FAM. GEOMETRIDZE 195 
distance, sometimes with point-anastomosis, divergence usually rather gradual, SC? stalked, R? from very 
near Ri, M! usually widely separate (short-stalked in azegricornis) (Pl. 4, Fig. 14). c genitalia (Dacoti) 
with uncus hooded, gnathos terminating in a long blunt arm, harpe with finely spined clasper, penis 
pestillate, sharply angulated in the centre, terminating in two dentate arms. Suggests more resemblance 
to Pseudoterpna than to any other genus investigated, but the two genera — so far as is yet known — have 
little else in common. 
LaRva. — Probably of the stiff, green, twig-like type, with two anterior projections from prothorax 
above head. (See Fawcett, Trans. Zool. Soc. Lond. Vol. 17, t. 8, £. 6, 7, as « Euchloris devocata », but almost 
certainly an Onmphax.) 
Pura. — Brown, wing-cases paler, veined with brown, segment-incisions distinct, spiracular spots 
large, black (Fawcett, loc. cit. fig. 8). 
We have not seen Guenée's type (locality unknown), but from his diagnosis, and information 
kindly given by M. Oberthür, it is certainly identical with, or very close to rubriplaga, Warren, from 
which (with its nearest relatives) we have diagnosed the genus. Robuster than Radinomphax, C of hind- 
wing not anastomosing; palpus usually still minuter, abdomen commonly with small crests, forewing 
usually more ample. 
Type of the genus : Onmfhax plantaria, Guenée (1858). 
Geographical distribution of species. — /Ethiopian. 
SECTION Í. — Antenna in gf not bipectinate. 
I. O. flantaria, Guenée. S. and E. Africa. 
Omphax plantaria, Guenée, Spec. Gén. Lép. Vol. 9, p. 368 (1858). 
? Agraptochlora rubriplaga, Warren, Novit. Zool. Vol. 4, p. 33 (1897). 
2. O. subaspersa (Warren). S. to E. Africa. 
Agraftochlora subaspersa, Warren, Novit. Zool. Vol. 1, p. 390 (1894). 
3. O. marginata (Warren). S. Africa. 
Agraptochlora marginata, Warren, Novit. Zool Vol. r, p. 390 (1894). 
? Euchlovis devocata, Fawcett, Trans. Zool. Soc. Lond. Vol. 17, p. 184, t. 8, 
f. 5-8 (1903) (nec Walker). 
4. O. modesta (Warren). S. Africa. 
Agraptochlora modesta, Warren, Novit. Zool. Vol. 4, p- 32 (1897). 
5. O. aficata (Warren). German E. Africa. 
Pycenodontia apicata, Narren, Novit. Zool. Vol. 8, p. 206 (19or). 
6. O. bacoti, nov. sp. 1), Prout. S. Africa. 
SECTION II. — Antenna in cg shortly bipectinate. 
7. O. vicinitaria (Wallengren) (huj. gen. ?). S. Africa. 
[odis vicinitaría, Wallengren, Wien. Ent. Monatschr. Vol. 7, p. 150 (1863). 
1) Omphax bacoti, nov. sp. — c3 Q, 34 to 30 mm. Face red, mixed with ochreous below. Palpus ochreous, mixed with red. Legs 
ochreous, red on upper side except hindtibia and tarsus. Head green, narrowly ochreous (red- marked) between the antennz. Antenna quite short, thick, 
lamellate, scaled area ochreous mixed with red. Thorax green above, whitish beneath. Abdomen whitish ; crests wanting. Wings long and narrow, formed 
almost like A Ztadezionphtax (tvincfa, but more robust. Forewing green nearly as in that species, but rougher, costal edge narrowly pale ochreous; fringe 
cream-colour, tipped with pink. Hindwing white, sometimes strongly tinged with green in inner-marginal half ; fringe white, not tipped with pink except 
towards tornus. Underside whitisb, tinged with ochreous, especially at costa of both wings; the greater part of forewing (except termen and inner margin) 
sometimes with a slight smoky suffusion. Durban (E. A. Bacot). Type and two cotypes (all c) in coll. L. B. Prout. Pretoria, rogth December, :910 (D' Breyer), 
a Q; Transvaal, (C. H. Pead), a c; both in coll. Brit. Mus. Parberton, Transvaal,26th December, 19gro, a Q in coll. A. J. T. Janse. Two c from 
S. Africa in coll. Oxford Mus. Structure quite as in RhadinompAax, excepting the robust build and the non-anastomosis of €. of the hindwing. It probably 
forms at least a separate section of Omg£azx, differing in shape and lack of crests; perhaps even a genus. In the type specimen 5C! of left forewing 
approaches successively C and 5C? without anastomosinv; on the right wing it anastomoses at a point with C. In most examples it anastomoses slightly or 
strongly with both C and SC?. 
