Taxonomic study of the genus Tetralonioidella Strand from China (Hymenoptera: Apidae: Melectini) Author Niu, Zeqing Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P. R. China; E-mails: niuzq @ ioz. ac. cn; yuanfeng @ ioz. ac. cn Author Yuan, Feng Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P. R. China; E-mails: niuzq @ ioz. ac. cn; yuanfeng @ ioz. ac. cn Author Zhu, Chaodong Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P. R. China; E-mails: niuzq @ ioz. ac. cn; yuanfeng @ ioz. ac. cn & University of Chinese Academy of Sciences, Beijing 100049, P. R. China Corresponding author, E-mail: zhucd @ ioz. ac. cn text Zoological Systematics 2017 42 4 418 445 journal article 10.11865/zs.201718 2095-6827 5366783 25D9FD67-3B6B-4F95-88D1-190FDD5C2E54 Tetralonioidella dinghuensis Niu& Zhu , sp. nov. ( Figs 5–6 ) Diagnosis. The species is similar to male of T . pendleburyi by its apical margin of labrum almost straight, but different by its unique shape of S7 and S8. Description. Male. BL 10.0 mm ( Fig. 5a ); head broader than long, HW: HL= 68: 51 ( Fig. 5b ); gena distinctly narrower than eye, GW: EW = 12: 18; width of metasoma broader than the width between the tegulae, MtW: MsW = 78: 70. Clypeus slightly broader than long ( Fig. 5b ); apical margin of labrum straight ( Fig. 5c ); antenna short, reaching front margin of tegula, scape conically broadened, as long as F1 to F3 together, flagellomere equal in breadth, F1 longer than broad, nearly 1.2 times as long as broad, F2 long than broad, nearly 1.6 times as long as broad, F3 equal in length with F4, about 1.2 times as long as broad, F5–F10 equal in length, nearly as long as broad, F11 rounded apically, equal in length with F3, about 1.4 times as long as broad ( Fig. 5d ); fore wing with distinct numerous papillae apically ( Fig. 6a ); scutellar spines short and broad, pointed apically, barely visible between pubescence; inner ramus of hind tarsal claw axe-shaped, arolium present ( Fig. 6b ); ventral surface of apical part of S7 with dense setae laterally, median part slightly convex, with sparse setae ( Fig. 6c ); apical margin of median process of S8 slightly concave ( Fig. 6d ); genitalia as illustrated in Fig. 6e (in dorsal view) and Fig. 6f (in lateral view), basal part of gonostylus with blunt triangular process dorsally, and the process with dense long hairs along dorsal margin ( Fig. 6f ). Clypeus black ( Fig. 5b ); mandible blackish-brown except reddish apically; labrum blackish-brown with two small bright brown spots laterally ( Fig. 5c ); antenna dark blackish-brown beneath ( Fig. 5d ); tegula yellowish-brown ( Fig. 5e ); all legs blackish-brown except mediotarsus and distitarsus dark yellowish-brown; hind tarsal claw blackish-brown apically ( Fig. 6b ). Scutum pubescence yellowish-brown ( Figs 5a, e ); clypeus, periphery of antennal socket, supraclypeal area, paraocular area and front surface of scape covered with sparse yellowish-brown hairs ( Fig. 5b ); vertex, genal area, scutum, scutellum, metanotum and episternum covered with dense and long yellowish-brown hairs ( Figs 5a, d–e ); all metasomal terga uniformly covered with thin and short yellowish hairs ( Fig. 5f ). Female. Unknown. Material examined. Holotype . ♂ , China , Guangdong , Mt. Dinghu ( 23º10′N , 120º34′E ), 23.V.1979 , coll. Yaoquan Li , Yingshu Xie & Shiyang Xia. Distribution. China ( Guangdong ). Etymology. The type location Mt. Dinghu ( Guangdong , China ) is given as the specific name.