EXPLANATION OF PLATE A. 
The Figs. 1-6 refer to Danais erippus, male; 7-12 to D. gilippus, 
male. 
Figs. 1 and 7. —Hind-wing, upper surface, natural size. The numbers 
of the nervures are those of Herrich-Schaeffer, but the nomenclature is 
that of Doubleday. 
la, internal nervure. 
lb, submedian nervure. 
2, first branch of the median nervure. 
3, second ,, ,, ,, 
4, third „ 
5, discoidal nervure. 
6, second branch of the subcostal nervure. 
7, first „ „ 
8, costal nervure. 
р, precostal nervure. 
s, sexual spot (Doubleday). 
Figs. 2 and 8.—The sexual spot, magnified 5 times. 
n, first branch of median nervure. 
s, sexual spot. 
Figs. 3 and 9.—Transverse section of the sexual spot, magnified 15 
times. 
n, first branch of median nervure. 
i, lower wall of the cavity of the sexual spot. 
s, upper „ „ „ 
Figs. 4 and 10.—Part of the inner membrane of the cavity, magnified 
180 times. 
a, points of insertion of scales. 
b, one of the scales. 
с, points of insertion of the hairs, which are wanting in D. gilippus, 
only the points [of insertion] remaining. 
Figs. 5 and 11.—Ordinary scales from the upper surface of the hind- 
wings, magnified 180 times. 
a, lower scales. 
b, upper scales. 
Fig. 4 b .—One of the same scales in its natural position. 
[Fig. 5b. —Is not mentioned in text or explanation ; it undoubtedly 
represents the arrangement of the scales shown separately in Fig. 5, viz. 
those of D. erippus. —E.A.E.] 
Figs. 6 and 12.—Scent-organ, seen from above, twice the natural size. 
a, last abdominal segment. 
b, scent-organ. 
