(ae) (I, li 
damp patches of soil for the sake of absorbing the moisture. 
This phenomenon occurs to some extent in temperate regions, 
but it is in tropical and sub-tropical districts of both the old 
and the new world that the size and frequency of such 
assemblages have attracted most attention. Mr. Distant 
(‘Rhopalocera Malayana,’ 1882-1886, pp. 284, 285) has brought 
together several instances from the experience of various 
travellers, and many others are on record. By the kindness 
of Professor Poulton I am able to show representative 
examples of 153 specimens captured under these conditions 
by Mr. C. A. Wiggins, a well-known official of the British 
East African Protectorate, to whom Science is indebted for 
the fine collection of Rhopalocera from Uganda lately described 
by Mr. Neave (‘Novitat. Zoolog.,’ vol. XI, 1904). Mr. Wiggins’s 
note to the series represented by the exhibit is as follows :— 
‘*¢ All these (over 150) were caught in one sweep of the net 
over a pool within a few yards of the Ripon Falls, Jinja, Lake 
Victoria Nyanza, by C. A. Wiggins, on Feb. 2, 1906.’ 
“The catch consists entirely of Pierines of the two genera 
Pinacopteryx and Belenois. Eight species are represented, the 
numbers being as follows :— 
Pinacopteryx vidua, Butl. ; 4 A 5 . 104 
a pigea, Boisd. (northern form) . ey 
. liliana, Grose Smith . . ‘ 3 5 
Belenois solilucis, Butl. . é : 1 
an subeida, Feld. (form nc trae Butl. fi ; 8 
» formosa, Butl. . : ; ; , oe 
3) gidica, Godt. ‘ j 1 
»  severina, Cram. (form boners Feld.) 5 
Total : ‘ . 153 
‘‘ Every one of the 153 specimens is a male. “The B. gidica 
is of the ‘ wet-season’ form, the others are all more or less ‘dry.’ 
The great preponderance of P. vidua is noticeable, as is also 
the generally good condition of most of the specimens making 
up the somewhat significant figure of the total.” 
In answer to questions, Dr. Dixty said that he had no 
further information from Mr. Wiggins than that which he 
had already given. He should be disposed to infer from the 
words, ‘‘caught in one sweep of the net over a pool,” that 
