Figures 34, 39

Description. Female. Body length 3.1 mm, fore wing length 3.4 mm.

Head. Rather transverse in dorsal view, 2.1× as wide as long and nearly as wide as mesoscutum. Temple shiny and impunctate, rather constricted. Face relatively shiny, with shallow punctures, sparsely pubescent, inner margin of eyes subparallel, transverse, 0.7× as high as wide. Ocelli relatively large, distance between fore and a hind ocellus smaller than diameter of an ocellus, posterior imaginary tangent to fore ocellus virtually transecting hind two ocelli, POL:OD:OOL=5.0:2.8:4.2. Antenna distinctly shorter than body, penultimate antennomere 1.6× longer than wide.

Mesosoma. Length:breadth:height=46.5:32.0:36.0. Disc of mesonotum relatively shiny, with much silvery pubescence, finely punctate, interspaces not larger than diameter of punctures. Scutellar sulcus straight, deep, narrow but only with one carina in between. Scutellum shiny, with shallow punctures. Propodeum shiny, with setose punctures anterior-laterally, base of areola U-shaped, a few carinae inside U-shaped and on posteral-lateral field. Mesopleuron highly polished, with shallow setose punctures anteriorly.

Legs. Hind femur stout, 2.8× longer than wide. Spines on outer side of hind tibia sparse. Spurs of hind tibia of equal size, over half length of hind basitarsus. Basitarsus of hind leg weakly shorter than tarsomeres 2–4 combined (12.0:15.0).

Wings. Pterostigma3.4× as long as its widest part. Vein 1-R1 (metacarp) 1.2× longer than pterostigma, 5.1× as long as its distance from the apex of the marginal cell. Vein r arising from apex of pterostigma, nearly as long as width of pterostigma, vein r shorter than vein 2-SR, indistinctly angled at their meeting, vein 2-M 2/5 length of vein 2-SR. 1 st discal cell almost as wide as high. 1 st submarginal cell of hind wing 2× wider than high. Vein cu-a strongly curved.

Metasoma. Distinctly longer than thorax (60.0:46.5). T1 broad (weakly widen apically), wide of hind 1.4× longer than length, concave at basal third, turned-over with shallow punctures, weakly rugulose along middle and hind. T2 weakly uneven, nearly straight apically, 3.3× wider than long in the middle. T3 1.4× longer than T2. Tergites after T1 shiny, polished, pubescent. Hypopygium shorter than apex of abdomen. Ovipositor sheath 4/5 length of hind tibia, fusiform, expanded after anterior fifth, then gradually narrowing towards apex.

Colour. Body black. Tegula black. Spurs pale yellow. Palpi most dirty yellowish brown, darker basally. Antennae and ovipositor sheath evenly dark brown. Labrum and mandible dark red. Hind leg dark red to black, fore and middle legs plus anterior half of hind tibia bright yellow (except fore and mid coxae). Wing membrane hyaline, vein 1-R1, r, 2-SR, 2-M and pterostigma brown, other veins pale brown, pterostigma with pale basal spot.

Male. Similar to female, except: antenna much longer, penultimate antennomere 2.3× longer than wide; T1 slightly longer; T1 indistinctly constricted behind; and T2 much longer.

Variation. Body length 2.8–3.4mm.

Host. Unknown.

Material examined. Holotype: ♀, Mt. West Tianmu (Sanmuping), Linan, Zhejiang, 1999. V.24, Zhao Mingshui, No. 20003612. Paratypes: 1♀, Mt. West Tianmu (Sanmuping), Linan, Zhejiang, 1999. V.24, Zhao Mingshui, No. 20003615; 1♀, Mt. Longwang, Anji, Zhejiang, 1996. VI.25, Zhao Weichun, No. 963856; 1♀, Erlonghe, Jingyuan, Ningxia, 2008. VII.3, Yao Jiemin, No. 200808407; 1♀, Guimagou, Pengyang, Ningxia, 2008. VII.10, Yao Jiemin, No. 200808661; 1♀, Dushan, Guizhou, 2008. VII.10, Zhou Shengzhen, No. 860194; 1♀, Houzhenzi, Zhouzhi, Shannxi, 1998. VI.2–3, Ma Yun, No. 981715; 2♀♀, Huoditan (Banqiaogou), Shannxi, 1998. VI.5, Ma Yun, Nos. 982163, 982373; 2♀♀, Mt. Laoshan, Shangdong, 1995. VIII.2, Cai Ping, Nos. 958206, 958237; 4♀♀1♂, Licun, Qingdao, Shangdong, 1995. VIII.2, He Junhua, Nos. 955610, 955621, 955642, 955637, 955638(♂).

Distribution. China (Zhejiang, Ningxia, Guizhou, Shannxi, Shandong).

Etymology. The specific name “ unicarina ” derived from the Latin adjective “unicus” and noun “carina”, referring to scutellar sulcus only with one carina in between.

Remarks. This species is similar to D. aegeriphagous Liu & Chen, sp. n., but differs from the latter by the following: T1 transverse; ovipositor sheath fusiform; and hind femur stout.