428 XOVITATEe ZOOLOGICAB XXIV. 1 017. NEW AFRICAN GEOMETRIDAE. By LOUIS B. PROUT, F.E.S. SuBFAM. OENOCHROMINAE. 1. Cartaletis libyssa natalensis subsp. nov. Abdomen with the white spots smaller than in I. libyssa, I. montcironis, and I. etheliiirla. the black area which separates the dorsal and lateral rows broader than their diameter. Ground-colour slightly deeper than in I. libyssa. Forewing with the black border on an average broader, its proximal edge very gently and ahnost evenly curved, or sometimes slightly bent about M' (never with the strong bend in front of M' which is so frequent in the other forms named) ; the contained white spot.^ generally somewhat smaller, the last one (behind M') nearly always wanting (if present, quite rudimentary).* Hind-wing with the black border generally widened. C4riqualand to Pondoland. Type S. Durban (G. F. Leigh), in coll. Tring JIuseum. This form has stood in the British Museum collection as libyssa and has consequently been mentioned under that name by Rogers, Trans. Ent. Soc. Lond. 1908, p. 522, as " the well-known south-eastern species." Hopflcr, how-ever, described and figured the species from Mozambique, and his form inhabits German East Africa, Zanzibar, etc., differing only frcm the form monieironis Druce in its deeper colour. The new form similarlj' differs only from concolor Warr. in its deeper colour, and it is not impossible that we are dealing with two species — libyssa = monieironis = ethelinda and concolor = natalensis. Warren labelled this Natal form rubra, but I have departed from my usual practice of adopting an available MS. name, inasmuch as the reddest race in the collective species (or group) is ethelinda Kirb}% from Nyassaland. SuBFAM. HEMITHEINAE. 2. Prasinocyma tranquilla spec. nov. cJ, 22 mm. ; 2, 26 mm. Face and palpus hght red-brown ; palpus in o scarcely longer than diameter of eye, in ? fully one-and-a-half times as long, with third joint Uttle elongate. Vertex narrow!}' white ; occiput green. Thorax above green, beneath whitish ; abdomen mostly whitish. Hindtibia in (J not dilated. Forewing with SC anastomosing with C ; smooth, uniform malachite green, without white irroration or strigulation ; costal edge narrowly pale cchreous ; cell-dot very faintly indicated in darker green ; fringe green proximally, white distally. Hindwing with termen smooth, rounded, tornus not produced ; concolorous with forewing, at base of costa more whitish ; cell-dot as on fore-wing or scarcely indicated ; fringe as on forewing. • It is curious that Hopffer's figure (of libyssa name-type) does not show this spot, but it is mentioned in his description ; it is generally well developed in this and the nearly allied races.