NEW SOUTH AFRICAN GEOMETRIDAE. 
By Louis B. Prout, F.E.S. 
The species and forms here described are almost entirely from the rich 
material submitted to me for determination by Mr. C. J. Swierstra, of the 
Transvaal Museum, and Mr. A. J. T. Janse, of Pretoria. I am greatly 
indebted both to the Museum and to Mr. Janse for the presentation of 
duplicates of many of the species. 
There is, up to the present time, absolutely no systematic work dealing 
with the Geometrid fauna of the Aethiopian Region , and the generic location 
of the species, pending systematic revision, is to a large extent merely 
provisional ; but I believe sufficient clue as to the characters intended to 
be conveyed by the names employed will be found in my own writings, or 
in those of Mr. W. Warren, published in Novitates Zoologicae. The Hemi- 
theinae have recently been revised by myself ( Genera Insectorum , fasc. 129). 
SUBFAM. HEMITHEINAE. 
Prasinocyma chlor opr o soya, n. sp. 
$, 32 mm. Face bright green. Palpus with second joint extending 
considerably beyond frons, third joint fully as long as second ; ochreous 
brown above, paler beneath. Vertex between antennae white, head other- 
wise green. Antenna white at base, becoming ochreous brown to reddish. 
Thorax green above, white mixed with green beneath. Foreleg red above ; 
midtibia tinged with red ; hindtibia paler. Abdomen green dorsally, 
more narrowly so towards anus, white ventrally ; no dorsal pattern. 
Wings ample ; forewing with SC 1 free, both wings with M 1 connate ; 
bright green, slightly darker and more bluish than in vermicularia, without 
definite strigulation, the colour composed of dense dark green irroration 
on whitish-green ground. Forewing with costal edge narrowly ochreous 
at base, becoming more red-brownish ; a small white spot in middle of 
inner margin ; fringe con color ous, whitish at extremities. Hindwing with 
bend in termen at R 3 just appreciable, but very slight ; discocellulars 
slightly darkened green, suggesting a weak, elongate cell-mark. Underside 
paler green, unmarked, costal edge of forewing narrowly ochreous to 
brownish. 
Johannesburg, 25th April, 1902 (A. Ross). Type in Transvaal Museum. 
Distinguished by the bright green face, white inner-marginal spot, etc. 
Guenee describes his vermicularia as having the face green, but with the 
summit ferruginous. The species which passes for vermicularia in collec- 
tions usually has the face reddish-brown more or less mixed with green, 
though I have seen one or two answering his description ; in any case the 
new species differs further in absence of vermiculation and presence of 
white inner-marginal spot. Probably differens Warr. (Novit. Zool., ix, 
194 
