(Cor a 
XVII. Notes on the dominant Miillerian group of Butterflies 
from the Potaro District of British Guiana. By 
WILLIAM J. KAYE, B.ES. 
[Read October 3rd, 1906. ] 
Pirates XXITI—XXVII 
At the request of Prof. E, B. Poulton I have undertaken 
to give some account of the Bionomics of British Guiana 
insects, especially of the Lepidoptera. The long and 
interesting paper by Mr. G. A. K. Marshall in the Trans- 
actions for 1902 has also impressed one that perhaps similar 
notes from another continent, though in no sense so full and 
complete, might not only prove of interest but perhaps of 
value in clearing up some debatable points. For the most 
part deductions have been made in the present case from 
the accumulation of specimens and no such experiments 
as recorded by Mr. Marshall can be given. Dates and condi- 
tions of capture have been recorded, and in many instances 
Iam able to give my own observations on the specimens 
in Nature. Furthermore my collector, Mr. C. B. Roberts, 
who has been the whole time on the same ground, is able 
to supply many facts which are of value. It is a little 
unfortunate that he is not a trained naturalist or his notes 
might have been much fuller and more complete. The 
specimens that he has captured are however taken all 
together so remarkable that the bare list of what has 
occurred in one particular forest-path, would probably be 
thought sufficiently interesting. Besides this particular 
district—a forest road stretching for 16 miles back from the 
Potaro river about 30 miles above its confluence with the 
Essequibo—I personally in March, April, May, and early 
June in 1901, collected in many other districts, but I 
propose to deal chiefly if not exclusively with the joint 
captures by Mr. C. B. Roberts and myself made on the 
Potaro road. The road is more or less a winding track 
varying from 12 to 15 or even 20 feet wide and is in 
places on sandy soil, in others gravel, and is crossed with 
“corduroy” * for a great part of its length, while a small 
part is built up with the natural gravel. On either side it 
* “Corduroy” is the term employed for a road made similarly to 
a railway track, 7. e. with the small trunks of trees split in half and 
laid close together with the flat side downwards. 
TRANS. ENT. SOC. LOND. 1906.—PART II. (JAN. 1907) 
