10 
ACRONYCTA. By Dr. M. Dratidt. 
suffusa. 
batnana. 
iliensis. 
tridens. 
asignata. 
variegata. 
radoti. 
incretata. 
decyanea. 
obscurior. 
suffusa. 
caliginosa. 
belgica. 
rosea. 
leucocuspis. 
brunnior. 
jezoensis. 
subpurpu¬ 
rea. 
mann the ground colour is the only distinguishing characteristic. In tridens it is reddish grey, in psi bluish 
grey and in cuspis grey-white. However it is very difficult to decide according to a single specimen and 
especially tridens and psi are difficult to classify, cuspis has the most pronounced markings and always dark 
hindwings, whilst in tridens 3 they are pure white and in psi 3 white with darkened veins towards the margin: 
in psi $ they are faintly dusted with grey. Further as Treitschke has laid down, cuspis often has the orbicular 
stigma circumscribed by a closed black ringlet, whilst in the other species it is almost always open towards 
the base. The 3 species are easily distinguishable according to the formation of the valves”. Further in psi the 
dart-shaped mark above the anal angle is nearly always intersected by a small streak which in its course 
extends into the fringes, whilst in tridens these two merge forming more or less one streak; the latter is almost 
always of narrower wing formation. — suffusa Tutt is a very dark aberration; in the type the marginal area is 
especially dark, analogous to the hivirga form and also the basal area is somewhat adumbrated. — subsp. 
batnana n. (1 e) shows very distinct differences when compared with large series of european psi. The general 
impression is darker, especially of hindwings; the outer transverse band is uniformly thick throughout its 
course, whilst in psi it becomes faint between lower and upper median nervures; basal and anal dart-shaped 
marks are double as thick as in name form, the anterior striga is distinctly double. Algeria; Batna (Types in 
the collection of Draudt), Sidi bel Abbes, Messer, Ain Fazza. May to September. — subsp. iliensis n. (1 e) 
specimens from central Asia are very large, both transverse lines are very distinctly double, especially the 
posterior one is distinctly more dentate and strikingly brown instead of being black, further it is not so sharply 
marked but more diffuse. Ili territory, Types in the Pungeler collection in the Berlin Museum. 
A. tridens Schiff. see psi in regard to the differences. Spuler names a form without the anal dart¬ 
shaped mark: - asignata from a specimen from Carlsruhe. — variegata Strd. (= ab. 1 Hmps.) from England 
lias forewings more admixed with white, hindwings of 3 are white, veins tinged with brown towards margin. - 
subsp. radoti Le Cerf from Morocco is a more uniform and darker grey without light patches, only the orbicular 
stigma is lighter and more rounded, both transverse lines contiguous, of uniform width and with blunt scarcely 
perceptible dentations; the wide and long clart-shaped marks intersect the lines, the postmedian one is not 
shaded outwardly with brown. Hindwings scarcely darker than type. We illustrate a good specimen of virga 
Tutt (If). 
A. incretata Hmps. (= increta Btlr. nec Morris, intermedia Warr.) (1 f) is a large species being very 
similar to the two previous and differing from same by the more unicoloured mauve-brown suffused forewing: 
the orbicular stigma is open at toji and obliquely elliptical. A black curved streak extends from same to reniform 
stigma; hindwings of 3 white, veins and margin brownish, of 2 dusted all over with brown and indistinct post- 
median. Japan, Corea, W. China. Specimens from Saghalin are much smaller than those from central Japan. 
The name given by Hampson must be upheld, as it was published in March 1909, whilst Warren’s name was 
not given until May of the same year. 
A. cuspis Hbn. — ab. decyanea Strd. (= ab. 1 Hmps.) forewings dusted with faint brownish without 
bluish tone. — obscurior Strd. (= ab. 2 Hmps.) has forewings almost completely dusted with black-brown. 
Transitions are named: — suffusa Spul. with smoky grey forewings and caliginosa Schultz with smoky brownish 
fore wings. Actually suffusa as well as decyanea are the same as caliginosa , which should have a preference in 
nomenclature, as it is the oldest name; there is no scientific value in such fine differences. Such specimens are 
occasionally met with throughout Germany and Austria. — Specimens from Belgium are generally somewhat 
darker grey, more suffused, submedian with distinct yellowish green longitudinal streaks through and behind 
the cell, prothorax very often not intersected with black longitudinally, although among suffusa forms specimens 
do occur with black prothorax streak. The form, which is paler than the genuine suff usa is characteristic and 
deserves a separate name from the mid-german specimens: belgica /. n. (1 f). — rosea Trti. named from a 
specimen from Sardinia has fore wings with a sort of rose-red sheen, the black dart-shaped marks are boldly 
marked, both stigmata conjoined by a thicker black streak. 
A. leucocuspis Btlr. (T f) should be removed from the cuspis forms and separated as a genuine species, 
differing by the small round white orbicular stigma. — brunnior Strd. (= ab. 1 Hmps.) according to a 3 with 
fore wings suffused with black-brown and hindwings dusted with brown. 
A. jezoensis Mats, somewhat resembles cuspis but differs from same by the completely white hindwings. 
Forewings light grey with black markings; basal streak below the median nervure wide with a small mark 
branching off upwards and 2 downwards; both stigmata obscured, orbicular stigma with dark border outwardly, 
reniform stigma with dark border towards base; postmedian lined with white inwardly, intersected by the 
anal dart-shaped mark; outer margin somewhat darker grey, small black spot marking between the extremities 
of veins, fringes white and checked with white. Hindwings white with black spots along the margin. From 
Hokkaido and S. Saghalin in July and August. 
A. subpurpurea Mats, closely resembles incretata and differs by the deeper red-brown forewings and the 
much wider and longer basal streak; both transverse lines are obscured and only clearly visible above the 
median nervure; the pale grey submarginal edged outwardly with black is relatively close to the margin, 
marginal area behind same somewhat darker. Hindwings pale grey with dark cell spot, postmedian and wider 
marginal adumbration with light fringes. Described from 2 33 from Sapporo, Hokkaido, Japan. 
