Iassinae

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 : 263

Subfamily Iassinae

Tardrabassus pakneunensis Dai & Dietrich, 2012

( Figures 8 A–H)

Description of female. Similar to male in overall structure but coloration lighter, transverse yellow band of face less well delimited and transverse preapical band of forewing complete. Dorsum chestnut brown, pronotum with numerous irregular small yellow spots, scutellum bright yellow. Rostrum slender, apex not expanded. Sternite VII quadrate, wider than long, posterior margin with small median trapezoidal emargination flanked by pair of short, acute processes, lateral lobes truncate. First valvular elongate, slender, broadened preapically with ovoid patch of strigate sculpture not extended to margins. Second valvula elongate and slender with pair of widely spaced preapical teeth, apex obliquely tapered. Gonoplacs without macrosetae.

Material examined. Two females, VIETNAM: Thua Thien Hue, A Lýới District, A Roàng, 4 May 2005, 600– 700 m ( VNMN) .

Notes. This species was described based on two male specimens from a village on the Mekong River in central Laos collected in 1918. It is here recorded from Vietnam for the first time based on recently collected material. The species was tentatively placed in Iassinae but Dai & Dietrich (2012) noted that it exhibits a combination of traits also found in Tartessinae and in the Deltocephaline tribe Drabescini . Two females recently collected in Vietnam are here considered conspecific with the males from Laos. The ovipositor structure appears to confirm that placement in Iassinae is correct. The second valvulae have two widely spaced preapical teeth, a characteristic that appears to be unique to this subfamily although it does not occur in all iassines. The first valvulae are unique among iassines in having an ovoid patch of strigate sculpture preapically. Sexual dimorphism in the structure of the lower part of the face is common in leafhoppers, occurring sporadically among members of several subfamilies including Deltocephalinae , Eurymelinae , Iassinae and Typhlocybinae . Usually this variation is manifested in a relatively swollen anteclypeus and lorum in the male. Sexual dimorphism in the shape of the rostrum, as occurs in Tardrabassus , appears to be less common, having been reported previously only in Eurymelinae (sensu lato; Xue et al. 2020).

Figures

FIGURE 8. Iassinae and Hylicinae. A–H, Tardrabassus pakneunensis Dai & Dietrich, female: A–B, lateral and dorsal habitus; C, face and anterior part of thorax, ventral view; D, sternite VII, ventral view (left side damaged); E, gonoplacs; F–G, first valvula; H, second valvula. I–O, Traiguma hamocauda sp. n., holotype male: I–J, lateral and dorsal habitus; K–J, genital capsule, lateral ventral views; M, pygofer, ventral view; N, subgenital plates, ventral view; O–P, genitalia, ventral and lateral views; Q, aedeagus, posterior view.