Wroughtonia bifurcata Yan et van Achterberg

Yan, Cheng-Jin, Achterberg, Cornelis Van, He, Jun-Hua & Chen, Xue-Xin, 2017, Review of the tribe Helconini Foerster s. s. from China, with the description of 18 new species, Zootaxa 4291 (3), pp. 401-457 : 423-425

Wroughtonia bifurcata Yan et van Achterberg , sp. nov.

( Fig. 10 )

Description. Male. Length of body 7.2 mm, of fore wing 5.9 mm.

Head. Antennal segments about 40 (too moldy for an exact count), length of third segment 1.1 times fourth segment; length of third, fourth and penultimate segments 3.2, 2.9 and about 2 times their width, respectively; maxillary palp incomplete; head 0.8 times as long as wide in frontal view; length of eye 1.6 times temple in dorsal view; length of malar space 1.3 times basal width of mandible and 0.4 times maximum width of eye; malar suture distinct; POL:OD:OOL = 14:10:17; vertex sparsely punctulate and shiny; temple punctulate, but coarsely rugose near mandible; occipital carina complete, wide and straight ventrally, joining weakly developed hypostomal carina near base of mandible and occipital flange small; frons latero-dorsally smooth, deeply impressed medio-anteriorly and shallow posteriorly, anteriorly with crest-shaped elevated border of depression and remains removed from level of anterior ocellus ( Fig 10 H); border of depression with tooth-like protuberance anteriorly, depression nearly smooth, anterior lamella of frontal depression bifurcate and smooth in lateral view, posteriorly directing branch spatulate and anterior part wide triangular ( Figs 10 I, J); face coarsely reticulate-rugose; clypeus coarsely rugose and protruding dorsally, but flat and smooth ventrally.

Mesosoma. Length of mesosoma twice its height; side of pronotum mainly coarsely crenulate or rugose, but dorsally densely punctate; notauli wide, rather deep and coarsely crenulate, posteriorly ending in a wide coarsely reticulate area; mesoscutum largely smooth, but middle lobe with some punctures and distinctly protruding; scutellar sulcus with one carina and some rugae; scutellum flat or nearly so, densely punctate and posteriorly crenulate; in front of tegulum coarsely crenulate and with weak carina; precoxal sulcus complete, rather shallow, coarsely punctate medially and remainder with some rugae; metanotum with a complete median carina; propodeum coarsely punctate-reticulate and with distinct parallel-sided areola medially ( Fig. 10 F).

Wings. Fore wing: about 3 times as long as wide. 1-M curved; pterostigma 4.5 times as long as wide; 1-R1 1.3 times longer than pterostigma; r:3-SR:SR1 = 13:10:76; 2-SR:3-SR:r-m = 20:10:13; 1-M:m-cu = 20:10; 2-SR+M long ( Fig. 10 A); SR1 almost straight; cu-a inclivous, postfurcal; 1-CU1 rather short; r-m inclivous. Hind wing: 1- M:1r-m = 10:9; cu-a inclivous and nearly straight.

Legs. Length of fore tarsus 1.5 times fore tibia; length of femur, tibia and basitarsus of hind leg 3.4 (excluding ridges), 8.6 and 5.8 times their width, respectively; hind femur coarsely punctate laterally, with 5 protruding costate transverse ridges ventrally and several smaller ridges and no single protuberance ( Fig. 10 E), moderately inflated and ventrally with transverse ridges; length of outer and inner hind tibial spur both 0.24 times basitarsus.

Metasoma. First tergite coarsely reticulate and its dorsal carinae coarsely developed in basal half of tergite; length of first tergite 1.2 times its apical width; second tergite coarsely reticulate-punctate, but posteriorly mainly smooth ( Fig. 10 D); second suture rather deep, smooth and narrow.

Colour. Black; palpi (including basal segments), 2nd–10th antennal segments, fore leg, middle leg (but tarsus pale yellowish), hind coxa, trochanter, trochantellus, basal 0.4 of femur, humeral plate and first tergite laterally yellow; remainder of hind femur mainly dark brown; hind tibia basally and hind tarsus pale yellowish or ivory; remainder of antenna, apical two-thirds of hind tibia, tegulum and pterostigma dark brown; wing membrane slightly infuscate and most veins brown.

Female. Unknown.

Material examined. Holotype, ♂, China, Guangxi prov., Longzhou, Nonggang, 18.V.1982, Junhua He , No. 821469 ( ZJUH).

Comparative diagnosis. Similar to W. alba (Chou & Hsu) because of densely foveate hind femur and the colour pattern of the hind leg. According to the original description of W. alba the basal antennal segments are black (except scapus brownish yellow in W. bifurcata ), hind coxa reticulate dorsally (only punctate), hind femur with wide ventral protuberance subapically (only a series of strong transverse costate ridges) and length of hind femur 2.9 times its width (3.6 times).

Host. Unknown.

Etymology. Named after the bifurcate frontal protuberance in the frontal depression near the antennal sockets.

Distribution. China (Guangxi).

Figures

FIGURE 10. Wroughtonia bifurcata sp. nov., ♂, holotype. A, fore wing; B, hind wing; C, mesosoma, lateral aspect; D, first-fourth metasomal tergites, dorsal aspect; E, hind leg, lateral aspect; F, propodeum, dorsal aspect; G, habitus, lateral aspect; H, head, lateral aspect; I, head, dorsal aspect; J, frontal bifurcate protuberance, dorso-lateral aspect.