FAM. GEOMETRIDZE 169 
Characters. — Face smooth. Palpus moderate to long, second joint shortly scaled, reaching 
beyond frons, third joint smooth, in Cf quite moderate, in Q elongate. Tongue developed. Antenna 
in gf ciliated (typically dentate-fasciculate), in Q minutely ciliated. Pectus somewhat hairy. Femora 
glabrous (except hindfemur of c). Hindtibia in gf long, with strong sheath and hair-pencil, no appre- 
ciably process, median spurs wanting, terminals not long, hindtarsus 
abbreviated (Fig. 15); hindtibia in Q with all spurs. Abdomen with 
small or moderate crests. Frenulum in C* present, arising from before 
IBIG2 15 
basal expansion, in Q wanting. Forewing with costa somewhat arched, 
apex moderate, termen smooth, slightly curved. oblique, cell less than 
one-half, SC! from cell, usually iree, sometimes anastomosing with C, 
SC? normal, R! usually stalked, R? from above middle of cell, M! short- 
stalked, connate or closely approximated; hindwing with apex moderate, 
termen usually tailed or angled at R? (rarely only slightly bent), tornus 
pronounced, inner margin rather long, cell short, DC incurved, becoming 
rather oblique, C anastomosing with cell at a point near base, then rapidly 
diverging, SC? stalked, R? from considerably above middle of DC, 
M! short-stalked. cf genitalia : uncus pointed, with slender socii of equal -IRdleg 
ol HemitAea aestivaría, Hübner, g. 
length, gnathos almost atrophied, harpe with finely spined clasper, penis 
pestillate, short coremata present. 
Ecc. — Short oval, much flattened and with a large depression on upper side, slightly flattened 
at one end; surface shagreened; colour pale green (cf. Ent. Rec. Vol. 14, p. 246; Vol. 19, t. 9, f. 1). 
Lanva. — Thin and firm (twig-like), head bifid, prothorax with bifid anterior projection over 
head, body with decided lateral flange. In first instar with a number of club-shaped hairs and posteriorly 
on the dorsum of abdominal segments r-5 a T-shaped hair, resembling that upon the dorsal area of 
Hifparchus papiltonaria ; no actual covering as in the Comibaena-group, but the habit prevalent of spinning 
threads about the body, to which becomes attached foreign matter such as dust and dirt. In later stadia 
the hairs become progressively less specialized, the « balloon-shaped » process which correponds to the 
special organ of Comübaena and Euchloris (whereby they attach their clothing) not very conspicuous 
(Burrows, Ent. Rec. Vol. 19, p. 278). 
Pura. — Rather slender, light brown, with dark dorsal line; cremaster with eight hooks, four 
fairly uniform at extremity and two pairs more dorsal and lateral a little before extremity. Loosely spun 
among leaves. 
This genus and the following, though distinct in several characters in their typical forms, are so 
connected by intergrades that it is difficult to maintain them on a rigid classificatory system. AII the 
strongly tailed or angled species (with the possible exception of sub/lavida, of which we have not access to 
an undamaged specimen) have also the crested abdomen, and this combination of characters furnishes 
the typical Hemithea. But a few with appreciably angled hindwing (CAlorissa pretiosaria, at least) have no 
sign of crests, while a few African forms with rounded hindwing (e. g. dorsicristata) are more or less well 
crested. The type species of CZlorissa has itself frequently two minute crests, and we have observed 
no instance, even in the African species, where the number is more than two. As there is no true 
(angled and fully crested) species of Hemilhea known in Aífrica it seems quite clear that dorsicristata 
is a development of CZ/orissa and we are compelled here to consider the wing-form as equally important 
with the cresting. 
Type of the genus : /7Temilhea aestivaria (Hübner) — P/Aalaena Geometra aestivaria, Hübner (1829). 
