An Annotated List of the Lepidoptera ot Oki. 



BY 



T. Wliyake, BipahisM, 



As that small group of islands in the Sea of Japan, known by the 

 name of Oki, has never before been visited by entomologist, I went there 

 in 1906 with the chief aim of obtaining an insight into the Lepidopterous 

 fauna of the locality. My stay on the islands extended from Aug. 5th 

 to 27th. 



Oki lies about forty-five miles due north of the Province of Izumo, 

 which is the nearest region of the main island of Japan on the western 

 coast. It consists of four islands, of which the largest (9 miles across) is 

 called Dôgo, while the three others are collectively known by the name of 

 Dozen. The three islands of Dozen are Nakanoshima, Nishinoshima and 

 Chiburishima, all which lie close together and are separated from the 

 more seawardly situated Dögo by a strip of sea six miles wide. The first 

 half of my stay I spent in Dögo and the last half in Dozen. I have found 

 the former to be a more favorable place for collecting than the latter. 

 This evidently stands in relation with the fact that while Dögo is moun- 

 tainous and well wooded, there is in Dozen but little uncultivated land left. 

 Limited as I was in time, I have been able to collect myself no less than 

 300 specimens of Lepidoptera, referable to 120 speceis. 



At a place called Hatta in Dögo, there is an Agricultural Experiment 

 Station belonging to the prefectural office of the district (Shimane-Ken). 

 It was a great fortune of mine that I became acquainted with the chief of 

 the Station, Mr. Tanaka, who proved to be an enthusiastic collector of 

 insects. In the Station I have found over 300 well-preserved specimens 

 of butterflies and moths, all collected by him in the islands. For placing 

 this collection at my disposal for examination and for many other favors 

 bestowed upon me, I beg here to express my sincere thanks. 



