68 
RHYACIA. By Dr. A. Corti and Dr. M. Draitdt. 
violetta. Rh. Violetta Stgr. (Vol. 3, p. 51, pi. 11 c). The illustration in Main Volume is not good, we are giving 
a fresh one (9 e). The species is remarkable by the narrow, paler marginal area of forewings and the small 
pale orbicular stigma with its definitely dark centre; the transverse lines are somewhat paler. Fringes with 
darker checks. Hindwings pale, increasingly dark towards margin. 
socors. Rh. socors Corti (9 e). This is close to sollers, helvetina and also lucernea. Body and wings yellow- 
brown, markings rather diffuse, transverse lines rather more distinct, of the stigmata only the small reniform 
stigma is visible, anterior to same a dark diffuse central shade is indicated; outwardly of subterminal line 
there is a pale buff band, which gradually becomes darker towards the margin. Hindwings barely paler than 
forewings, only slightly so towards the base and having white fringes. Alexander Mountains; Djarkent 
(Tokmak). 
helvetina. Rh. helvetina Bsd. (Vol. 3, p. 51, pi. lie). The following fresh denomination has been given to an 
fasciata. aberration: — fasciata Vorbr. with distinct dark middle shade. Described from Gaclmen. — Besides there are 
pyrenaica. the following races: — pyrenaica Bours. of smaller size than the Swiss specimens and of pronounced yellowish 
plumbina. ground colour. East Pyrenees (Porte) and Hautes Pyrenees (Gedre), — plumbina Wgnr. (9f) from Meran, 
Martell valley, is also a distinct race of almost dark slate-grey colouration. — The larva is unusually long 
and slender, of velvety dark blue-black colouration — “like ripe bilberries” — with pale brown legs and without 
discernible dorsal or lateral lines. It is superterrene, i. e. not a subterraneous feeder and spins up in a frail 
puparium close to the surface of the ground. 
gilva. Rh. gilva A. B.-H. has very similar markings to helvetina and is probably closely related, but the 
ground colour is pale yellowish. Forewings narrower with distinctly prominent central area, orbicular and 
reniform stigmata paler and more distinct, claviform stigma is absent. The marginal area is devoid of markings 
and with very faint dividing line in the yellow fringes. The unicoloured hindwings vary little in colour from 
forewings. Wing expanse: 40mm. Taurus (Aintab). 
plumbea. Rh. plumbea Alph. (Vol. 3, p. 52, pi. 12 i). The old illustration, which was made from a copy is now 
arschanica being replaced by a better picture (9f). - arschanica /. n. (9 f) is a smaller, darker form with more diffuse 
markings; the white definition of the stigmata and transverse lines is absent and this is especially noticeable 
in the darkly shaded reniform stigma. From East Turkestan. 
subplumbea. Rh. subplumbea Stgr. (Vol. 3, p. 52, pi. 11 e). This illustration also was bad and we are giving a better 
one (9f). Also the description was incorrect. Forewings are by no means brownish fuscous, but very dull 
leaden grey to grey-black, the stigmata with faintly paler surrounds, the transverse lines extinct, only faintly 
indicated by yellowish scales, the outer line more sharply dentate. Hindwings impure grey, paler towards 
the base, darker at margin with discal lunule and dark transverse line. Underside more whitish, only more 
darkly suffused at costa. It occurs between Lob-nor and Kuku-nor. 
diplogram- Rh. diplogramma Hmps. (Vol. 3, p. 52, pi. 11 f). The illustration of this small and insignificant species 
ma - is quite unrecognisable and we are giving a better one here (9f). Forewings grey with ochreous admixture 
and peppered with brown, the anterior transverse line double, the posterior one single, dentate, with yellowish 
outer edge, between them a dark central shade; instead of the subterminal line, there is a row of ochreous dots 
with dark sagittate marks anteriorly. 
proterva. Rh. proterva Pglr. (= gregalis Corti i. 1.) (Vol. 3, p. 51) (9g as “gregalis”). A small species, that at 
first glance looks like diplogramma, also like a small devota. Antennae with shorter fasciles of cilia than diplo¬ 
gramma, forewings with more elongate apex and wider outer margin; colouration greyer, markings otherwise 
similar, fringes whitish. Hindwings brownish grey. From Altyn-tag. 
hampsoni. Rh. hampsoni A. B.-H. (lli) is a very remarkable small species, that superficially resembles various 
Anarta species. Forewings grey-black with greenish sheen, partially bestrewn with yellowish. Orbicular and 
reniform stigmata somewhat darker black than ground colour, both transverse stripes indicated by yellowish 
lines, also a faint subterminal line before margin. Fringes yellowish. Hindwings grey-blackish with white 
fringes. From the Juldus territory. 
squalida. Rh. squalida Gn. (Vol. 3, p. 49, pi. 11 g). The synonym confinis should be annulled. We are in a 
position to illustrate Gitenee's type ex the collection of Corti, ex coll. Oberther (9g). The moth is much 
greyer than the illustration in the Main Volume and the markings are more delicate. 
vadosa. Rh. vadosa Corti (9g) is certainly very close to squalida, but it is much darker, so that the markings 
are less visible on the darker ground. Otherwise it is very similar, but the reniform stigma is much wider 
and the posterior transverse line has not a paler outer edge. Nothing can be seen of a paler subterminal 
line and the extremities of fringes are scarcely paler. Also the hindwings are much darker, especially at 
margin, whilst the whitish fringes contrast more vividly. Probably the Uliassutai specimens classified by Stager 
as “ confinis” should be placed here. Changai Mountains. 
