Report upon a Collection op Diuknal Lepidoptera made 

 IN Alaska by the Scientific Corps of the Russo-Amer- 

 ICAN Telegraph Expedition under the Direction of 

 Lieut. W. H. Dall. By Samuel H. Scudder. 



The diurnal Lepidoptera mentioned below were obtained by Mr. 

 Dall, during two successive summers, on different parts of the Yukon 

 River, from Fort Yukon near the British Boundary to the mouth of 

 the river. It is liardly probable that they embrace all the species 

 occurring there, since half of the species are represented in this col- 

 lection by only a single specimen. 



The " Ramparts " mentioned below are canons, commencing two 

 hundred miles below Fort Yukon, where the river is narrow, deep 

 and swift, running for one hundred and fifty miles between high 

 mountains; neither birds nor many butterflies were found there. The 

 " Mission " is situated a little above the broad southern bend which 

 the river makes near its mouth. 



In addition to the species enumerated here, Mr. Dall writes that he 

 frequently saw Lyccence so high in the air as to be difficult to catch, 

 and which may not have been the species mentioned below. He also 

 saw a single specimen of Vanessa Antiopa at Nulato, May 20 (?), but 

 could not obtain it. One caught at the same place in July, was 

 afterwards given him, but lost. He also thinks he saw the larva of 

 the P.ime species crawling on the snow on the banks of the Unalakleet 

 River (flowing into Norton Sound), Nov. 26111, when the thermome- 

 ter registered -\o° Fnhr. 



The species of Erebia, Pieris and Papiho, always appeared in large 



