Seladonia (Pachyceble) henanensis sp. n. (Hymenoptera, Halictidae) from China

Abstract Seladonia (Pachyceble) henanensis sp. n., is described from Henan Province, the eastern-central part of China. This species is separated from its allied species by a combination of the following morphological characters: head broad in female, inner hind tibial spur of female with 7–8 slender teeth, T1 basolaterally with appressed hair tuft in both sexes, and genitalia with long and large lower gonostylus in male. Important taxonomic characters are illustrated with photographs, scanning electron micrographs, and line drawings.

Second and third authors, Tadauchi and Xu, visited Henan Province in the eastern-central part of China in 2011 for a collaborative project, and then they collected various wild bees in the area. First author, Murao had an opportunity to examine the specimens, one of which is a new Seladonia species belonging to the subgenus Pachyceble. In the present paper, we describe this new species and illustrate diagnostically important characters with drawings, photographs, and scanning electron micrographs.

Material and methods
This study is based on the specimens deposited in the Entomological Laboratory, Faculty of Agriculture, Kyushu University, Fukuoka, Japan (ELKU), the late Dr. Shoichi F. Sakagami's collection, deposited in the Museum of Nature and Human Activities, Sanda, Hyogo, Japan (MNHAH), and the first author's private collection (without abbreviation). Terminology used in the description follows Sakagami and Ebmer (1987), and partly Pesenko (2006). Abbreviations used in the text are as follows: BL = body length; WL = wing length; HL = head length; HW = head width; IOD = interocellar distance; OOD = ocellocular distance; OCD = ocelloccipital distance; UOD = upper interorbital distance; MOD = maximum interorbital distance; LOD = lower interorbital distance; CAL = clypealveolar distance; CPL = clypeal length; EL = eye length; EW = eye width; GW = genal width; Fn = nth antennal flagellomere; FnL = nth flagellomere length; FnW = nth flagellomere width; MsW = mesosomal width; SCL = mesoscutellar length; MNL = metanotal length; PDL = propodeal dorsum length; MtW = metasomal width; IS = interspace between punctures (IS 0.5 = means 1/2 of the diameter of punctures); PP= punctures. Body measurements are given in ranges followed by the average and standard deviation. dorsal surfaces; metasomal terga usually with apical and basal bands of pale plumose hairs. But it is separated from them by male antenna long reaching metasoma, male F2 1.7-2.0 times as long as wide, and male S6 with deep depression behind gradulus.
Distribution. China (Henan Province). Diagnosis. This species seems most closely related to the Trans-Palaearctic species Seladonia (Pachyceble) tumulorum and the Holarctic species S. (P.) confusa in having similar body sculptures and male genitalia. However, it differs these allied species by the following key: Male genitalia with short and small lower gonostylus (Fig. 22)

. S. (P.) henanensis
Based on the published works of Dawut and Tadauchi (2003), Ebmer (2005), Pesenko (2006), Pesenko and Wu (1997), and the specimens examined for this study, this species is also separated from the other Chinese species by the combination of  ellomere dark yellowish brown on lower side, blackish brown on upper side. Tegula yellowish translucent. All coxae and trochanters black; fore and middle femora mostly yellow; hind femur mostly black except for apical 1/4; all tibiae and tarsi yellow. Wings transparent, veins and stigma pale yellowish. Metasomal terga narrowly yellowish brown translucent apically.
Pilosity. Body hairs whitish to pale yellowish. Head and mesosoma covered with elect fine branched hairs. Lateral surface of pronotum covered with thin tomentum. T1 basolaterally with dense, whitish appressed hairs, remaining areas with fine erect branched hairs. Disc of T2-T5 with sparse simple hairs. Apical bands on metasomal terga interrupted on all segments. Metasomal sterna without special hair tufts. Disc of S1-S4 with simple and short hairs which gradually dense toward the apical parts.
Discs of T1-T3 with dense PP over entire surface, IS smooth (IS = 0.5-1.0). S1-S4 distinctly tessellate over entire surface. S1-S4 apically nearly straight, S5 increasingly incurved. S6 (Fig. 13) with a distinct longitudinal median depression. S7-S8 (Fig. 14): S7 medially triangular, apex not exceeding S8; S8 medially slightly projecting, apex rounded with a few hairs as long as S8 itself. Genitalia (Figs 15-18, 21): gonobase short, ventral arm connected with each other in upper ends; gonocoxite nearly parallel-sided on inner and outer margins in dorsal view, with longitudinal striation in dorsal view, with fingerprint striation in lateral view; upper gonostylus with dense tuft of short hairs and another tuft of several long filament-like modified hairs ventrally, medial lobe slender with a few short hairs apically; lower gonostylus 2.3 times as long as wide, nearly as high as upper gonostylus, spatulate in lateral view, and with dense short hairs on inner surface; penis valve broad medially, with relatively long hairs along median line in dorsal view.
Female. As in male except as indicated.
Measurements ( (Fig. 11): basal area of labrum 1.7 times as wide as long; basal elevation developed, triangle-shaped; distal process slender, slightly shorter than basal area (0.9 times), and without lateral projection; keel of distal process obtuse apically; labral fimbria acutely pointed at apex. Antenna short, its apically not reaching mesoscutellum as well as the other congeners.
Variation. Male hypostoma striate in holotype, but nearly smooth in one paratype. In addition, male propodeal dorsum without smooth area (Fig. 7) in holotype, but with narrow and smooth area along posterior margin (Fig. 8) in two paratypes.