262 
ORTHOLITHA. By L. B. Prout. 
nasi fera. 
similaria. 
microgyna- 
ria. 
arthuri. 
roseicilia7 
arrhodea. 
rose} fascia. 
duplicata. 
subfimbria- 
ia. 
eurypeda. 
11. Genus: Ortholitlia Hhn. 
(See Vol. 4, p. 158; Vol. 16, p. 86.) 
I have remarked elsewhere that it is doubtful whether this is a natural genus. Its differentiation from 
Xanthorhoe has been made dependent chiefly on the elongate costal margin of the forewing, but this shows 
every intermediate gradation in the African, Australian and New Zealand faunae. As regards the <$ genitalia, 
the so-called canaliculus of Pierce (“central projecting lip or groove of the juxta”) w'as not considered by 
the late Mr. Burrows a satisfactory character and the other given distinction — the broad, platelike chitiniz- 
ation of the costa of the valve — seems also too inconstant to be of use; indeed Janse’s investigation of the 
South African Ortholitha and Xanthorhoe, published since I dealt with them in Vol. 16, has discovered no definite 
line of demarcation between the two genera. I therefore only leave here the few Indian and Chinese species 
which may have real affinity with those that have been called Ortholitha in Vol. 4. 
A. (j antenna bipectinate. 
0. nasifera Warr. (Vol. 4, pi. 11 a) has quite the facies of several of the Palaearctic Ortholitha, but 
may easily be distinguished by the single sharply-pointed central projection of the median area distally; 
the median area, as in similaria and others, is divided by a whitish central stripe into two narrow dark bands; 
apical dash developed. Kashmir to Simla, local, type from Thundiani. 
0. similaria Leech (Vol. 4, pi. 11a) is lighter, browner, with the median area of the forewing broad 
at costa and at the bilobed central part, but with a rather deep curve inward between these two parts, though 
scarcely so deep in this W. Chinese race as in the subspecies erschoffi Alph. (Vol. 4, p. 161). Distributed in 
Szechuan. 
O. junctata (Vol. 4, pi. 7 g) microgynaria Hmps. (26 d). Narrower-winged and somewhat greyer than 
the name-typical race, which was described from the Ala Tau and is widely distributed in Central Asia; cell- 
mark of forewing as a rule smaller than in any but rare aberrations of j. junctata. The $ is notably small and 
narrow-winged. Kashmir, chiefly in Gurais Valley. 
0. arthuri sp. n. (26 e). $ 40 mm, $ 37 mm. Evidently related to microgynaria; larger, costa of fore¬ 
wing and apices (both wings) somewhat more rounded, colour a little darker, greyer (less brown); forewing with 
subbasal line more curved outward, antemedian with a pronounced outward bay in the cell; fringe more notice¬ 
ably chequered with brown, especially on its whitish distal half. Underside also dark compared with that of 
microgynaria , the postmedian line of the hindwing (when visible) more bent in the middle. Kashmir: Gurais 
Valley (type <$) and Koksar (a pair) all from the Leech collection, taken by H. Me Arthur. 
0. roseicilia Hmps. (26 d). This very distinct species was referred by its author to the present genus, 
under its synonym of Eubolia. and is retained here until its affinities have been explored. Wings broader and 
of a more delicate texture, the unmarked hindwing and almost unmarked underside, as also the palpus, pect¬ 
inations and venation, conformable to Ortholitha. Described from Bhotan, since received from Sikkim-Tibet, 
evidently a liigh-altitude species. — ab. arrhodea nov. absolutely lacks the rosy scaling of the bands and fringes, 
which remain of the ground-colour. Chumbitang, Tibet, 13 000 feet, a $ in the British Museum, collected with 
a typical, strongly rosy-marked ( J. 
0. roseifascia Hmps. (26 e). Wings slightly less broad and more robust. Head, thorax and base of 
abdomen above more strongly suffused with rose-colour. Forewing very much yellower, the rosy bands more 
deeply coloured, the median decidedly broader and with its distal edge more sinuous, more strongly projecting 
between 3rd radial and 2nd median, subterminal white spots on the whole smaller, with scarcely any trans¬ 
verse connecting shade; forewing beneath with much less extended smoky suffusion. Sikkim, 12 000 feet (Knyvett), 
type $ and another; Kulu (Capt. Graham Young), 1 fjh Notwithstanding the strong superficial dissimilarity, 
I feel confident that this will prove to be the $ to the preceding (of which I only know $$), but as it bears 
the prior name I am loth to make the union until both sexes have been collected in one locality. 
0. duplicata Warr. (26 e) was another unmistakable species until the closely similar eurypeda (see below) 
was discovered. The name-typical form, here figured, has the hindwing very weakly marked on the upperside. 
Sikkim-Tibet; the originals came from the Chumbi Valley. subfimbriata Prout (Vol. 4, pi. 12 b, as duplicata, 
Suppl.-Vol. 4, pi 7 b) has a better developed smoky band at or close to the termen of the hindwing above, divided 
by the white subterminal line; in the sometimes also in the the postmedian of the hindwing is also more 
or less developed on the upperside. Szechuan, etc. 
0. eurypeda Prout (Suppl.-Vol. 4, pi. 8 g) is somewhat larger, the pale areas of the forewing almost 
entirely without a yellowish tinge, the hindwing very white, even more weakly marked than in d. duplicata, 
bands of forewing perhaps slightly browner, the whitish subterminal line more slender, generally continued 
