rafidain. 
columbina. 
fuliginosa. 
peterseni. 
rupicola. 
eremica. 
caerulescens. 
pontica. 
pseudolatens. 
cervantes. 
sellers. 
24s RHYACIA. By Dr. M. Dratjdt. 
oblique margin. Forewings pale bluish grey, basal area, stigmata and the space between the barely discernible 
postmedian and subterminal lines slightly paler still, almost whitish. Subbasal and anterior transverse line 
are indicated by heavy black striated spots, the cell space between the stigmata is deep black, as also is a costal 
streak above the reniform stigma. Marginal area slightly darker. Hindwings pale grey with white fringes. 
Described from Zeitun, but also occurring in the Elburz mountains in N. Persia. 
Rh. rafidain Bours. seems to belong to the insignata group, but as hitherto no <$ has been captured, the 
classification is still somewhat uncertain. Forewings grey, admixed with rosy brown. The black-brown ante- 
median is clear, claviform stigma absent. Orbicular stigma small and indistinct, the cell space between it and 
the insignificant reniform stigma is rose-brown. The posterior transverse line is rather less distinct than the 
anterior line and behind it subapically on costa there is a large dark brown streak. Subterminal line is barely 
visible. There are black dots on the nerves before the fringes, which are the same colour as the wings. Hind- 
wings impure white with wide dark marginal band. Wing expanse: 32 mm. Iraq, Bagdad. 
Rh. insignata Led. (Vol. 3, p. 54, pi. 13 b; Suppl. Vol. 3, p. 64). — columbina Drt. (25 b) is a very pale 
blue-grey form with faint violet hue, slightly darkened median area and very large stigmata. The latter are 
not paler in centres and are delicately but distinctly circumscribed with yellow-white. All markings are very 
delicate. Hindwings pure white without marginal line. Anatolia (Sultan-Dagh) and also from around Lake 
Van. - fuliginosa Drt. (25 b) on the contrary is heavily suffused with grey-black, the veins standing out pro¬ 
minently white. A very large form from Van. 
Rh. peterseni Krul. ( = eversmanni Pet.) was accidentally omitted. Superficially it closely resembles 
collina Bsd. (Vol. 3, p. 47, pi. 12 b; Suppl. Vol. 3, p. 65), but the genitalia are differently constructed. It is 
easily differentiable from collina by the dark intertilling of the space between the posterior transverse stripe 
and the subterminal line. In colouration this species most resembles dark forms of / estiva, that approach the 
/. thulei. Esthland, Finland, Leningrad, Urals. 
Rh. rupicola Trti. (pi. 24 i) is classified by its author next to senescens and quadrangula on account of 
the pectinated antennae of the <$. Superficially it would seem to have a closer resemblance to renigera and 
related forms. Meanwhile we place it after jordani, which also has pectinated antennae. Ground colour yellowish 
white with faint roseate hue, markings diffuse olive-brown, sometimes almost obsolescent; at margin there 
are black streaks in the interstices between the veins. Hindwings whitish, tinged with rose towards margin 
and with olive post-median. The d antennae are bipectinated, pectinations becoming shorter and finer towards 
the tip. Cyrenaica in October, November. 
Rh. devota Chr. (Vol. 3, p. 55, pi. 15 i; Suppl. Vol. 3, p. 65). — eremica Amsel is much more yellowish 
and with fainter markings. On underside it is not darker towards margin. Wing contour is wider and it is of 
stouter build. Genitalia as in devota and not as renigera. Palestine (Georgian Monastery) in March. 
Rh. caerulescens Wgnr. (Suppl. Vol. 3, p. 65) has no connection with renigera Hbn. (Vol. 3, p. 55, pi. 13 e; 
Suppl. Vol. 3, p. 65) and is probably a form of hadjina Stgr. (Vol. 3, p. 55, pi. 15 i; Suppl. Vol. 3, p. 66) unless 
it is a separate species. It also occurs in N. Persia (Elburz mountains) and the specimens from there, are a very 
nice grey-blue shade with pale orange-yellow stigmata. 
Rh. latens Hbn. (Vol. 3, p. 52, pi. 11 f; Suppl. Vol. 3, p. 66). — pontica. Drt. (pi. 25 e) is somewhat smaller 
and of more graceful build, paler earthen grey with simplified markings. There is no central shade and sub¬ 
terminal line only very faint. Stigmata barely discernible. Hindwings paler, whitish. From Anatolia and 
N. Persia. 
Rh. pseudolatens Schwing. (26 d) is an intermediate between grisescens and latens. The yellowish grey 
wider forewings more closely resemble grisescens and especially the form thianshanica, whilst the uniformly 
grey-brown hindwings are more like those of latens in that they are not paler at base and have no arched stripe 
either on upper or undersides. Whether this is a genuine species or not, cannot as yet be decided. The character¬ 
istic yellow-grey colour, the wing contour and its isolated occurrence — grisescens and latens have not yet been 
found in Africa — suffice to separate it. It occurs at Tachdirt in the High Atlas (Morocco) at the end of July 
at an altitude of 2300—3100 m. 
Rh. grisescens F. (Vol. 3, p. 29, pi. 6g; Suppl. Vol. 3, p. 66). cervantes Reisser (pi. 25 k) denotes a 
robust, wide winged race with ochreous ground colour, which is sometimes somewhat shaded by black speckling. 
All wings silkily glossy, the black markings distinct and well developed, also the central shade is clear and wide. 
Fringes with ochreous yellow base line. Hindwings pale yellowish grey with dark veins, indications of a post¬ 
median and a faintly dusky margin. This form, which emanates from Spain, despite its different appearance, 
is conspecific with grisescens as the genitalia are identical. Sierra de Gredos, in July. 
Rh. sellers Stgr. (Vol. 3, p. 55, pi. 13 d; Suppl. Vol. 3, p. 67). It wms already indicated in this Supple¬ 
ment that this group of forms presents difficulties; sollers was described from Persia and whether the forms 
described in Main Volume belong to it, is still doubtful. It is certain that the specimens from Anatolia and the 
Taurus (Marash) supposed to be sollers are n o t- this species, but probably a separate species. Boursin, avIio 
just at. the moment is devoting himself to this group, writes to me preliminarily that he has had an opportunity 
to examine the original types of sollers Chr. of Statjdinger which the latter had received direct from Christoph. 
