Drabescus viraktamathi, Xu & Zhang, 2018

Xu, Deliang & Zhang, Yalin, 2018, Review of Indonesian species of the leafhopper genus Drabescus Stål (Hemiptera: Cicadellidae: Deltocephalinae) with description of two new species, Zootaxa 4524 (4), pp. 473-481 : 477-480

Drabescus viraktamathi sp. nov.

( Figs. 3 , 4 )

Description. Body length (including tegmina), male: 6.4–6.6mm; female: 6.4–6.6mm.

Body robust, brownish. Face ( Fig 3. B ) brown. Pronotum ( Fig 3. A, C ) brown with dense wrinkle and numerous yellowish macules. Mesonotum ( Fig 3. A, C ) dark brown; lateral margin of scutellum ( Fig 3. A, C ) yellow. Tegmen ( Fig 3. E ) brown; veins marked with callous tubercles; appendix dark in coloration. Male and female tegmina ( Fig 3. A, E, F ) with pale transverse band in the middle section. Apex of female pygofer ( Fig 3. G ) dark brown.

Head nearly as wide as pronotum; anterior margin ( Fig 3. D ) with transverse ridge. Crown ( Fig 3. A, C, F ) rounded and slightly produced; coronal suture ( Fig 3. D ) distinct; anterior and posterior margin nearly parallel; medial length somewhat longer than next to eyes; transversely concave subapically, with dense longitudinal wrinkles. Ocelli ( Fig 3. D ) situated on anterior margin of head when viewed from above; approximately three times own diameter from corresponding eyes; lateral frontal sutures ( Fig 3. B, D ) extending to corresponding ocelli. Face ( Fig 3. B ) triangular; frontoclypeus broad proximally and slightly narrow apically; epistomal suture distinct; anteclypeus with median longitudinal carina; constricted near base and slightly expanded apically; gena ( Fig 3. B ) with fine wrinkles. Pronotum ( Fig 3. C ) with lateral margin very short; discal and posterior region slightly swollen. Front tibia slightly broadening dorsally. Hind femur setal formula 2+1.

Male pygofer side ( Fig 3–4. H, I ) long, tapering apically without dorsoposterior process, with several macrosetae. Valve ( Fig 4. J, K ) semicircular. Subgenital plate ( Fig 4. J, K ) finger-like and curved dorsad; wide basally and tapering distally; lateral margin with scattered microsetae. Style ( Fig 4. J, K, L ) with apical process elongate and blunt; lateral lobe slightly protruding, with microsetae. Connective ( Fig 4. M ) Y-shaped; stem approximately as long as anterior arms. Aedeagal shaft ( Fig 4. N, O, P ) curved dorsad with pair of slim laterobasal processes, extending beyond apex of shaft; inner margin of processes serrate; gonopore ( Fig 4. N, O ) apical.

Female genitalia. 3 rd Valvulae ( Fig 3. G ) conspicuously surpassing apex of pygofer.

Material examined. Holotype: ♂, Indonesia, Seram , Gunung Binaia north slopes, 2000m, Upper montane forest, Aug.-Sept. 1987, coll. J. D. Holloway, D. T. Jones et al., Operation Raleigh . Paratypes: 3♂ 2♀, same data as holotype ; 1♂ 5♀, same data as holotype except 1500m, lower montane forest ; 1♀, same data as holotype except 1200m, lower montane forest. All BMNH .

Etymology. The new species is named in honor of Dr. C. A. Viraktamath, who has made great contributions to taxonomic study of the Oriental Cicadellidae .

Remarks: This new species is similar to D. stilliformis sp. nov. but differs in coloration and in the male genitalia by the longer aedeagal processes and less pronounced lateral lobe of the style.

Figures

FIGURE 3. A–E D. viraktamathi sp. nov., male; A, Dorsal habitus; B, Face, ventral view; C, Head, pronotum and scutellum, dorsal view; D, Head, dorsoanterior view; E, Lateral view; F, D. viraktamathi sp. nov., female, dorsal view; G, Apex of female abdomen, ventral view; H, Pygophore and tenth segment of male, left lateral view.

FIGURE 4. I–P Male genitalia of D. viraktamathi sp. nov.; I, Pygofer, ventral view; J, Valve, subgenital plate, style, connective and aedeagus, dorsal view; K, Valve, subgenital plate and style, dorsal view; L, Left style, ventral view; M, Connective, ventral view; N–O, Aedeagus, dorsal and posterior view, respectively; P, Aedeagus and connective, left lateral view.