THE 
TRANSACTIONS 
ENTOMOLOGICAL SOCIETY 
LONDON 
For tHE YeEaAR 18938. 
a 
I. A revision of the genus Ypthima, with especial reference 
to the characters afforded by the male genitalia. By 
Henry J. Ewes, F.L.S., F.Z.S., President of the 
Entomological Society, &c., and James Epwarps, 
F.E.S. 
[Read November 2nd, 1892.] 
Prares 1, 10., & TEL. 
Tuer genus Ypthima has been for many years a stumbling- 
block to lepidopterists, on account of the difficulty of 
separating certain of the species by any outward cha- 
racters, of the great variation in the seasonal forms, 
and the impossibility of satisfactorily determining several 
of the species described by the older authors. When, 
therefore, I attempted, with Mr. Edwards’ help, to 
arrange the large number of specimens in my collection, 
and he suggested that an examination of the male geni- 
talia might furnish characters of as great value in 
separating them as I had previously found those derived 
from the form of the pouch in the genus Parnassius to 
be, I welcomed his proposal to make a careful study of 
them; and, though in some cases the species we have 
recognised must remain doubtful for the present, and we 
do not consider our arrangement as more than pro- 
TRANS. ENT, 80C. LOND, 1893.—PART I. (MARCH.) B 
