Geometridae 
in the relative amount of black and white upon the upper side ot 
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, PlateXLH, 
Fig. 39 . <3 • 
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, 6 . 
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 of 
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. 
