584 



European genera not found as yet in the United States — Continued. 



Abraxas (and Asia). Eubolia (and Asia, Africa, and 

 Ligdia (and Asia). \ Chili). 



Lomaspilia. Anaitis (and Asia). 



Ortbostixis. Chesias. 



Acalia. Siona (and Asia). 



Emmelesia. Grypsochroa (and Asia). 



Collix (and Asia and Africa). Stamnodes (and Asia). 



Pelurga. Tanagra. 



Of the genera found in North America, species of Heterolocha occur in 

 Asia Minor, Abyssinia, Quito, and Venezuela, of Hemerophila in the East Indies 

 and Asia; Cfnophos, which has but a single species in North America (in 

 Colorado), is very fully represented in Europe and Asia: lodis occurs in 

 Europe, Asia and India, Australia, Tasmania, and Brazil; Acidalia is cosmo- 

 politan, species occurring in the several continents and Tasmania, Mada- 

 gascar, Isle Bourbon, Mauritius, Cape of Good Hope, and Chili. 



ON CLIMATIC VARIATION IN THE PIIALiENID^E* 



In examining into some of the causes of variation among species, atten- 

 tion is naturally given first to the influence of meteorological or climatic 

 agencies upon organisms. In order to study the variation due to climatic 

 causes, if is necessary to have before us individuals from regions as wide 

 apart as possible. In studying the subject as applied to our arctic and alpine 

 species of Phalaenidae, 1 have been fortunate enough to obtain individuals of 

 the same species from- Iceland, Norway, and the Alps of Central Europe, 

 while the arctic species found in Labrador and fhe White Mountains have 

 been studied under tolerably favorable auspices. In the summer of 1875, I 

 was enabled, by a few weeks' connection with Professor Hayden's Survey, 

 to make a superficial examination of the insect-fauna of Colorado and Utah 

 above an elevat ion of X,000 feet, and to do some work above timber-line on the 

 alpine summits of Arapahoe, Gray's,and Pike's Peaks in Colorado. The results 

 of my collecting fully confirmed the impressions 1 had received from the col- 



' The remarks under this head are reproduced . with some additions and alterations from an essay 

 ■•(in tin Geographical Distribution of the Moths of Colorado", in the Annual Report of the United States 

 Geological and Geographical Survey of the Territories for 1873. 



