6 Mr. R. Trimen on 
border in the forewing, as well as sublunulate linear dark 
marks in the hindwing. On the underside the two species 
in the main agree; but in. the forewing, LZ. gigantea has 
actually and relatively much larger terminal disco-cellular 
and discal spots, and a much stronger and more continu- 
ous submarginal black streak, but it wants the succeeding 
marginal series of black spots found in L. lewcon ; while in 
the hindwing the spots are all relatively smaller, and (as 
in the forewing) there are no hindmarginal spots except 
the blue-scaled ones below 2nd median nervule,—the tail 
being shorter and not white-tipped. 
L. gigantea is not so nearly allied to either LZ. perpulchra 
or L. mashuna, Trim., which are similarly characterised by 
the heavy black spotting of the underside * but have no 
tail on the hindwing. The extraordinary size of the 
terminal disco-cellular spot, and the great elongation of 
the fourth spot of the discal series, in the forewing, and 
the black subterminal streak in both wings are features 
of the underside which at once distinguish L. gigantea. 
The lilacine-blue tint of the male on the upperside brings 
it nearer to LZ. mashuna, but the dull-white ground of the 
underside resembles that of L. perpulchra. ‘The very 
much greater size is also of importance, L. gigantea being 
the largest Lycwna known to me, while LZ. perpulchra does 
not exceed 1 in. 9 lin. (2?) and LZ. mashuna 1 in. 8 lin. (2 ) 
in expanse of wings. 
Five specimens of this exceedingly fine Lycwna were 
taken by Mr. Marshall, a male in the Mazoe Valley on the 
16th October, 1894, and three other males with a female at 
Gadzima, Umfuli Valley, Mashunaland, on 18th December, 
1895. The first-named male was flying through fairly thick 
bush in which there were few or no flowers, and settled 
on the ground among some dead leaves. 
* There is some ground for believing that this great and unusual 
development of the black spots on the underside is in imitation of 
certain Acrexe, especially in the case of LZ. mashuna, in which the 
ground-colour is ochre-yellow. Mr. Marshall wrote to me that on 
20th October, 1894, he saw two of this Lycena sleeping on the end 
of a stem of dry grass among a number of Acrexa nohara and A. 
caldarena, and was struck with the general similarity of their under- 
side to that of the Acree; he also noticed that in the attitude of 
repose the forewings of the Lycwna were well depressed between 
the hindwings, giving the insect the elongate outline of an Acra. 
