Rhotana jacobsoni Zelazny, 2011

Zelazny, B. & Webb, M. D., 2011, 3071, Zootaxa 3071, pp. 1-307 : 69

Rhotana jacobsoni Zelazny , sp. nov.

( Fig. 197)

Description. Forewings 2.0 times longer than wide, length 5.3–5.9 mm. Colour stramineous to light brown; basal half of forewings and a band along apical crossveins lightly infuscated, the margins of this band darker; veins stramineous to faintly orange, last subcostal sector and short sections of C, Sc, R, and M darker orange. Hindwings lightly infuscated but clavus and apical quarter colourless; a dark brown mark at base of Ms2, extending backwards into a dark stripe which ends near the apex of Cu; apical cross-veins between Sc, R, and M bright white, in holotype (but not in paratype) accompanied by brown stripes; remaining veins stramineous. Facial carinae contiguous up to lower level of eyes; rostrum not quite reaching hind coxae; subantennal processes and lateral carinae of pronotum little developed. Forewings with apex of Sc slightly sinuate; Sc+R fork slightly distad of basal third of wing; Ms1 branched just distad of apex of basal median cell; Ms1b connected to apical part of Cu1 by a cross-vein, a small triangle at base of Ms1. Male genitalia with pygofer slightly and roundly produced at the sides; genital styles elongated; proximal dorsal process short with a small hump at its base; distal dorsal process elongated. Apical part of aedeagus with a short, longitudinal impression, ending in a short, membranous lobe.

Etymology. The species is named for the collector, E. Jacobson whose careful collections produced many well preserved specimens from Sumatra, and ' jacobsoni ' is a latinized noun used in the genitive case.

Type material. Holotype ♂ (forewing 5.9 mm), INDONESIA: SUMATRA; label: Fort de Kock / (Sumatra) 920 M/ 1924/ leg. E. Jacobson ( RMNH) . Paratype. WEST MALAYSIA: Pahang, Fraser's Hill , 4000 ft. 30. VI .1933, 1 ♂ (fw. 5.3) ( BMNH) .

Distribution. Sumatra, West Malaysia.

Diagnosis. Rhotana jacobsoni closely resembles R. formosana Matsumura , R. obaerata Yang & Wu , and R. satsumana Matsumura , all three from Taiwan and surrounding countries, as well as R. transversolinea Melichar , also from Indonesia and Malaysia. It can be separated from these by the hindwings bearing a dark spot at the base of Ms2, which extends into a narrow line backwards.