20 MR. S. A. NEAVE OX BUTTERFLIES [Jan. 18, 



A third form which may belong to both the above, so far as its 

 hind margin is concerned, is characterised in the primary by the 

 absence of the row of five spots beyond the end of the cell. This 

 absence of spots coincides with a considerable increase of size in 

 the basal spots of the primary, with the result that examples of 

 this form have a marked resemblance to acrita Hew. A further 

 complication which occurs in small numbers throughout all the 

 forms, is the presence of a more or less heavy black apex to the 

 primary. It must be also remembered that intermediates between 

 all and each of the above forms occur. Further, I have been 

 unable to find any differences in the genitalia of the extremes of 

 the various forms, although the latter are so unlike as to have the 

 appearance of distinct species. 



ACRiEA ACUTIPENNIS. 



Acrcea acutipennis Lathy, Trans. Ent. Soc. 1906, p. 2, pi. i. fig. 3. 



The collection contains four males of this recently described 

 species, one captured on the Lualaba river, iv., and three others 

 on the Lufupa and Lubudi rivers, x., xi. One specimen is very 

 much more heavily marked than the type, especially on the 

 secondaries, where many of the spots are " run." The abdomen 

 also is black. 



Acr^:a lactea, sp. n. (Plate I. fig. 7, § •) 



A very pale species covered on upper surface with whitish 

 scales. 



5 . Upperside. — Primary. The whole wing, except for a 

 moderate dusky apex, thinly covered with whitish scales ; a faint 

 discocellular dusky spot ; two similar ones in 1 b and 2, the latter 

 below end of cell, the former nearer the margin. A very narrow 

 line of black along outer margin from black apex to posterior angle. 



Secondary. More heavily scaled with whitish through which 

 under-surface markings are visible ; some of the spots of discal 

 row slightly pigmented with dusky on upper surface. A narrow 

 outer-marginal black line somewhat invading the wing along the 

 veins. 



Underside. — Primary as upperside but apex greyish. 



Secondary. Pale cream ground with following black spots : — a 

 precostal ; two in cell ; two each in la, lb, 1c near base ; a 

 discocellular ; two below costa and a discal row of seven of which 

 those in areas 2 and 4 are placed nearer cell and those in 1 c 

 and 3 are large and of irregular shape ; those in 1 a, lb, lc, and 

 4 are connected with spots nearer the base by rose-coloured 

 internervular streaks. The fenestrated black outer margin 

 encloses seven pale ochreous spots with a trace of an eighth at 

 anal angle. The inner edge of this margin is marked by a series 

 of brick-red internervular streaks which increase in size toward 

 anal angle. 



Fringe of both wings dusky. 



Palpi very pale ochreous nearly white ; thorax black with two 



