Vol. I] WILLIAMS— BUTTERFLIES AND HAWK-MOTHS 297 



the deeper color of the senncs. There are a number of Calli- 

 dryas from the Galapagos Islands in the Leland Stanford 

 University Collection, including sixteen ? 5 . Mr. E. J. New- 

 comer has kindly examined these specimens for me and is of 

 the opinion that all the 9 2 are senncB, as probably also the 

 S $ . The insects, as can be seen from the measurements 

 below, average considerably smaller than those from Southern 

 California and some other portions of the United States, and 

 some of the small specimens seem to indicate the dwarfing 

 effects of the arid regions of the islands. SenncF according to 

 Edwards, inhabits Brazil, Central America, Mexico, Texas, 

 Jamaica, Hayti, etc., and is taken in Southern California. 

 Following the smaller size of the Galapagos Callidryas, is the 

 blunter apex of the primaries and inner angle of the second- 

 aries. 



Euhule is an abundant insect and the most conspicuous but- 

 terfly of the Archipelago, having about the same distribution 

 as Agraulis vanillcB galapagensis, and in favorable years, is 

 probably to be found on all but the two northern islets. Wen- 

 man and Culpepper, and the other mere rocks. It occurs 

 abundantly at moderate and low altitudes, and is rarer on 

 summits. From February to April, 1906, it was plentiful in 

 the vicinity of Wreck Bay, Chatham Island, and on Albemarle 

 in the vicinity of the Villamil settlement, where it was some- 

 times seen gathered in numbers about cattle droppings. At 

 Tagus Cove (Albemarle), it was common during March and 

 April, especially at the yellow flowers of Cordia lutea and 

 Gossypium Sp., resting on the blossoms of the latter in dull 

 weather. At Bank's Bay (Albemarle), in April, they were 

 observed feeding at the flowers of Opuntia growing near the 

 seashore. 



The season for adults ended in general, in May, at the 

 lower levels. During early October however, the insect was 

 abundant at 1000 feet elevation; a few were seen during the 

 same month on Charles Island in the dry zone, and in the 

 "Green Zone" on South Albemarle.' 



1 1 have noticed that the Galapagos eubule do not possess as strong or rapid a flight 

 as those found on the mainland, where I have observed them in Lower California and 

 in Kansas, and this inferiority in flight is quite striking. 



