Dayus upoluanus ( Osborn, 1934 )

Webb, Michael D. & Xu, Ye, 2022, Review of the “ red ” Empoascini leafhoppers in the genera Baguoidea Mahmood, 1967, Dayus Mahmood, 1967 and Homa Distant, 1908 (Hemiptera, Cicadellidae, Typhlocybinae) from Asia and the West Pacific, Zoosystema 44 (22), pp. 549-563 : 555-556

Dayus upoluanus ( Osborn, 1934)

( Fig. 2 G-N)

Homa upoluana Osborn, 1934: 190 , fig. 15.

Empoasca (Homa) upoluana – Metcalf 1968: 442.

Dayus upoluanus – Dworakowska 1971: 501. — Qin & Zhang 2007: 44.

DISTRIBUTION. — Samoa.

MATERIAL EXAMINED. — Paratypes • 2 ♂, 1 ♀, 1 specimen missing from mount; “Upolu Samoa ”; “Apia, 9-15-23”; “Swezey & Wilder”; “Brit. Mus. 1930-467”; NHMUK 013588829 • 1♂; “ Savaii , Samoa ” “ Safune, v.2.24”; “rain forest; 2000-4000”; “ H. Bryan Jr ”; “Brit. Mus. 1930-467”; NHM .

REMARKS

This species was described from 16 specimens of both sexes (holotype, allotype and paratypes) with original data: “Apia, 15.IX.1923 Swezey and Wilder” and two specimens, “Savaii, Safume, 2.V.1924, Rain Forest, 2000-4000 ft., Bryan”. In the introduction to Osborn’s article it states that type material collected by Swezey & Wilder and by Bryan was deposited in BPBM and duplicates in Ohio State University. However, some specimens of the former collectors are in the NHM (see Material examined), and from which the first images and male genitalia drawings of the species are given here ( Fig. 2 G-N).

Based on its male genitalia the species is only tentatively retained in Dayus as some diagnostic features of the genus are not present, i.e., the pygofer lacks a caudo-dorsal lobe, the subgenital plate lacks a basal setal group and the aedeagal shaft is very short without processes, all characters found in the similar D. euryphaessus (see above), although the aedeagus and connective are fused ( Fig. 2N ) and dorsal abdominal apodemes are present ( Fig. 2I ), as in other congeners.

Figures

FIG. 2. — Dayus Mahmood, 1967 species: A-F, Dayus euryphaessus (Kirkaldy,1907),A, B, holotype,dorsal habitus and labels respectively;C-F, types Empoasca euryphaessa rubrocincta Linnavuori,1960, C, D, allotype,dorsal habitus and labels respectively,E, F, holotype,dorsal habitus and labels respectively;G-N, Dayus upoluanus (Osborn,1934),G, dorsal habitus of female paratype;H, labels of same; I, male basal dorsal apodemes;J, male pygofer,lateral view;K subgenital plate, ventral view; L, Xth segment, ventral view; M, aedeagus, lateral view; N, aedeagus, connective and style, ventral view. Scale bars: A, C, E, 0,75 mm; G, 2 mm.