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XVII. Notes on the dominant Milllerian group of Butterflies 

 from the Potaro District of British Guiana. By 

 William J. Kaye, F.E.S. 



[Read October 3rd, 1906.] 



Plates XXIII— 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 

 I am 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 80 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, i. 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 III. (jAN. 1907) 



