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). 



Orthostixis. Chesias. 



Acalia. Siona (and Asia). 



Eminelesia. Gypsochroa (and Asia). 



CoUix (and Asia and Africa). Staninodes (and Asia). 



Pelurga. Tanagra. 



Of the genera foinid in Nortli America, species of Hcteroloclta occur in 

 Asia Minor, Abyssinia, Quito, and Venezuela, o^ HemerophUam the Eastludies 

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

 Colorado), is very fully represented in Europe and Asia; lod'is 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 PIIAL^ENIDyE.* 



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

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

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

 causes, it is necessary to have before us individuals from regions as wiile 

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

 species of PhaUenidas, I have been fortunate enough to obtain individuals of 

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

 while I he arctic species found in Lal)rador and the White Mountains have 

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

 was enal)led, 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 elevation of 8,000 feet, and to do some work above timber-line on the 

 alpin(! summits of Arapahoe, Gray's,and Pike's Peaks in Colorado. The rcvsults 

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



• The remarks under this head are reproduced, with some additions and alterations from au essay 

 " On the Geographical Distribution of the Moths of Colorado", in the Annual Report of the United States 

 Ge()lor;ical and Cicographical Survey of the Territories for 1873. 



