132 [November, 
SYNOPSIS OF THE GENUS BOREUS. 
BY DE. H. A. HAGEN (of Konigsberg). 
1. — B. HiEMALis, Linne. 
Bronze-brown ; beak, antennae, legs, wings, appendices of the 
male, and borer of the female, clear brown, the antennae dark brown 
at the apex ; wings of the male long, acute, curved, and pectinated 
internally ; first abdominal segment of the male with an erect trans- 
verse fold in the middle above, long, rather longer than broad ; second 
segment with a similar fold, but smaller, almost in the form of a tuber- 
cule ; lamina below the appendices long, triangular, elliptic at the apex. 
Habitat : Germany, Hanover, East Prussia. 
2. — B. "Westwoodii, Hagen. 
Bronzy-green ; beak, antenn.ne, legs, wings, appendices of the male, 
and borer of the female, yellow ; antenna? and legs dark brown at 
the apex ; first abdominal segment of the male with a fold, as in B. 
hiemalis ; second segment with a quadrate fold, smaller ; lamina broader ; 
slightly grooved at the apex. 
Habitat : Germany, !Pinland, England. 
This is the species figured by "Westwood in the frontispiece to 
his " Introduction," and probably also that described by Curtis and 
Stephens. 
3. — B. NivoRiUNDUs, Asa Fitch, 
Similar to B. hiemalis ; differs in the wings of the male, which are 
broader, shorter, and less curved ; first and second segments above 
without a fold ; abdomen above clothed with a fine grey pubescence. 
Habitat : North America (New York). 
4. — B. BEUMALis, Asa Fitch. 
Uniform shining black ; wings of the male blackish-brown, long, 
slender, rather strongly pectinated, especially at the apex ; first and 
second segments without a fold ; lamina broad, emarginate at the apex. 
Habitat : North America (New York, Washington) . 
I have compared the males and females of all four species, and 
also Fitch's types. The size is nearly the same in all ; B. Jiiemalis is 
the largest, B. Irumalis the smallest, the others intermediate ; but the 
differences are slight. 
