62 D. S. FLETCHER 



structurally from dargei in the male genitalia in the slender slightly scobinate, 

 digitate extension of the sacculus, in the irregular shape of the apex of the aedeagus 

 and in the shape of the cornuti on the vesica. In the female genitalia the form of 

 the sterigma, the absence of a colliculum and the development of the dilate, mem- 

 branous additional sac are diagnostic. 



Distribution (Map 4). Congo (Leopoldville) ; W. Uganda. 



Holotype <$. [Congo (Leopoldville)] ; W. Kivu, Nr. Masisi, Upper Lowa Valley, 

 5000-6000 ft., forest and long grass, ii.1924, wet season (T. A. Barns), genitalia 

 slide Geometridae No. 2297. 



Paratypes. [Congo (Leopoldville)] : data as holotype, 1 $ ; Nr. Walikili, 3000- 

 4000 ft., forest, ii.1924, wet season (T. A. Barns), 2 $ all in British Museum (Natural 

 History) ; Sankuru, Katako-Kombe, 27.xii.1951 (Dr. M. Fontaine), 1 <$ ; ibid., 

 23-24.vii.1952, 2 <$ ; ibid., 10. ix. 1952, 1 <$ ; ibid., 15. xi. 1952, 1 $ ; ibid., n.i.1953, 

 1 $ ; Lusambo, 24.vii.1949 (Dr. M. Fontaine), 1 <£ ; Luluabourg, 20.viii.1955 (Ch. 

 Seydel), 1 $ ; Uele, Paulis, 18.ii.1956 (Dr. M. Fontaine), 1 <$ ; ibid., 12.iv.1956, 2 cj, 

 1 $ ; ibid., 3. v. 1956, 1 <$ ; Boyenga, 1930 (Delpierre), 1 J ; Fomlioko, 20.ii.1921 

 (Verlaine), 1 <$ ; Boende, i.iv.1940 (R. P. Hulstaert), 1 J, all in Musee Royal de 

 l'Afrique Centrale. Uganda : Bwamba, v. 1956 (R. Carcasson), 1^,1$. 



Cleora thyris sp. n. 



(Text-figs. 81-83 ; PI- 8, figs. 274-280 ; Map 4) 



<J. First abdominal segment white, remainder of vestiture white, irrorate with bister. Wings 

 white, irrorate and patterned with bister ; terminal interneural spots, medial and postmedial 

 fasciae on each wing, discal streak and antemedial fascia on fore wing sharply marked and a 

 shade darker ; cubital veins and other veins distad of postmedial fasciae streaked with warm 

 buff (PL 8, fig. 274). Underside tilleul buff, suffused and patterned with bister (PI. 8, fig. 275). 



o*. Genitalia (Text-figs. 81, 82). Gnathus with semi-circular scobinate medial plate, equal 

 in diameter to two-fifths width of cucullus, the scobination extending posteriorly along sub- 

 scaphium ; process from sacculus spatulate and incurved, outer surface of apex and inner surface 

 of base pustulate and setose ; vesica with two cornuti, one of even width, serrate at one side and 

 scobinate on ventral and dorsal surfaces apically, five-eighths as long as aedeagus, the other 

 tapered sharply, scobinate at one side apically and one-fourth as long as aedeagus. 



$. Vestiture white, very lightly irrorate with bister, abdominal segments, except first, with a 

 pair of bister spots medio-posteriorly. Wings white, patterned as in male, but irroration very 

 light and sparse ; buff colouring on veins paler and weakly marked. (PI. 8, figs. 276, 277). 



$. Genitalia (Text-fig. 83). Medial area of lamella postvaginalis heavily sclerotized in horse- 

 shoe pattern ; colliculum one and one-half times as long as broad ; ostium bursae broad and 

 shallow, anterior margin sharply defined ; anterior fourth of bursa copulatrix membranous, 

 remainder sclerotized and ribbed. 



Measurements. $ 38-50 mm. ; $ 40-50 mm. 



The species is variable in colour and pattern, displaying a range of poly- 

 morphism similar to that of tulbaghata and nigrisparsalis ; in examples of both sexes 

 the area proximad of the antemedial fascia on the fore wing is ochraceous buff and 

 distad of the postmedial fascia on each wing there is a broad band of the same colour, 

 comparable with tulbaghata ab. flavipleta ; in another example the ochraceous buff 



