Notes on the Nazeris fauna of Yunnan Province, China (Coleoptera, Staphylinidae, Paederinae)

Abstract Two new species of the genus Nazeris Fauvel collected from Nabanhe Nature Reserve, Yunnan Province, are described under the names of Nazeris nabanhensis sp. n. and Nazeris caoi sp. n. The male sexual characters are described and illustrated. A key to the Nazeris species of Yunnan is provided. A map of the collecting sites is given.

Th e specimens from Yunnan Province contained another two undescribed species, N. nabanhensis sp. n. and N. caoi sp. n. Th e male sexual characters of the two new species are described and illustrated. A map (fi g. 13) of the collecting sites of Nazeris species in Yunnan and a key to the Yunnan species are provided.
Th e types are deposited in the Insect Collections of Department of Biology, Shanghai Normal University, Shanghai, P. R. China (SHNUC).

Methods
Th e specimens were collected from decaying leaf litter of forest fl oors by hand sifting. Th ey were killed with ethyl acetate and dried. To examine the male genitalia, the last four abdominal segments were detached from the body after softening in hot water. Th e aedeagi and sternites were mounted in Euparal on plastic slides. Drawings were made using an Olympus SZ61 microscope. Photos were taken with an Olympus E420 camera mounted on an Olympus SZX12 stereoscope. Material of other Yunnanese Nazeris species was not examined. Th e characters used in comparative remarks and keys are according to descriptions of Watanabe and Xiao (1993, 1997, 2000, Watanabe (1996), Jarrige (1948) and Rougemont (1988).

Measurements
Body length: measured from anterior margin of labrum to end of abdomen; Forebody length: measured from anterior margin of labrum to elytral apices; Eye length: longitudinal length of eye in dorsal view; Postocular length: length of postocular portion in dorsal view; Head width: width of head across eyes; Pronotum width: width of pronotum across the widest part; Elytra width: width of elytra across the widest part; Head length: measured from front margin of head to its posterior margin; Pronotum length: measured from front margin of pronotum to its posterior margin; Elytra length: measured from humeral angle to apicolateral angle. Description. Body length: 5.8-6.4 mm; forebody length: 3.3-3.5 mm.
Abdomen elongate, tergites without any microsculpture. Seventh sternite ( dian lobe in dorsal view tri-lobed, median part cone-shaped, two outer parts acute at apices, with little agnail in each outer side near apex; dorso-lateral apophyses slightly curved inward, distinctly widened near apex, extending beyond apices of median lobe.
Female. Seventh and 8th sternites simple. Th e other characters are similar to those of male.
Remarks. Th e new species is similar to N. daliensis Watanabe (1997: 7) from Yunnan Province in appearance, but it can be distinguished from the latter by the following characters: elytra slightly narrower than pronotum (in N. daliensis nearly as wide as, or slightly broader than pronotum); depth of excision of male 8th sternite nearly half of middle length of sternite (in N. daliensis much shallower, nearly 1/3 of middle length of 8th sternite); apical part of median lobe of aedeagus in dorsal view tri-lobed (in N. daliensis not lobed). Th e new species can be distinguished from N. coomani Jarrige (1948: 40) from Vietnam by head with umbilicate punctation (in N. coomani punctation of head simple) and distinguished from N. odzisan Watanabe (1996: 1) from Vietnam by elytra shorter than wide (in N. odzisan elytra longer than wide); dorso-lateral apophyses of aedeagus extending beyond apices of median lobe (in N. odzisan not extending to apices of median lobe).
Etymology. Th e specifi c name is derived from the name of the type locality: Nabanhe Nature Reserve.  Description. Body length: 6.1-6.4 mm; forebody length: 3.3-3.6 mm.
Female. Seventh and 8th sternites simple. Th e other characters are similar to those of male.
Remarks. Th e present new species is similar in appearance to N. nabanhensis sp. n. from the same locality, but can be distinguished from the latter by the following characters: postocular part more than twice as long as longitudinal diameter of each eye (in N. nabanhensis less than twice as long as longitudinal diameter of each eye); median lobe of aedeagus in dorsal view bi-lobed (in N. nabanhensis tri-lobed); dorso-lateral apophyses of aedeagus not extending to apices of median lobe (in N. nabanhensis extending beyond apices of median lobe). Th e new species can be distinguished from N. coomani Jarrige (1948: 40) from Vietnam by head with umbilicate punctation (in N. coomani punctation of head simple), and distinguished from N. odzisan Watanabe (1996: 1) from Vietnam by elytra shorter than wide (in N. odzisan elytra longer than wide); median lobe of aedeagus in dorsal view bi-lobed (in N. odzisan not lobed).
Etymology. Th e species is named in honor of Mr. Guanghong Cao of Nabanhe Nature Reserve, who helped us a lot during fi eld work.