ILLA; MAUNA. By L. B. Prout. 
125 
To p. 41, Sy 71 collesis: 
S. tiviae Prout. Expanse 26 nini. Antennal pectinations of the rudimentary (shorter than diameter liriac. 
of shaft). Foremng anteriorly more rounded than in ulia (41, as bellista), postmedian line less whitish, not 
appreciably dark-edged proximally (therefore less distinct), curved, approximately ])arallel with termen. 
Recently described on a from Ndola, N. Rhodesia; a second example subsequently sent from Elisabethville. 
Should be jdaced next to idia, but the antenna and wing-shape show that it is not merely a subsiiecies. 
To p. 43, H e m i s t 0 I a : 
H. semialbida Protii (2 g, as semialbata), accidentally omitted from our text, is well recognizable semialbida. 
from oiir figure, though the apex of the forewing is shown somewhat too acute. Expanse 37—40 mm. 
From tricohrifrons, the only other known African Hemisiola which equals (or surpasses) it in size, it is very 
different in its less broad wings, opaque scaling, absence of strigulation, white hindwing, etc. Only $$ yet 
known. Cape Colony: Griqualand East (the type) and Port Elizabeth; Orange Free State; Sepani. 
5. Subfamily: Geometrinae. 
This immense subfamily, embracing almost all the CTeometridae in which the 2nd radial of the hind¬ 
wing is wanting or obsolescent, is moderately well represented in Africa, although ■— as has been mentioned 
in our Introduction, p. 1 —-a number of the most characteristic groups of the other regions, including all the 
excej)tionally large forms, not to mention the Ourajyferyx of the Palaearctio and Indo-Malayan fauna and many 
others, are entirely wanting. Very characteristic is the dominance here of the nearly cosmopolitan genus 
Se7niothisa, which in Africa is not only very strong in species but also in the abundance of several individual 
species, and of the beautiful Zarnarada, elsewhere represented only by a few Indo-Malayan species. Some 
indigenous developments will also arrest attention, as for instance the robust and singularly shaped Theiiopa 
group, the relatively large,♦slenderly built Melinoessa and — especially in South Africa •— a grou]3 typified 
by the genus Drepanogynis Guen., with a special venational development in the The general affinities are 
with the Indo-Australian fauna, as evidenced by the Neocleora section of Gleora, by Luxiai'ia, Lo7nograplia. 
section Heterostega7ie, Hyposidxa (sens, lat.) and numeroi;s other elements. The Psilocerea group seems to 
bear more resemblance to some Neotropical genera, but the phylogeny is not yet sufficiently rinderstood to 
allow of dogmatism. Syrrliodia (sens, lat.), which includes one or two African “pests”, is common also in South 
America and the Indo-Australian Region. 
1. Genus: Ilia Warr. 
Tongue present. Head, palpus (except the 3rd joint), thorax and femory shaggy-haired. Antenna of 
G unilamellate. Hindtibia with hair-pencil; all spurs present. Forewing with cell rather long, a ridge at cell¬ 
fold beneath, from which a fringe of hairs overhangs the median vein; costal free, 2nd subcostal from cell, 
anastomosing with 2nd and with stalk of 3rd—4th. Hindwing with costal approximated to subcostal for some 
distance before middle of cell, 2nd sribcostal not stalked. Unknown to me, but I have adapted the characters 
from Janse. Only the type species known. 
I. nefanda Warr. (12 h). Very robust, recalling a Noctuid or Notodontid. Probably related to Matina nefandu. 
Section B, but differing in the subcostal venation of the forewing. Cape Town, only two specimens knoAvn, 
both cJ; the type was bred, but unfortunately no information is published regarding the larva. 
2. Genus: Manila Walk. 
Most characters as given under Ilia. Vestiture probably somewhat less shaggy. Face somewhat pro¬ 
tuberant. Forewing beneath with the long hair (when developed) more longitudinal, covering the cell; 2nd sub¬ 
costal generally anastomosing or connected with 3rd-—-dth, but quite free from the 1st. The typical section 
shows further distinctions, but section B comes nearer to Ilia. 
A. Antenna of ^ pectinate to near apex, with short branches. Wings 
narrow. 
