80 
RHYACIA. By Dr. A. Corti and Dr. M. Draudt. 
stigmatula. 
xanthogra¬ 
pha. 
budensis. 
xanihosta- 
xis. 
margineor- 
nata. 
astixis. 
rufa. 
obscura. 
nigra. 
funerea. 
almohada. 
lepida. 
pulverea. 
triscriata. 
herzi. 
coturnicola. 
modcsta. 
argillacea. 
hcrzioides. 
Rh. rhomboidea Esp. (Vol. 3, p. 45, pi. 10 b). — ab. stigmatula Hartig. This denotes specimens without 
the dark patch between the stigmata and in front of the orbicular stigma. Described from Terlan, but also 
found occasionally elsewhere, although it is a rare aberration. 
Rh. umbrosa Him. (Vol. 3, p. 45, pi. 10 c). 
Rh. xanthographa Schiff. (Vol. 3, p. 46, pi. 10 d). A most variable species. — budensis Err. The illus¬ 
tration in Main Volume was not very satisfactory. We are giving a better illustration here (12 b). It is a 
very large sandy grey form with distinct and delicate markings. The following further aberrations are described: 
- xanthostaxis Dhl. Ground colour dark and unicolourous. Both stigmata with yellow centres. Subterminal 
line is also pale yellow. — margineornata DM. describes similar specimens, w'hich however have the marginal 
area pale yellow. — astixis DM. denotes specimens in which the stigmata have no circumscriptions. — rufa 
Tutt are pronouncedly reddish specimens. — obscura Tutt, — nigra Tuft and — funerea Gauckler cover all 
shades of dark specimens and with the exception of the last named form, w'hich denotes the extreme blue-black 
colouration, appear superfluous. — almohada Wgnr. (12 b). This is a pale reddish brown form. The space 
between the faintly marked stigmata is only slightly darker. Of the transverse lines only the posterior one 
is retained as a row of dots. Behind same is the distinct blackish submarginal band. Hindwings pure white 
with faint subterminal band which is separated from the similarly faint margin by a pale zone. This form 
occurs more or less as a race in Tunis. 
Rh. lepida Costni. Whether this may claim specific rank, or whether it is merely a form of the variable 
xanthographa, has not yet been definitely ascertained. It is described from 2 $$ and 1 <$. Forewings dark 
red-brown, marked as the previous species, but the transverse lines are more simple, about as in umbrosa. 
The stigmata are quite extinct, with delicate yellow circumscriptions. There is a yellow streak on the mediana 
conjoining them as in rectangula. Only the reniform stigma is darker in its lower lobe. Claviform stigma 
is absent. Hindwings impure wdiite with darker border and discal spot. From the Apennines of Modena, Sestola. 
Rh. pulverea Hmps. The position of this species is not yet definitely certain. Corti places it with 
a “?” to xanthographa. Hampson placed it widely separated from this ( Agrotis sens. Hmps.) in the Genus: 
Lycophotia, but the differences between these two “Genera” are so insignificant, that I am placing same in 
the Rhyacia. It has the appearance of a grey palaestinensis and does not differ in any way in the markings 
from xanthographa. Hindwings are white, veins and marginal band dusky, darker in the $, with white fringes. 
Wing expanse: 32—36 mm. Described from Cyprus. 
Rh. poliogramma Hmps. (Vol. 3, p. 47, pi. 6 g). 
Rh. putris L. (Vol. 3, p. 49, pi. 10 k). — triseriata Moore the much darker form known from Japan 
and N. India, has now also been discovered in Szechuan (Omihsien, Kwanhsien). We are illustrating a typical 
specimen from there (12 b). 
Rh. herzi Christ. (12 b). In the Main Volume this was united with the following species coturnicola, 
but this was incorrect; herzi is a somewhat smaller species and the ground colour inclines more towards an 
olive shade, the stigmata are somewhat larger, the orbicular stigma is quite round, the middle shade is more 
in the form of striations, the postmedian is not dissolved into dots. Its area of distribution is further west¬ 
wards, in Mongolia (Uliassutai) and Transbaikalia (Vilui). 
Rh. coturnicola Graes. (Vol. 3, p. 37, pi. 12 b) (101). As mentioned in the preceding species, this is 
somewhat larger, otherwise it is very similar. The colouration is redder, the stigmata inclined to be smaller, 
the orbicular stigma is not so regularly round, the central shade is wider merging with the dark area at inner 
margin. The postmedian is supplemented by dots on the veins. Claviform stigma is almost indistinguishable. 
From the Amur. 
Rh. modesta Stgr. (Vol. 3, p. 50, pi. 11 c). This smaller species is best classified here. The illustration 
in Main Volume is not good. We are giving another illustration of the species here (12 b). It resembles rubi, 
but is smaller and with more elongate wings. 
Rh. argillacea Alph. (Vol. 3, p. 58, pi. 13 h). This also shoidd be classified here. The Subgenus Peris- 
sandria, which was based on a $ with stunted wings, is superfluous. The species is variable, but rarely as 
pale as our illustration. We are therefore giving a better illustration (12 b) of the usual form, which in the 
Main Volume is enumerated as albistigma (Vol. 3. pi. 13 h). 
Rh. poliocliroa Hmps. (Vol. 3, p. 58). 
Rh. herzioides Corti ined. (12 c). This is a small species, belonging in the plecta group, resembling the 
form: mucidata Dhl. Pale rufous with widely diffused pale yellowish costal streak extending over cell and base. 
Of other markings there is only a black dot at base of costa, a dot on postmedian nervure and blackish marginal 
triangles. Fringes pale yellow. Hindwings thinly scaled, very pale grey. Base of fringes yellowish. Ta-tsien-lu. 
Type in the collection of Corti. 
