_ 
10 Mr. H. Eltringham on the Forms and 
walls are less widely separated. It is in the uncus, how- 
ever, that the greatest difference is shown. It is produced 
dorsally into a long curved extremity, somewhat hollowed 
beneath, and slightly widened laterally at its termina- 
tion. Whilst all the forms of dycoa from its western type 
to its most extreme modification in the Abyssinian sub- 
species present no noticeable change in the structure of 
these organs, so all the forms of johnstoni, from the typical 
male to confusa and fulvescens, and the subspecies torwna, 
show the same form in the male genitalia, especially char- 
acterised by the extremely long uncus and slender penis. 
That these features are of specific value I have no doubt, 
since I have also made preparations of the genitalia of 
other nearly allied Acracas, and find that they present 
features which I need not here specify further than to say 
that they are entirely different and characteristic. 
The male genitalia of the torwna form shown at fig. 3 
afford little or no distinction from those of johnstont. The 
claspers appear to be more distinctly lobed, but this is 
a variable feature, and is found more or less developed 
in some examples both of lycoa and johnstoni. The details 
of the articulation of the claspers with the vinculum are 
apparently rather different, though this point is not at 
all reliable in a microscopic specimen, as the appearance 
often varies with the point of view. The penis certainly 
exhibits a similar formation to that of yohastoni, and differs 
in the same degree from that of /ycoa. The uncus is 
similar to that of yohnstoni. There can be no doubt that 
toruna is as distinct from lycoa as is johnstoni, and further, 
that so far as the genitalia are concerned, it is indis- 
tinguishable from other forms of johnstoni. It appears to 
be rare, and is certainly a local form and, as already 
stated, I think it must be regarded as a geographical race 
or subspecies of johnston. 
Finally, we are now acquainted with the larvae both of 
A, lycoa and A. johnstoni, and it will be of interest here to 
compare them. 
The larva of A. lycoa is figured by Aurivillius (Ent. 
Tidskr., Plate 5, fig. 2, 1893), and is thus described :— 
“The larva is yellowish without markings, with biack 
head and black spines. The thorns are scarcely as long 
as the diameter of the body.” The figure shows the larva 
as having all the spines black, including those of the sub- 
lateral row, whilst the body has no rings or markings of any 
