74 
RHYACIA. By Dr. A. Corti and Dr. M. Drattdt. 
riffelensis. 
iveni. 
alpina. 
norvegica. 
coraxa. 
siraminea. 
alexis. 
herrich- 
schaefferi. 
vittata. 
subvittata. 
libetana. 
par vulci. 
hoferi. 
dahlii. 
fusca. 
provincia- 
lis. 
canescens. 
subdolens. 
satisfactory in colouration. — riffelensis Obth. (10 k) is the larger and darker grey form from higher altitudes in 
the Swiss and tyrolese Alps (for instance Zermatt, Riffelalp, Ortler territory etc.). — iveni Hbn. We do not 
consider this to be identical -with alpicola and are illustrating a very typical specimen (10 k). It is probably 
the largest alpine form. — alpina Humphr. and Westw. We are able to give an illustration of this nice Scotch 
and Iiish form (10 k). It is said to have been taken, according to Vorbrodt, in a few odd specimens also 
on the Riffelalp and in the Albula Pass. — norvegica Strd. differs from alpina by large, well marked stigmata, 
which are filled with grey-white scales. The reniform stigma however has a rusty red centre without a dark 
inner spot. Hindwings darker dusky brown. S. W. Norway. 
Rh„ coraxa Pglr. (Vol. 3, p. 36, pi. 7 k). The illustration was bad and we are giving a better one here (10 1). 
Rh. straminea Leech. (Vol. 3, p. 37, pi. 11 d). According to its structure this species must be classified 
here, whilst according to its appearance this would not be the case. From Corti’s notes it forms a group 
with lorezi and destituta, but I cannot think this is correct. 
Rh. alexis Kozh. The author creates the Genus Estimata (Kozh .) for this and the following species. 
Thorax is hairy, antennae pectinate and $$ have stunted wings. At the best they might claim the rank 
of a subgenus. They are very similar to herrich-schaefferi and are not larger than same. Ground colour grey, 
intermixed with yellow, white and dark scales, with white and browm markings, differing by the grey basal 
area, wider reddish brown central area, the stigmata which are pale but without dark circumscriptions, the 
quite round orbicular stigma and the cell between the stigmata, which is not darker. The grey marginal area is 
narrower, subterminal line dark brown. Hindwings dark grey without central spot and with pure white fringes. 
Wing expanse: 25—28 mm. Semiretshje (Dzhaidak mountains). 
Rlt. herrich-schaefferi Alph. (Vol. 3, p. 37, pi. 12 g). Also this, one of the smallest species, does not 
appear to really belong here. The illustration was unrecognisable and we are therefore giving a better one 
here (10 k). 
Rh. vittata Stgr. (Vol. 3, p. 37, pi. 8 a). The illustration was not bad, but we are giving a better one 
here (101). 
Rh. subvittata Corti (10 1). Described from specimens in the Coll. Oberthur. This species closely resembles 
the preceding one but is much smaller and can be distinguished by the completely absent orbicular stigma so 
that the costal streak together with the median nervure and the reniform stigma enclose an uninterrupted 
dark wedge-shaped area. Hindwings are paler than vittata. The type emanates from Ta-tsien-lu. 
Rh. tibetana Stgr. (Vol. 3, p. 37, pi. 8 a). In Corti’s lists this species is placed next to pallescens Btlr., 
which is a Gerastis. This classification would perhaps be preferable. 
Rh. infantilis Stgr. (Vol. 3, p. 37, pi. 8 a). 
Rh. parvula Pglr. (Vol. 3, p. 37, pi. 8 a). The illustration in Main Volume is not satisfactory and we are 
illustrating this small species again here (101). 
Rh. pancta Pglr. (Vol. 3, p. 37). 
Rh. hoferi Corti (121). Corti also places this extraordinary species in the Subgenus Epipsilia, although 
it does not seem correct. Thorax black-brown, collar contrasting yellowish white. Forewings bluish grev- 
white to postmedian, dusted with brownish especially at inner margin of central area and with very heavy 
black basal streak. Transverse lines double interfilled with slightly paler colour. Orbicular stigma forming 
a small circle with black central dot. Reniform stigma velvety black with distinct blue-white circumscription, 
between the two a deep velvety brown central shade, which is bent in a rectangle at lower end of cell. Before 
the subterminal line is a wide faintly darker grey band. Hindwings pale brownish grey with whitish fringes. 
Ta-tsien-lu, from a single <$. 
Subgenus: Diarsia Him. 
Rh. dahlii Him. (Vol. 3, p. 46, pi. 10 e). The illustration is not bad, but it is rather too dark for 
the most usual form; such $9 specimens are denominated: — fusca Lenz. The deep black dot at tip of 
claviform stigma, which is never absent is particularly characteristic of this species and always enables one 
to recognise same. In the collection of Dr. Corti there are a number of new forms of this group, which clearly 
were in part intended to be described as species. — provimcialis Corti ined. (He). This is a robustly built rich 
brown form, well marked with bold dark bands in cliscal and subterminal areas. Especially the latter contrasts 
strongly from the paler marginal area. From Cogne. — canescens Btlr. (11 e). As will be seen from our illustration 
this is by no means identical with subdole?is. It is an especially large form with sleek wing contour. Col¬ 
ouration is blackish brown with purplish grey hue and not red-brown. — subdolens Btlr. (11 e). On the other 
hand this is somewhat smaller, but nevertheless larger than the european form. It does not vary much from 
the type in colour, but the dark subterminal band is always distinct and pronounced. Corti seems to have 
thought it possible, that this was a separate genuine species. From Sutschansk. 
