70 
RHYACIA. By Dr. A. Corti and Dr. M. Draitdt. 
veil/era. 
slabulorum. 
glis. 
ravidct. 
salva. 
muse ulus. 
quadrat) ga¬ 
la 
ledereri. 
mus. 
barbara. 
simulates. 
auguroides. 
pseudosi- 
mulans. 
subdecora. 
similis. 
than squalida, paler luteous, with more irrorations, the transverse lines sharply dentate, without paler edges. 
On margin there are heavy black dots with paler inner edges. Hindwings widely dusky at margin. Thibet. 
Rh. velifera Gorti ined. (9k). Another close relation to squalida. It is somewhat smaller than aucta 
and much darker, more smoothly scaled and without irrorations. Markings more distinct, both transverse lines 
simple, sharply dentate, the posterior one with faintly lighter outer edge. Claviform stigma present. A paler 
subterminal line is more distinct than in allied species and has very dark shading on inner edge. Hindwings 
about as in squalida. From Kuku-nor. 
Rh. stabulorum Bien. (Vol. 3, p. 49, pi. 10 k). The illustration in the Main Volume is a bad copy and w r e 
are giving a better illustration here (9k). It is easily recognisable by the much greyer colour, which has a 
faintly greenish hue and the transverse lines which have paler edges. Persia. 
Rh. glis Christ. (Vol. 3, p. 49, pi. 12 d). This is somewhat similar to the preceding species in markings 
and pale edged transverse lines, but the colour is entirely different, being a red-brown. The old illustration 
was not good, we are giving a better one (9 k). 
Rh. ra.vida Schijf. (Vol. 3, p. 49, pi. 10 k). This common and widely distributed species is very variable. 
In Corti's collection, designated simply as “var”. from Guberla and Minussinsk, there are specimens of very 
dark colour, which perhaps were intended to illustrate a race. We are illustrating one of these specimens (9 k). 
Rh. salva Gorti ined. (9 k). This looks like a small, narrow winged, very pale ravula with heavy irrorations 
and the delicate markings are only indistinctly visible in the patchy ground colour. The subterminal line with 
slightly paler edge towards the darker postmedian area. Hindwings very pale, whitish. From the Juldus. 
Rh. musculus Stgr. (Vol. 3, p. 50, pi. 11b). The illustration of this smallish species is unsatisfactory. 
We are giving a better picture here (91). 
Rh. quadrangula Zett. (Vol 3, p. 52, pi. 12 e). The illustration in Main Volume is unrecognisable, w r e 
are giving a better one here (91). The species is like the preceding, but it is of lighter colouration. It varies 
in the markings, but the transverse lines are usually fairly pronounced, the posterior one being double. The 
most striking feature is the dark quadrangular mark between the stigmata. 
Rh. rattus Alph. (Vol. 3, p. 52). 
Rh. ledereri Ersch. (Vol. 3, p. 52, pi. 12 e). The illustration in Main Volume is unrecognisable, rve are 
giving a better one of a typical specimen (9 1). The posterior transverse line is indicated by a double row of dots, 
behind these are sagittate marks before the pale wide subterminal line. On the margin there are also heavy 
black dots. The cell between the stigmata is filled with deep black, the claviform stigma is elongated and 
narrow. — mus Alpli.t (9 1) is a very dusky form without any pale patch. Corti seemed to hold the opinion 
that this was a genuine species. 
Rh. barbara Corti ined. (91). This is not far removed from ledereri, but it is much larger, with rather 
narrower wings and with greater irroration and more patchy markings. The dark interspersion of the cell 
between the stigmata is absent. Only the tip of the claviform stigma is faintly indicated. The sagittate 
marks in front of the subterminal line are absent and the marginal dots are only faintly present. Hindwings 
much paler than ledereri, somewhat darker towards margin. From the Alexander Mountains. 
Rh. simulans Hufn. (Vol. 3, p. 52, pi. 11 f). The illustration in the Main Volume is too brown, it should 
be much greyer. The species often has an almost greenish tone. — auguroides Rothsch. (10 a) according to 
Corti, is only a north African race. It is more brownish with irregular irrorations and indistinct stigmata. 
From Guelt-es-stel. 
Rh. pseudosimulans Kozh. (10 a). This is very similar to simulans, but larger on an average, the wing 
contour is somewhat wider, the colouration paler, often much more yellow r in tone. The markings similarly, 
but more delicately outlined. Hindwings inclined to be a shade darker. Differs in the genitalia. S. Russia, Cau¬ 
casus, Transcaucasia, Turkestan, Transcaspia (Askhabad), Siberia (Minussinsk). simulans is distributed through 
the forest regions of N. Russia and Asia, whilst pseudosimulans occurs chiefly in the Steppes of the south. 
Rh. nictymerina Stgr. (Vol. 3, p. 40, pi. 81). 
Rh. subdecora Stgr. (Vol. 3, p. 29). This species was not illustrated in Main Volume, we are now giving 
a good picture (10 a). It should not be classified with the Euxoa, but here. It also occurs in the Taurus (Marash). 
Rh. psammia Pglr. (Vol. 3, p. 40). 
Rh. similis Stgr. (Vol. 3, p. 40). This species, which is very like the preceding one, is now being illustrated. 
(10 a). It was not illustrated in the Main Volume and the present picture is successful. 
