Drabescus stilliformis, 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 : 474-477

publication ID	https://doi.org/ 10.11646/zootaxa.4524.4.4
publication LSID	lsid:zoobank.org:pub:7C35988A-2CF2-45BA-8832-9A8F7E9D1C28
DOI	https://doi.org/10.5281/zenodo.5960620
persistent identifier	https://treatment.plazi.org/id/D96B878F-A41F-3A37-64E1-8CC1C643FAA7
treatment provided by	Plazi
scientific name	Drabescus stilliformis
status	sp. nov.

Treatment

Drabescus stilliformis View in CoL sp. nov.

( Figs 1 View FIGURE 1 , 2 View FIGURE 2 )

Description. Body length (including tegmina), male: 6.3–6.4mm; female: 7.9–8.1mm.

Body yellowish brown to brown, transverse band on anterior margin of crown and on margins of pronotum, mesonotum and scutellum, ivory ( Fig 1. A, C, H View FIGURE 1 ). Face dark brown with broad ivory transverse band in middle below eyes ( Fig 1. B View FIGURE 1 ). Forewing ( Fig 1. E, F View FIGURE 1 ) with veins dark brown with whitish callosities; subcostal vein and apex of radial vein with dark stripe. Female with indistinct pale transverse medial band across forewings ( Fig 1. H View FIGURE 1 ).

Head slightly wider than pronotum. Crown ( Fig 1. A, C, H View FIGURE 1 ) transversely broad; coronal suture ( Fig 1. D View FIGURE 1 ) distinct; median length approximately a quarter as long as next to eyes; transversely concave subapically, with dense longitudinal wrinkles; concave next to eyes with oblique wrinkles. Ocelli ( Fig 1. D View FIGURE 1 ) situated on anterior margin of head, visible dorsally; distance to adjacent eyes approximately 2.5 times ocellar diameter; laterofrontal sutures ( Fig 1. B, D View FIGURE 1 ) reaching corresponding ocelli. Face ( Fig 1. B View FIGURE 1 ) wider than long; frontoclypeus slightly swollen laterally; broad basally and narrow apically; frontoclypeal suture present; anteclypellus with median longitudinal carina, clypeal suture curved with apex slightly broader than base; gena ( Fig 1. B View FIGURE 1 ) broad with disc concave, sparsely punctuate. Pronotum shorter than exposed part of mesonotum and scutellum ( Fig 1. C View FIGURE 1 ), with anterior margin arched; lateral margin short; hind margin concave, with dense wrinkles. Forewing ( Fig 1. E, F View FIGURE 1 ) crimped at apex of clavus, with four apical cells and three anteapical cells; appendix broad and extending to the wing apex. Profemur ( Fig 1. G View FIGURE 1 ) with intercalary (IC) row represented by irregular band of fine setae; AM 1 seta enlarged, situated near apex. Metafemur with apical setal formula 2+1.

Male pygofer ( Fig 2. J, K View FIGURE 2 ) side moderately long and triangular without posterior process; tapering distally, with several macrosetae. Valve ( Fig 2. K, L, M View FIGURE 2 ) semicircular. Subgenital plate ( Fig 2. J, K, L, M View FIGURE 2 ) long; wide basally, tapering distally and sharply curved dorsad; with numerous short fine hair-like microsetae arising from lateral margin, irregularly arranged. Style ( Fig 2. K, L, M, N View FIGURE 2 ) apical process elongate and digitate; lateral lobe prominent process with microsetae. Connective ( Fig 2. O View FIGURE 2 ) Y-shaped; stem slender and arms robust; stem about as long as anterolateral arms, bifurcate apically. Aedeagal shaft ( Fig 2. J, P, Q, R View FIGURE 2 ) curved dorsad, with pair of elongate laterobasal processes extending along shaft nearly to apex of shaft; gonopore ( Fig 2. P, Q View FIGURE 2 ) apical on ventral surface. Segment X ( Fig 2. J View FIGURE 2 ) short, sclerotized laterally and dorsally.

Female genitalia. Hind margin of 7 th sternite ( Fig 1. I View FIGURE 1 ) with V-shaped notch and lateral margin truncate. 3 rd valvulae ( Fig 1. I View FIGURE 1 ) slightly exceeding apex of pygofer.

Material examined. Holotype ♂: Indonesia, Sulawesi Utara, Dumoga-Bone National Park , 0 1 May 1985, Edward’s Camp 664m, at light, coll. J.H. Martin. Paratypes: Indonesia, Sulawesi Utara, Dumoga-Bone National Park , 13♂ 2♀, February 1985; 1♂ 1♀, May 1985, Toraut. nr base camp, ca 200m, M. R. Wilson; 1♀, June 1985, same data as holotype ; 1♂, Toraut, 0°34′N, 123°54′E, 6 July 1985, light trap sample, forest, River Tumpah , coll. A. H. Kirk-Spriggs ( NMW). All Royal Entomological Society London, Project Wallace, ( BMNH except where indicated) GoogleMaps .

Etymology. The new species epithet originates from the Latin word “ stilla ” for “drop”, referring to the pronotum and scutellum being surrounded by a drop-shaped ivory band.

Remarks. This new species is similar to D. vilbastei Zhang & Webb, 1996 but can be distinguished from the latter by the pygofer side without process (processes present in D. vilbastei ); style lateral lobe more pronounced and aedeagus with laterobasal processes nearly as long as the shaft (processes shorter than shaft in D. vilbastei ).