I, antennomeres III-XI gradually thickened; relative length of each antennomere from base to apex as 9 : 5.5 : 6 : 5.5 : 6 : 6 : 5 : 5.5 : 5.5 : 5 : 10.
Pronotum subcordate, slightly convex, widest near anterior third, slightly wider than head; lateral margins arcuate at anterior two-thirds and nearly straight at posterior third; more coarsely and densely punctate than on head, with slightly deep U-shaped depression on disc. Scutellum subtriangular, scattered with fine punctation and pubescence.
Elytra subtrapezoidal and rather flat, gradually dilated posteriorly, posterior angles broadly rounded, coarsely and sparsely punctate, covered with fine pubescence as on pronotum.
Abdomen broad, widest at segment IV (first visible abdominal segment), then distinctly narrowed posteriorly. Tergites with dense, fine punctation and decumbent pubescence; tergites IV-V each with one pair of tomentose admesal patches.
Female. Protarsomeres I-IV not dilated. Otherwise similar to male. Distribution. East China: Zhejiang Province. Bionomics. All the type specimens were obtained from the same habitat as the preceding species.
Etymology. The specific epithet 'erythra' means 'reddish', referring to the body color of the new species.
Remarks. The new species is placed close to L. flavopunctata Rougemont in sharing a similar form of the elytral spots, but can be readily separated by the body being somewhat spindle-shaped. Lesteva erythra also resembles L. flavopunctata in having a similar aedeagal form, but differs by the aedeagus with the parameres subequal in length as median lobe, while L. flavopunctata has the aedeagus with the parameres shorter than the median lobe.

Modified couplets of Rougemont's key
Note. Rougemont's key (Rougemont 2000) for the identification of Chinese Lesteva species is modified as follows to include the taxa described from continental China since 2000.