( Iexa) 
photomicrographs of the ova im situ on the under-side of the 
nut-leaf, and of three varieties of the micropyle of the ovum, 
the former (x 40), the latter (x 250). These photomicrographs 
were by Mr. F. N. Clark and admirably showed the surface of 
the ova and the structure of the micropylar area. 
Mimetic PARALLELISM IN Five GENERA OF AFRICAN PIERINES. 
—Dr,. F. A. Drxery exhibited series of specimens belonging to 
five different genera of African Pierine. He remarked that 
the exhibit was arranged so as to show the parallelism exist- 
ing between many species of these genera, a parallelism which 
it could hardly be doubted was in most,*if not in all cases, of 
mimetic significance. The genera included in the exhibit 
were Mylothris, Phrissura, Pinacopteryx, Belenois and Leucer- 
onia. The members of the same genus were arranged in 
vertical rows, while the species of different genera showing a 
similar appearance were set out side by side, horizontally. 
The various assemblages, each presenting a distinct pattern, 
with their constituent species, were as follows :— 
I. White with dark marginal spots. Mylothris agathina, 
Cram., 6; Pinacopteryx rubrobasalis, Lanz., 6; Belenois thysa, 
Hopft. ¢; Leauceronia argia, Fabr., 9. 
Ii. Brownish-yellow with dark marginal spots. M. agathina, 
2; Pinacopteryx vidua, Butl.,?; B. thysa, 9 (dry season). 
Some specimens of Pinacopteryx astarte, Butl., 2; of Belenois 
theora, Doubl., 9 ; and alsoa form of LZ. argia, 2, belong to this 
group, but were not shown. 
Tif. White with dark apical patch and dark marginal 
spots. Phrissura phaola, Doubl., 3; Pinacopteryx dixeyi, 
Neave, ¢; Belenois theuszi, Dewitz, 6; L. argia, 6. 
IV. The same, with a slight brownish-yellow basal suffusion. 
M. poppea, Cram., 3; P. dixeyi, 2 ; Belenois ianthe, Doubl., 9 ; 
Leuceronia thalassina, Boisd., ? . 
V. White; marginal dark spots tending to become streaks ; 
an orange or pinkish basal flush. Jf. poppea, 9; Phrissura 
isokani, Gr. Smith, 9 (= P. phebe, Butl.); B. zanthe, 2; 
Belenois sp. (allied to B. thysa), 9; L. argia,@. 
VI. Fore-wings brownish-yellow with dark margins ; hind- 
wings white or creamy with dark marginal spots. J/ylothiis 
sprea, Mésch., 2; Phrissura sylvia, Fabr., 2 ; L. thalassina, ? . 
