RHYACIA. Ry Dr. A. Corti and Dr. M. Dratxdt. 
66 
harpes, which curve downwards; the outer characteristics of this group are more acute-angled wings with 
coarser, heavier markings. This would include only renigera Him. with subsp. junebris Stgr. 
forficula. Rh. forficula Ev. (Vol. 3, p. 35). This species does not come under Euxoa, but is closest to renigera. We 
are giving an illustration (9 a) of this somewhat smaller species. It is pale with dense irrorations, indistinct 
markings and can be differentiated by a wide, dark, sharply defined outer margin on underside, which renigera 
has not got. 
hadjina. Rh. hadjina Stgr. (Vol. 3, p. 55, pi. 15 i). This species should also be placed here. We are giving a 
better illustration (9 a), the illustration in Main Volume being a poor copy. We are also giving a good illus- 
zeiiuna. tration of the pale form: — zeitima Stgr. (9a). In regard to this “species”, compare what was said under 
renigera. 
tatens. Rh. latens Him. (Vol. 3, p. 52, pi. 11 f). The illustration was not good, we are giving a fresh picture 
iliuminaict. (9a). The foi’m from Italy is not identical: — illuminata Trti. (= apennina Sohn-Refhel) from the Majella and 
Monti Sibillini, is a much paler, whitish grey form which is generally more distinctly marked and thus so 
similar to certain specimens of grisescens albescens, that same can only be differentiated by the somewhat 
longer pectinated antennae and rather more arched frons. Generally however the ground colour is slightly 
obscura. more luteous and the black irrorations coarser. — ab. obscura Schiving. is a much darker grey-black form 
from Carinthia. 
pallidi- Rh. pallidifrons Hmps. (Vol. 3, p. 28, pi. 6 b). According to Corti, this should be classified next to 
frons. Jatens and according to its appearance it seems to have natural affinity to same. 
electra. Rh. electra Stgr. (Vol. 3, p. 55, pi. 13 d) woidcl also come into this group, having much similarity to 
latens, as well as grisescens. 
grisescens. Rh. grisescens F . (Vol. 3, p. 29, pi. 6 g). The illustration in Main Volume is good, that of the $ represents 
fasciata. an aberrative form with dark central band, which Vorbrodt has named — fasciata; it was described from 
defasciata. Pontresina, but is found occasionally over the whole area of distribution. — defasciata Wendtland denotes spe¬ 
cimens without the dark central band; described from the Rhineland, but occurring everywhere. Occasionally 
melanic specimens occur, which besides the black shading, have a violet hue. Such a specimen ex the collection 
of Corti is n'ow illustrated (9 a). Vorbrodt mentions a similar specimen from Davos, which was in the first 
albescens, instance held to be a melanic aberration of simulatrix. — albescens Sohn-Rethel (9 b) is a form with whitish, 
often silvery whitish ground colour, that occasionally has a yellowish tinge, almost devoid of irrorations, the 
dark markings being delicate but clear, the dark shadings reduced; also the hindwings are purer white with 
contrasting dark marginal band. The form is fairly common in the Abruzzi territory in Italy, but is also 
mentioned as occurring in Albania, Bosnia, etc., although there it seems to have a more yellowish grey tone. 
nivescens. The Abruzzi specimens are very like — nivescens Rbl. described from South Russia (Govt. Woronesh). Body 
and wings pure white, the latter with blackish grey markings, only a dark wedge-shaped mark of the middle 
shade is retained, between the stigmata. These are white with dark surrounds. Hindwings white faintly 
tliicinscha- brownish grey at apex and margin. — thianschanica Stgr. (9 b) is now illustrated from a typical specimen.— 
nica. g r i ses ce n s should not be classified under Euxoa, where Hampson had placed it, but it should be grouped quite 
close to latens. 
cognita. Rh. eogfiita Stgr. (Vol. 3, p. 28, pi. 6 b). According to Corti this is also neither a Euxoa nor a Feltia 
and is best classified here. 
caradrinoi- Rh. caradrinoides Stgr. (Vol. 3, p. 55, pi. 13 e). The old illustration was a copy and not very recognisable. 
des. \\ r e are giving a fresh picture here (9 b). 
fugax. Rh. fugax Tr. (Vol. 3, p. 55, pi. 13 c). This is the oldest representative of this difficult group of very 
similar species. The illustration in Main Volume was not good and we are giving a fresh one (9 c). 
ala. Rh. ala Stgr. (Vol. 3, p. 55). We are illustrating this species (9 b). It is very like fugax, but differs 
in the first instance by the whiter hindwings which have no heavy discal lunule. Hampson even considered 
same to be a form of fugax, but it is certainly a genuine species, that is apparently found throughout western 
Asia. 
photophila. Rh. photophila Gn. (Vol. 3, p. 55, pi. 13 c). The old illustration was unsatisfactory and we are giving 
a fresh one (9 d). The species is distributed over North Africa from Morocco to Algeria and in places it is 
common. It sometimes occurs in such numbers as to be a regular nuisance round the lamps. From further 
east, Egypt and Syria it has not yet been announced. — ignipeta Obth. seems to have been denominated from 
a specimen, to which incorrect (pectinated) antennae have been artificially applied. Hampson considered plioto- 
phila and sollers to be synonymous, which is possibly correct; the latter species seems however to differ, 
but it may only be the asiatic form. 
