568 



jilaced opposite their name, and those confined to the Atlantic Province only 

 have a dagger (f) ) : 



SUBARCTIC SPECIES MOSTLY COMMON TO EASTERN AND WESTERN AMERICA, 



AND EUROPE-ASIA. 



*(Tlauc()pteryx ca^siata. *Petropl)ora populata. 



magiioliata. *Ochyria ferrugata. 

 Epirrila * f cambricaria (also Si- * muiiitaria. 



beria). abrasaria. 



*dilutata). ^ Rheiimaptera basaliata. 



*Hydri()mena trifasciata. *fluctuata. 



*Petrophora truncata. ^ *lugubrata. 



hersiliata. *tristata. 



ciinigerata. *hastata. 



]iriniata (vans, lu- *Carsia pahulata. 



gubrataand nu- *Operlioptera boreata. 

 bilata). 



These species are in part members of the Canadian fauna, which is, 

 perhaps, not so distinctly marked for insects as for birds ; they also follow the 

 isothermals of 44° and 48° southward into Colorado and California. In Col- 

 orado, tliey range from an elevation of about 8,000 feet to tlie limit of trees 

 (11,000 feet). It will be observed by an examination of the isothermal line 

 of 44° (on the Smithsonian chart) that it runs south of Eastport, Me., passes 

 through Augusta, Me., runs north of Concord, N. H., and then sweeps up so 

 as to embrace Lake Champlain, curves south of the Adirondack Mountains, 

 then makes a sudden sweep in a northeasterly direction so as to embrace 

 Montreal ; then crosses Lakes Huron and Michigan a little south of Mack- 

 inac, including Lakes Erie and Ontario ; thence taking a general northwest- 

 erly course to the base of the Rocky Mountains near Helena, Mont. On the 

 Pacific coast it surrounds the Cascade range and the Sierra Nevada. But at 

 Victoria, Vancouver's Island, where Mr. Crotch collected several of the forms, 

 the annual temperature is from 48° to 52° F., coresponding to the temperature 

 of Southern New England and New York, Pennsylvania, and the greater 

 part of Ohio and the Alleghany Mountains, or the Alleghanian fauna. 



The following species occur east of the Great Plains and north of Mex- 

 ico, a few extending into Colorado : 



