24 MR. S. A. NEAVE ON* BUTTERFLIES [Jan. 18, 



a mimetic race of rhodesiana, but until there is more evidence on 

 the point, I think it should stand as a distinct species. 



I captured four males and three females of this species, two 

 in the extreme south-east corner of the Katanga region of the 

 Congo State, and the remainder over the British border in the 

 Serenji district of N.E. Rhodesia, xii. 1907. It was flying about 

 woodland and old native gardens and had a fairly strong and 

 steady flight. Owing to its rosy colour when fresh it bears on 

 the wing a strong resemblance to Mimacrasa marshalli Trim., 

 more so than to A. encedon or Limnas chrysippus. 



Acr^ea detecta, sp. n. (Plate I. figs. 6, 6 a, 3 .) 



This species is allied to A. caldarena Hew., which it closely 

 resembles in general appearance. The ground-colour is much 

 more fulvous and is without the pinkish tinge of that species 

 except in some of the very dry specimens. The primaries have 

 a more rounded apex and are markedly less heavily scaled 

 than in caldarena. Though of the same general character there 

 are some important distinctions in the genitalia of these two 

 species. The ventral harpes of detecta are broader and much 

 more rounded than those of caldarena. The penis is also very 

 characteristic, in detecta being very slender, curved and with a 

 distinct barb at the tip. In caldarena it is a stout, straight organ 

 and lacks a barb (PI. I. fig. 6 b). Owing to the fact that both of 

 these species often die with the penis extruded, it is frequently 

 possible to detect this latter character without dissection. 



3 . Upperside. — Primary. Much as caldarena but the black 

 apex usually somewhat narrower and inwardly less well defined. 

 Spotting variable and often much reduced. A well marked 

 spot within cell and a discocellular always present. One, two, 

 or three subapical spots (occasionally four in females) form 

 a row near inner edge of the black apex. A small spot in area 

 1 b, below cell near its middle (often absent). Of the two spots in 

 areas 1 6 and 2 (the latter sometimes absent) which lie below end 

 of cell, the former is placed a little distally to the latter (not 

 immediately below it or a trifle proximally to it as in caldarena). 

 As regards this character, detecta is intermediate in markings 

 between the two groups of which caldarena and acrita may be 

 taken as typical. There also is occasionally a small submarginal 

 spot in 1 b 



Secondary much as in caldarena but more rounded, the basal 

 black better defined. The arrangement of the spots also differs 

 but is best described from the underside. 



Undeijside. — Primary as upperside but without the black apex. 



Secondary. Spots on the whole as in caldarena but larger and 

 more rounded, this is especially noticeable in the more distal of 

 the two spots within the cell, which is never elongated as in 

 caldarena. Of the spots in the discal row, that in area 5 is 

 much more distally, that in area 2 more proximally placed, 

 giving a very different appearance to this row. The basal pink 



