Abrus digitatus, Dietrich & Nguyen & Pham, 2020

Dietrich, Christopher H., Nguyen, Huong T. T. & Pham, Hong Thai, 2020, New genera, new species and new records of leafhoppers (Hemiptera: Cicadellidae) from Vietnam, Zootaxa 4877 (2), pp. 241-273 : 242-244

Abrus digitatus n. sp.

( Figures 1 A–N, 11D)

Description. Length of male 8.2 mm, female 9.0 mm. Overall color light brown; crown with pair of small black apical submedial black spots flanked by larger pair of black maculae bordering ocelli posteriorly; pronotum with pair of small submedial spots, lateral margin with black band just below carina; forewing venation pale brown, central and inner anteapical cell each with small black spot; legs with uniform tan color except bases of macrosetae dark.

Front femur IC row with 5 fine setae, AV row continuous with IC and bearing 10 moderately long stout setae and 4 distinctly shorter setae near base; row PV with 3–4 setae; tibia rows AD and PD each with 7 macrosetae, AV and PV each with numerous macrosetae. Hind tibial formula PD:AD:AV 20:13:22, first tarsomere pecten with 3 platellae. Forewing venation complete, inner apical cell closed, clavus with 1–2 extra crossveins.

Male pygofer produced posterodorsally, apex of lobe divided into two acute processes subequal in size with elongate digitiform membranous process extended between them; macrosetae divided into distinct posterodorsal and basoventral groups. Subgenital plate ovoid in ventral view, macrosetae arranged in narrow sublateral band. Style with preapical lobe very short and obtuse, apophysis relatively long and slightly sinuate, apex truncate with blunt lateral, mesal and ventral points. Connective with stem constricted medially, widened and truncate posteriorly, slightly shorter than anterior arms, arms only slightly separated anteriorly. Aedeagus with dorsal apodeme flattened antero-posteriorly, nearly parallel-sided in posterior view except for pair of short lateral preapical projections, deeply emarginate dorsally; large, knife-like unpaired dorsal process above base of gonopore-bearing shaft strongly compressed, broad and parallel-sided in lateral view, evenly curved dorsad, bearing pair of lateral flanges that give rise to pair of flattened acute preapical processes extended dorsolaterad; gonopore-bearing shaft relatively slender, tubular, tapered distally, curved dorsad and extended nearly to apex of dorsal process, with pair of slender preapical lateral processes extended ventrolaterad, apex arrowhead shaped; gonopore preapical on posterior surface.

Female sternite VII with posterior margin nearly truncate with very slight medial concavity, fuscous medially. First valvula moderately broad through most of length, tapered to sharp point distally, dorsal sculptured area submarginal, consisting of vertical rows of indistinct granules, ventroapical sculpture scale-like. Second valvulae relatively slender, slightly tapered beyond sclerotized dorsal saddle at midlength, dorsal margin without teeth or serrations, apex tapered to blunt point.

Etymology. The species name, a Latinized adjective, refers to the digitate distal process of the male pygofer.

Material examined. Holotype male, VIETNAM: Vinh Phuc, Tam Dao summit trail, 21.4622ºN 105.6473ºE, 970m 11 July 2019, C.H.Dietrich, sweeping forest understory, incl. bamboo, VN 19-6-1 (VNMN). Paratypes: 1 male, 2 females, same data as holotype ; 5 males, VIETNAM: Vinh Phuc, Tam Dao 21.4561ºN 105.6501ºE, 983m, 10-13 July 2019, C.H.Dietrich, Malaise trap in forest opening, VN19-7-2 ; 1 male, VIETNAM: Vinh Phuc, Tam Dao , 21.4533ºN 105.6480ºE, 942m, 12 July 2019, C.H.Dietrich, sweeping forest edge, VN19-9-2 ( INHS) .

Notes. This species resembles most other species of Abrus in external appearance but may be distinguished by the male terminalia. The new species appears to be closest to Abrus huangi Dai & Zhang , described from southern China (Guangxi), based on the pygofer structure, shape of the connective and overall structure of the aedeagus but may be easily distinguished by the smooth (not serrate) posterior margin of the basal aedeagal process, the dorsolaterally (not ventrolaterally) projecting processes of this same structure, and the broader (not tapered) style apex.

Figures

FIGURE 1. Deltocephalinae, Athysanini. A–L, Abrus digitatus sp. n., holotype male: A–B, lateral and dorsal habitus; C–D, genital capsule, lateral and ventral views; E, pygofer and anal tube, lateral view; F, valve and subgenital plates, ventral view; G–H, genitalia, ventral and lateral views; I, aedeagus, posterior view. J–N, A. digitatus female: J, abdominal sternite VII; K, first valvula, L, detail of same; M, second valvulae, N, detail of same. O–W, Aeternus ninhbinhensis sp. n., holotype male: O–P, lateral and dorsal habitus; Q–R, genital capsule, lateral and ventral views; S, pygofer and anal tube, lateral view; T, valve and subgenital plates, ventral view; U–V, genitalia, ventral and lateral views; W, aedeagal shaft and atrium (preatrium and ventral processes not shown), posterior view. X–BB, Hamulotettix ungulatus Dai & Zhang, female: X, sternite VII, ventral view; Y–Z, distal part of first valvula; AA–BB, distal part of second valvulae.