Geometric! je 



in the relative amount of black and white upon the upper side of 

 the wings. The moth is found all through northern Europe and 

 Asia, and is widely distributed through the northern United States 

 and Canada as far west as Alaska, where it is very common. 



(2) Rheumapteraluctuata Denis & Schiffermuller, Plate XL11, 

 Fig. 39, $ . 



The remarks made as to the preceding species apply equally 

 well to the present. I have received it in recent years in great 

 numbers from Alaska. 



(3) Rheumaptera rubrosuffusata Packard, Plate XLII, Fig. 



38,5. 



The moth is a native of the Pacific States. 



Genus PERCNOPTILOTA Hulst 



This genus is represented in North America by a single species, 

 Percnoptilota fluviata Hubner, which is shown on Plate XLII, 

 Fig. 48, by a male specimen. The moth also occurs in Europe 

 and northern Asia, and has been described under at least fifteen 

 different names. The synonymy is too extensive to burden the 

 pages of this book with it. 



Genus MESOLEUCA Hubner 



This is an extensive genus found in the temperate regions ot 

 the northern hemisphere on both sides of the Atlantic. 



(1) Mesoleuca ruficillata Guenee, Plate XLIII, Fig. 21, $. 

 The habitat of the species is the northern United States and 



southern Canada. 



(2) Mesoleuca gratulata Walker, Plate XLII, Fig. 47, $ . . 



Syn. brunneiciliata Packard. 



The insect is found in the Pacific subregion. 



(3) Mesoleuca lacustrata Guenee, Plate XLII, Fig. 50, ? . 

 This is not an uncommon species in Europe and the northern 



portions of the United States and in Canada. 



(4) Mesoleuca intermediata Guenee, Plate XLII, Fig. 49, ? . 

 The moth occurs in the Atlantic States. 



(5) Mesoleuca hersiliata Guenee, Plate XLII, Fig. 46, $ . 



Syn. flammifera Walker. 



The home of the species is in the region of the Rocky Moun- 

 tains. It is not uncommon in Colorado. 



330 



