er iat”) 
IX. On Lepidoptera from the White Nile, collected by My. 
W. L. S. Loar, F.Z.8.; together with further notes 
on Seasonal Dimorphism in Butterflies. By Dr. 
Freperick A. Drxry, M.A., M.D., Fellow of Wad- 
ham College, Oxford. 
[Read March 18th, 1903.] 
PEATE Vik 
Mr. W. L. 8. Loat, during his tenure of office as super- 
intendent of the Nile Fish Survey under the Egyptian 
Government, spent more than three years in a scientific 
investigation of the waters of the Nile and its tributaries. 
Though his biological activities were mainly engaged in 
other directions, he took several opportunities of collecting 
butterflies; and the specimens captured by him in April 
1901, and in January and March 1902, are in many 
respects of great interest. They are generally in excellent 
condition, and are accompanied by ample data; but the 
collection (which has been liberally presented by Mr. Loat 
to the Hope Museum at Oxford) derives what is perhaps 
its greatest value from the fact that the specimens are 
marked in such a manner as to allow all those caught at 
one time and in one spot to be grouped together. The 
captor informs me that on these occasions no voluntary 
selection was made oa his part; that he tried, in fact, to 
catch all he saw; so that each of his “ bags” may be taken 
as a fair sample of the butterfly life that was at that 
particular time on the wing. 
The localities of Mr. Loat’s captures are as follows :— 
J. Wuitrrt NILE; GHARB-EL-AISH, near KAKA; about 
Hite NES bats 
IJ. Wurre NILE; near Kaka; about 10° 30’ N. Lat. 
III. BAwR-EL-GEBEL (Nile); near MANGALA; about 5° 
Ne Dhak 
IV. BAHR-EL-GEBEL (Nile); GonpoKkoro; 4° 43’ N. Lat. 
Several of the species obtained from all these localities 
are well known to be seasonally dimorphic. As will be 
seen later, the present collection contains a preponderance 
TRANS. ENT. SOC. LOND. 1903.—PART II. (JUNE) 10 
