Two new species of Dacne Latreille (Coleoptera, Erotylidae) from China, with a key to Chinese species and subspecies of Dacne

Abstract Two new species Dacne (Xenodacne) tangliangi sp. n. andDacne (Xenodacne) hujiayaoi sp. n. are described from China. A key to Chinese species and subspecies of genus Dacne Latreille is provided.


Introduction
The genus Dacne Latreille is considered to be one of the most primitive members of the subfamily Erotylinae (Wegrzynowicz 2002;Leschen 2003). Skelley (1997) reviewed this genus and later updated a world checklist and key (Skelley 2003). In general, little is known about Dacne in the Orient. Some work has been done in neighboring countries (Arrow 1925;Chûjô 1969;Chûjô and Chûjô 1988;Narukawa 1992;Chûjô and Lee 1993;Nikitsky and Kompantzev 1995), but nothing focuses specifically on China.

Material and methods
The specimens examined in this paper were collected in a wide variety of woodland fungi, in crevices under bark or in other retreats by splitting and sifting. For an examination of the male genitalia, the abdominal segments were detached from the body after softening in hot water. The aedeagi, together with other dissected parts, were mounted in Euparal (Chroma Gesellschaft Schmidt, Koengen, Germany) on plastic slides. Photos of sexual characters were taken with a Canon G9 camera attached to an Olympus SZX 16 stereoscope; habitus photos were taken with a Canon macro photo lens MP-E 65 mm attached to a Canon EOS7D camera.
The specimens treated in this study are deposited in the following public collections: Description. Body (Fig. 1, 2) stout, elongate, length: 2.8-3.1 mm; width: 1.29-1.40 mm. Head and elytra black; pronotum general black with reddish-brown sides; legs, palpi and base of antennae reddish-brown; antennal club dark brown. Each elytron with two orange bands.
Prosternum with anterior edge straight, lacking marginal bead; posterior process broad, width more than diameter of procoxa; prosternal lines apparently lacking; punctures coarse and close, diameter = eye facet, separated by 1-2 puncture diameters. Abdomen with distinct coxal lines on first ventrite nearly attaining posterior margin. Legs with tibia not dilated at apex.
Distribution. China (Yunnan Province). Diagnosis. Dacne tangliangi is most similar to Dacne (Xenodacne) maculata Chûjô due to similar form and color pattern of the body. Dacne tangliangi can be distinguished from D. maculata by the black pronotum, scutellum not transverse (length/width<1.5), posterior band in elytron not extending to the border and occurs in southwest China. Dacne maculata has a reddish pronotum, scutellum transverse (length/width>1.5), posterior band in elytron extending to the border and occurs in Japan and Siberia (Chûjô and Chûjô 1988).
Etymology. This species is named in honor of Mr. Liang Tang, collector of the new species and teacher of the senior author.  Description. Body (Fig. 10, 11) stout, elongate, length: 3.6 mm; width: 1.5 mm. Body black; legs, palpi and base of antennae reddish-brown; antennal club dark brown. Each elytron with one orange band.
Prosternum with anterior edge straight, lacking marginal bead; posterior process broad, width more than diameter of procoxa; prosternal lines apparently lacking; punctures coarse and close, diameter = eye facet, separated by 0.5-1.0 puncture diameters.  Abdomen with distinct coxal lines on first ventrite nearly attaining posterior margin. Legs with tibia not dilated at apex.
Distribution. China (Yunnan Province). Diagnosis. Dacne hujiayaoi is most similar to Dacne (Xenodacne) zonaria Lewis and it's subspecies due to similar form and color pattern of the body. Dacne hujiayaoi can be distinguished from D. zonaria by body indistinctly shining, eyes large (head width between eyes = 3.5 times eye diameter in dorsal view), the reddish-brown legs and occurs in southwest China. Dacne zonaria has the body distinctly shining, eyes small (head width between eyes > 4 times eye diameter in dorsal view), the black legs and occurs in Japan, Korea, Siberia and Taiwan (Chûjô and Chûjô 1988).
Etymology. This species is named in honor of Mr. Jia-Yao Hu, collector of the new species and teacher of the senior author.