RHYACIA. By Dr. A. Cobti and Dr. M. Draudt. 
Rli. flavida Corti ined. (11 k). This species appears to be very isolated, but perhaps has affinities with flavida. 
subdecora and similis. Forewings and body pale yellowish with very faintly indicated grey transverse lines 
and outlines to stigmata. Between the stigmata a dark quadrangular mark. The subterminal line is indicated 
by grey dentate shadings on the paler marginal area. Hindwings grey-white. From Marash in the Taurus 
at an altitude of 800—900 m occurring in August-September. Type in the collection of Corti. 
Rh. asella Pglr. (Vol. 3, p. 51, pi. II d). Should be classified in this group. As the illustration in Main asella. 
Volume is not good, we are giving another one here (10 a). 
Rh. wiskotti Stfs. (Vol. 3, p. 51). This very rare species, has of late been often successfully bred and is wislcotti. 
now illustrated here (10 d). It is very close to similis. It has no connection at all with culminicola with which 
it was formerly classified. Specimens in which the yellow scales almost completely cover the grey ground 
colour, are named — flavldior Schwing., whilst others in which the yellow scaling is almost entirely absent and flaridior. 
the markings appear very diffuse owing to intensively heavy dark grey dusting have been denominated 
deflavata Schwing. Described from the Glockner region. The larva is not a subterranean one, but lives super- deflavata. 
terrene and is very active. Corti was the first to successfully breed it from the egg. The full grown larva is 
dark olive-green, interspersed with violet-red spots and marbled with velvety black and yellow-grey markings. 
Subdorsally there are rectangular sulphurous yellow spots with a black dot therein. It changes to a slender, 
lively ochreous brown pupa in a frail puparium. According to Corti its entire biology points to its being a close 
relation of lucernea. 
Rh. astuta Corti (10 b). This is somewhat larger than the preceding species, the wide forewings are astuta. 
luteous with buff admixture, the double transverse lines heavily dentate, the middle shade in striations but 
developing into a wide patch between the stigmata. Reniform stigma large and elongate. Subterminal line 
double, sharply marked and heavily dentate. Marginal line reddish yellow. Fringes grey-brown. Hindwings 
somewhat paler than abdomen, clay coloured, faintly darker at margin. Fringes yellowish white with dark 
central line. The $ is somewhat paler and markings are more diffuse. Alexander Mountains. Issky-kul. 
Rh. thapsina Pglr. (Vol. 3, p. 41). We are now giving an illustration of this small species from a typical thapsina. 
specimen in the collection of Corti. 
Rh. simidatrix Hbn.-G. (= nictymera Bsd.) (Vol. 3, p. 51, pi. 12 e). The illustration in Main Volume simulairix. 
would not enable one to recognise this species and we are giving a fresh picture (10 b), as well as of the 
form — dalmata Stgr. (10 b) which -was not illustrated at all before. According to Corti the disputed relation¬ 
ship of simulairix to lucernea can be definitely decided, as both are genuine, separate species. In my opinion 
this is clearly established by the fact that both occur concomitantly, as for instance in the Abruzzi. I have 
ex the collection of Sohn-Retiiel both species from there (Pescocostanzo and Gran Sasso), where they occur 
in forms that are easy to distinguish; simulatrix is more monotonous impure luteous with dull and diffuse 
markings, with similar hindwings, which never have pure white fringes. Vorbrodt also separates the 2 species 
for Switzerland and indicates that simidatrix occurs more frequently in the lowlands of the Rhone valleys 
whilst lucernea is purely alpine. Specimens from Albarracin in Spain, where the species is frequent, exactly 
resemble the specimens from the Abruzzi. Rebel and Zerny have described a form from Albania, named - 
illyrica, which has been placed with lucernea, as they were not certain as to whether a difference in species illyrica. 
existed. According to the description and the illustration I feel more inclined to classify this form to simid¬ 
atrix, next to dalmata. In comparison with same, illyrica is darker, has more distinct and contrasting markings 
on upperside of forewings, rather whiter fringes to hindwings. On underside of hindwings, it differs by the 
dark marginal band which extends to the outer transverse line and merges with same. Nevertheless its position 
is uncertain and its final place will have to wait until the genitalia have been examined. 
Rh. lucernea L. (Vol. 3, p. 51, pi. 11 d). Warren already separated this fine species from the preceding lucernea. 
one. It is never such a luteous yellow, nor has it such diffuse markings. It is either browner or inclined to 
paler bluish to greenish grey; markings are much more definite, especially the subterminal line is more sharply 
dentate; hindwings always with quite pure white fringes and on underside with a wide clearly defined marginal 
band. — cataleuca Bsd. (10 b) illustrates a specimen from Meran. — renigera Steph. (10 c) an english form. — caialeuca. 
dubia Vorbr. a large grey-white form with diffuse marginal band on underside of hindwings. It thereby ap- r ( ^^ ra ' 
proaches simulatrix, but is never of such a clay colour and can always be distinguished by the sharply dentate 
inner and outer subterminal lines, which are characteristic of lucernea. From the Glacier de Trient, the 
Valais. — arguta Corti ined. (10 c) from the Pyrenees, resembles dubia by the more diffuse markings, but is arguta. 
darker; subterminal line is sarcely discernible. - pescona /. n. Drt. (10 c) from the Abruzzi, on the contrary, pescona. 
is a very pale bluish grey, very clearly marked form with unusually dentate subterminal line, central shade 
very apparent but narrow; marginal band of hindwings exceptionally wide and deep black. — imsulicola Trti. insulicola. 
(10 c) is very similar, but generally the specimens are larger and forewings are always much darker. They 
have a much wider central shade and the margin is much darker so that the subterminal line is scarcely visible; 
