Krisna strigicollis Spinola
Creators: name: Viraktamath, C. A.
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Cicadellidae
Krisna
Krisna strigicollis

description: Krisna strigicollis (Spinola)
Figs 21, 29, 34, 80–87
Siva strigicollis Spinola 1850: 128. Type sex? India: Coromandal [not examined]
Krisna strigicollis (Spinola): Kirkaldy 1900: 243; Distant 1908: 297, Fig. 189.
Green with a reddish brown to black marginal spot on head, medially interrupted where it enlarges into larger spot; in some specimens seen as black spot on either side of median line.
Head medially longer than next to eyes, fore margin distinctly rimmed, surface on rim rugose with a strong carina dorsally, another less prominent carina on lower margin, disc of vertex transversely wrinkled, frontoclypeus depressed beneath rim, roughly sculptured, 4–5 carinae below ocelli on ocellocular area. Ocellus almost contiguous with adjacent eye. Pronotum about 2.5 times as long as vertex, about as long as or slightly shorter than scutellum.
Abdominal tergites without apodemes, apodemes of abdominal sternite 3 very well developed reaching posterior margin of 2nd abdominal segment, diverging, each apodeme both laterally and mesally concave with much longer lateral extension distally. Apodemes of male abdominal segment 4 well developed, broader than long, medially rather contiguous. Male eighth sternite broader than long, with hind margin medially concave lateral angles rounded, entire area in apical half covered sparsely with setae.
Male genitalia: Ventral pygophore process enlarged at distal 0.33 then tapered asymmetrically, distal half of enlarged area longitudinally rugose. Subgenital plate with Vshaped excavation near proximal area on mesal margin. Style with apophysis of type 2. Aedeagus robust, broadest at midlength, gonopore visible as a tube between 2 margins of trough formed by concavity of aedeagal shaft on ventral margin, dorsal margin with rough sculpturing in C-shaped concavity, in lateral aspect apical 0.33 of shaft much narrower.
Female genitalia: Hind margin of seventh sternite slightly concave medially, with rounded lateral angles. Second pair of gonapophysis with undulated margin between distal 2 prominent teeth, also on margin beyond distal prominent tooth, ventral margin with subapical notch, dorsal margin before proximal prominent tooth serrated for short distance.
Measurements: Male 10.17 (9.50–11.60) mm long, 2.60 mm wide across eyes, 3.30 (3.20–3.60) mm wide across hind margin of pronotum. Female 11.60 (10.90–12.30) mm long, 2.90 mm wide across eyes, 3.70 (3.60–5.90) mm wide across hind margin of pronotum.
Material examined: India: West Bengal: 2 ď, 3 Ψ, Calcutta, 22.xi.1981; 1 ď, Kalimpong, 1780 m, 6.vi.2005; Karnataka: 1 Ψ, Mudigere, 5.vi.1979; Kerala: 1 ď, Maraiyur, 1066 m, 24.iii.1977, all collected by C.A. Viraktamath; Trichur: Mannuthy, 25.xi.1976, at light, G. Mathew; 1 Ψ, Walayar, 26.x.1975, C. A. Viraktamath; Malabar: Walayar forest, 1000ft (303 m), vi.1957, P.S. Nathan (IRSNB); India: Neerlandaiser, Suyoscerbuyk (IRSNB). Nepal: 1 Ψ, near Birganj, Lothar, 450 ft (137 m), 9.ix.1967, Canadian Nepal Expedition (CNC).
Remarks: Specimens from Thailand (2 Ψ, IRSNB) and Philippines (1 ď, 1 Ψ) were also examined during the study. All specimens studied have two black transverse spots on the anterior margin of the head. Males also possess prominent basal abdominal apodemes. Selenocephalus costalis Stål (1859: 290) from Malay Peninsula, currently a junior synonym of this species, is probably a species distinct from K. strigicollis. The anterior rim of its head is very similar to that of K. magna Baker (Fig. 20). In K. magna the rim and vertex do not bear any striae, but these are present in K. strigicollis. K. magna is also very robust and has a more strongly arched pronotum than does K. strigicollis. Another current synonym of K. strigicollis is K. stramineus Walker. The female type of the latter species (BMNH, figured by Distant, 1908, fig. 189) matches K. strigicollis but is labeled from Java. However, examination of numerous specimens from the Pacific by M.D. Webb (BMNH) has revealed no further matching specimens, e.g. with two spots on the forehead. It is concluded therefore, that this may be a mislabeled specimen. The male genitalia of a specimen from Java was figured as K. strigicollis by Linnavuori and Quartau (1975, fig. 100a–d), but the aedeagus does not match the specimens figured here and it is concluded that this is a misidentification. Also, in the same paper the figure of K. kirbyi (fig. 100e), without locality data, appears to be that of K. varia.
This species resembles K. bakeri and can be easily recognized by the spots on the forehead, ocelli being very close or contiguous with the adjacent eyes, and the strongly developed abdominal apodemes in addition to the structure of the aedeagus and the apex of the apophysis of the style. From K. bakeri it differs in the shape of the aedeagus, style, and abdominal apodemes; the ventral margin of aedeagus is uniformly curved in K. bakeri whereas it is slightly concave at midlength in K. strigicollis.
description: Published as part of Viraktamath, C. A., 2006, Revision of the leafhopper tribe Krisnini (Hemiptera: Cicadellidae: Iassinae) of the Indian subcontinent, pp. 1-32 in Zootaxa 1338 on pages 24-26, DOI: 10.5281/zenodo.174332