222 
SOUTH-AFRICAN BUTTERFLIES. 
Genus AL^NA. 
Alcena^ Boisd., Voy. Deleg. dans I'Afr. Aust., App., p. 591 (1847). 
Acrcea, Trim, [part], Rhop. Afr. Aust., i. p. 11 1 (1862). 
Imago. — Head small, hairy (especially in front) ; eyes smooth ; 
j)alpi extremely short, inferior hairy, — terminal joint minute, not 
visible ; antenim short, with large, broad, abruptly-formed, flattened, 
spoon-shaped club. 
Thorax short, rather broad, slightly hairy on sides of back, pubes- 
cent on pro thorax. Fore-wings elongate ; cost a almost straight ; apex 
slightly rounded ; hind-margin entire ; inner margin slightly hollowed, 
thinly ciliated ; costal nervure short, ending a little beyond middle ; 
subcostal nervure five-branched, — first and second nervules given off 
before extremity of discoidal cell, — third and fourth not far from each 
other, nearer to apex than to extremity of cell (fourth terminating at 
apex) ; upper radial united to subcostal nervure a little beyond end of 
cell ; discoidal cell of moderate length, rather narrow ; disco-cellular 
nervules transverse, the inferior one slightly inclined outward and 
joining third median nervule at some little distance from latter's 
origin. Hind-wings elongate ; costa very prominent at base, thence 
straight, ciliated throughout ; costal nervure rather short, ending some 
distance before apex ; subcostal nervure branched at extremity of dis- 
coidal cell ; discoidal cell rather short and truncate ; disco-cellular 
nervules almost equal in length, slightly oblique, — the lower one join- 
ing third median nervule (which is angulated at point of junction) at 
some little distance from latter's origin ; internal nervure extending to 
about middle of inner margin, which is fringed throughout with long 
hairs. Fore-legs of $ stout, very hairy (especially the tibia), — tarsus 
short, downy, without distinct articulations, finely spinose beneath, 
without terminal claws ; — of $ fnlly developed, less hairy than in ^. 
Ifiddle and Jiind legs stout, rather short, very hairy, with femora, tibi^, 
and tarsi about equal in length, — tarsi strongly spinose beneath, hairy 
above and laterally, with terminal claws robust, strongly hooked. 
Abdomen of moderate length, thick (especially in $), arched dor- 
sally, blunt at tip, hairy laterally and very hairy beneath (especially in 
towards extremity. 
This genus has undoubtedly been misplaced (from its foundation) 
among the Acra^i7m, to which group it has merely a superficial like- 
ness, and that not a strong one. Mr. H. W. Bates many years ago 
expressed to me his doubt whether the then only known species, A. 
Amazoulctj Boisd., was really allied to Acrcea ; and the receipt since of 
ample material for dissection has enabled me to ascertain that Alcena 
is an aberrant form of Lycasnide related to HUrlania and Pentila. 
In neuration it more nearly agrees with the former genus, but differs 
in the longer discoidal cells and longer costal nervure and upper disco- 
