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. 



