FAM. GEOMETRIDZE 215 
rather short, in gf bipectinate to apex, with moderate branches; in Q strongly serrate (almost sub- 
pectinate). Pectus hairy. Hindtibia in cj* not dilated, in both sexes with terminal spurs only. Abdomen 
not crested. Forewing triangular, costa scarcely arched, apex acute, termen oblique, entire, very slightly 
prominent in middle, cell nearly one-half, DC somewhat incurved, SC! from cell, anastomosing with C, 
SC? normal, sometimes anastomosing shortly with SC!, R! short-stalked, M! separate; hindwing with 
costa long, termen rather straight, slightly incurved between H!and R?, at which points it is very 
slightly bulged, tornus moderate, cell somewhat less than one-half, DC? somewhat incurved, C anast- 
omosing with cell at a point or very shortly near base, gradually diverging, SC? stalked, M! connate 
or separate. 
Early stages unknown. 
This genus and Holoterpna are possibly offshoots of Microloxia, through loss of frenulum, short- 
ening of palpus, change of wing-shape, etc. In colour and texture /Toloterpua scarcely differs from 
Dyschlorofsis, and most structural characters agree, though the latter is less robust, with very differently 
shaped hindwing (costa longer, inner margin shorter, a weak sinuosity between R! and R?); it would be 
possible to merge them. 
Type of the genus : Dyschloropsis impararia (Guenée) — Iodis impararia, Guenée. 
Geographical distribution of species. — 5. Russia to W. Mongolia. 
I. D. impararia (Guenée). S. Russia to W. Mongolia. 
Iodis impararía, Guenée, Spec. Gén. Lép. Vol. 9, p. 354 (1858). 
Eucrostis imparata, Herrich-Scháffer, Neu. Schmett. Eur. Vol. 3, p. 27, f. 136 
(1861). 
[ TAalera] impararía, Lederer, Wien. Ent. Monats. Vol. 5, p. 358 (1861). 
Dyschloropsis impararia, Warren, Novit. Zcol. Vol. 2, p. 89 (1895). 
Hipparchus impararia, Gumppenberg, Nova Acta Acad. Leop. d. Naturf. 
Halle, Vol. 64, p. 463 (1895). 
Gcometra impararia, Staudinger, Cat. (ed. 3), p. 261 (190r). 
170. GENUS THALERA, HÜBNER 
Thalera. Hübner, Verz. bek. Schmett, p. 285 (1826?); Lederer, Verh. Zool.-bot. Ver. Wien, Vol. 3, 
D381/723(01853)]* 
Characters. — Face smooth. Palpus quite short, second joint rather strongly rough-scaled, 
third joint in both sexes very small. Tongue present. Antenna in ci bipectinate to apex, the branches 
moderate or long at first, at apex very short; in Q very shortly bipectinate. Pectus hairy. Femora almost 
glabrous. Hindtibia in cf. not dilated, in both sexes with terminal spurs only. Abdomen not crested. 
Forewing with costa shouldered at base, thence straight to near apex, apex squared, termen oblique. 
very faintly sinuous, in /acerataría excised below apex, otherwise merely slightly prominent in middle, 
cell less than one-half, DC? deeply inbent, SC! from cell, anastomosing with C (very exceptionally free), 
SC? normal, very usually anastomosing with SC!, R! short-stalked. R? from much above middle of DC, 
M! approximated to R?; hindwing with apex rounded off, termen excised between R! and R?, toothed 
at these veins and very minutely at the others, tornus moderate, cell less than one-half, DC? deeply 
inbent, C anastomosing shortly with cell, approximately for its second fifth (in lacerataria at a point only), 
then rather rapidly diverging, SC? stalked, sometimes quite shortly 1), R? characteristic, M! approx- 
imated to R?. cx genitalia with uncus tapering to fine point, socii bulbed at base, of equal length with 
2) Lederer says connate; we have observed no such case, 
