RHYACIA. By Dr. A. Corti and Dr. M. Draitdt. 
69 
Rh. suspicax sp. n. (9g). Denoted by Corti as a new species from 2 from the Taurus. Tt is paler suspirax. 
grey, with coarser dark .irrorations, otherwise closely resembling squalida ; the markings are more distinctly 
black, especially the anterior transverse line; the subterminal line appears to be more distinct owing to darker 
interspersions on the inner side, in contrast to the paler marginal area. Orbicular stigma is both larger and 
elongated to a sharper point. Hindwings much whiter, scarcely darker at margin. 
Rh. confinis Stgr. (9 g) is not identical with squalida, but is a separate genuine species. It is much con j bus. 
paler grey and the colour is more uniform, transverse stripes sharply defined and distinct, they have not paler 
edges. Also the stigmata are not paler than the ground colour, but simply outlined by delicate black, the 
orbicular stigma being larger than in squalida-, subterminal line is indicated by a darker edging on inner side, 
in contrast to the paler marginal area. Hindwings more uniformly pale grey-brown, slightly darker towards 
margin. Fairly widely distributed in western Asia, from N. Persia to the Altai. 
Rh. inermis Corti. ined. (9 h). This is another closely related species. It is perhaps a shade darker inernw s. 
than the very similar vadosa, but whilst in the latter the markings are clearly distinct, in inermis they are 
scarcely discernible in the dark ground. Stigmata and transverse lines are only faintly indicated; the narrow 
marginal area is somewhat paler, the subterminal line thus indicated is less undulate than in the other species. 
Hindwings more whitish, beyond the faintly darker subterminal line there is a narrow white marginal area 
and at the base of fringes there are interrupted blackish marginal streaks. Kuku-nor. 
Rh. subuniformis Corti ined. (9h). This is close to confinis, but more uniformly coloured although subuntfor- 
somewhat more irrorated. The transverse lines are much more faint and diffuse, of the posterior line only dots mtS 
are discernible on the veins. The stigmata are only indistinctly outlined. Nothing is visible of the subterminal 
line and the heavy black marginal dots are very characteristic, as they are absent in the other species. Fringes 
somewhat paler than the ground colour. Hindwings pale, there is no darkening at the margin, in fact the base 
seems to be slightly duskier than the margin. Veins are tinted faintly brownish. From Thibet. 
Rh. solida Ersch. (Vol. 3, p. 33) (9 h). This shoidd not be placed in the Euxoa, but in close proximation solida. 
to the preceding species. It is very pale luteous, almost devoid of markings, only a few faint black dots on 
the veins as indications of the transverse lines and at margin, as in subuniformis, there are also delicate black 
dots. Hindwings still paler, faintly duskier towards margin. Veins faintly tinted with brownish. Kok-hand. 
Rh. vacillans Corti ined. (9h). This is another very similar species of this difficult group. It can be vacillans. 
differentiated by the uniform dark colour, which is most similar to that of squalida, but the transverse lines 
are not so distinct, being less curved, with flatter arcs and more heavily black without paler edge. The stigmata 
are scarcely paler, similarly heavily circumscribed by black without however being sharply outlined. Marginal 
area somewhat paler, a fine pale line anterior to the dark base of fringes. Hindwings much darker than in 
related species with more delicate dark line before the pale whitish fringes. Altyn-tag. 
Rh. flacca Corti ined. (9h). Also this species still belongs in the squalida group. Forewings uniformly flacca. 
and smoothly luteous, without irrorations. Markings like in the previous species, the transverse lines somewhat 
less undulate, the posterior one more distinct, owing to dark spots on the veins. It has no paler edge. The stig¬ 
mata are small and without paler centres. Between them there is a darker oblique central shade. Subterminal 
line is only faintly indicated, being almost extinct. Fringes somewhat paler. Hindwings uniformly grey-brown, 
scarcely darker at margin. Apparently this is a fairly common species, that is often mistaken for squalida. 
It occurs at Issyk-kul and Aksu. 
Rh. moechilla Pglr. (Vol. 3, p. 29). We can now give an illustration of a typical specimen of this nice moechilla. 
species ex the collection of Corti (9 i). It should not be placed with the Euxoa, but certainly belongs here. 
Rh. cucuna Pglr. (Vol. 3, p. 30, pi. 6 cl). This also should not be classified with the Euxoa, but belongs cucuna. 
in the same group as the preceding species. As the illustration in the Main Volume was not very successful, 
we are giving a better picture here (9 i). 
Rh. squalidiformis Corti ined. (9i). Under this name a somewhat smaller representative of this group squalidi- 
of species is classified in the collection of Corti. It is from Amasia and is paler, but with more irrorations 
than squalida. Orbicular and reniform stigmata have rather darker centres and it is distinctly different from 
other species by the presence of a claviform stigma, which is absent in the others. The posterior transverse 
line is marked by dots on the veins, subterminal line is quite extinct, on the margin there are heavy black 
dots. Hindwings pale as in suspicax and inermis. 
Rh. opisoleuca Stgr. (Vol. 3, p. 34, pi. 7 f). This was classified in the Main Volume among the Euxoa, but opisolcuca. 
should certainly be placed here. The old illustration was bad and we are giving a better one here (9 i). It is very 
similar to squalida and especially to vacillans but it is browner with more indistinct and diffuse markings. Hind¬ 
wings much darker than squalida. — obsoletipicta Strd. from N. Persia has markings of forewings effaced. obsoletipic- 
Rh. aucta Alph (Vol 3, p. 49, pi. 12 d). The illustration in Main Volume is not recognisable, we are aucta. 
giving an illustration of a typical specimen ex the collection of Corti (9 i). It is larger and with wider wings 
