THE GEOGRAPHICAL DISTRIBUTION OE THE PUAU:N1D/E OF 



THE UNITED STATES. 



The following remarks are based on tlie species which I have been able 

 to examine, and not those noticed in the [)receding pages nnder the head of 

 Desiderata. The material has been scanty, and therefore the following essay 

 shonhl be regarded as merely a provisional sketch of the subject, wiiich will 

 require years of research to render at all complete. 



The Phaltenid moths of America north of Mexico and the West Indies 

 may be divided into those which are inhabitants of the Arctic Realm and 

 North Temperate Realm, adopting these terms as restricted by Mr. J. A. Allen.* 

 The species belonging to the Arctic realm may be divided into two assem- 

 blages—one the high Arctic region, embracing Greenland and the northern, 

 coast of Labrador, and in one case {G. jjolata) the alpine summits of Lapland. 

 They have not as yet occurred south of the isotherm of 32°, viz, on the alpine 

 summits of New England or the Rocky Mountains. The list comprises but 

 four species, and there seems to be uq alpine zone comprising (liem. 



PURELY ARCTIC SPECIES NOT FOUND SOUTH OF GREENLAND OR LABRADOR 



NOR ON ALPINE SUMMITS. 



Glaucopteryx polata. Glaucopteryx phocaria. 



sabiniaria. Acidalia senlinaria. 



The species which apparently range between the isotherm of 32° and 

 44° F., and are circumpolar in tlieir distribution, and in Europe and America 

 often extend southward into the lowlands of the North Temperate Realm, may 

 be placed under the following head (those living in Europe have an a sterisk (*) 



'On the Mammals and Winter Birds of East Florida, etc., BuU. Mus. Comp. Zool., ii, 3, 1&71. 



567 



