100 ENTOMOLOGICAL NEWS. [ Mar., 16 
with white, making them stand out prominently. The various other 
markings are the same as in the typical form. 
9. Measures 28 to 32 mm., in most of the specimens examined 31 
or 32. 
Upperside: Somewhat lighter in tone than the males, yet of the 
same smoky grey. Spots larger than in the males but with the same 
characteristics. Other markings same as in the males. Lighter area 
on primaries more pronounced. 
Underside: Also lighter than in the males and in the limbal area 
there is a distinct light patch, most pronounced in the spaces on either 
side of the third median nervule. The spots are prominent, as in the 
males. i 
Described from 17 males and 8 females, collected in 1912, 
1913, 1914 and 1915, of which one male is designated the type 
and one female the allotype. The type and allotype are in the 
collection of R. A. Leussler at Omaha, Neb. 
The habitat of this variety is a spring-fed marsh in Sarpy 
County, Nebraska, a few miles south of Omaha, where wild 
rice, rushes and tall coarse grasses flourish. 
It seems quite probable that this form of canthus has been 
developed as a result of geographical isolation. 
A striking character of this variety is its very large size. 
Holland in his Butterfly Book gives the expanse of canthus as 
from 1.65 to 1.90 inches. A number of Michigan specimens 
examined vary from 21 mm. to 25 mm. in the dimension cor- 
responding to that given above. Minnesota specimens average 
slightly larger, and apparently the species tends to become still 
larger farther west. 
Edwards figures a dark canthus in Vol. HII of his Butter- 
flies of North America (fig. 5, Pl. 1, Satyrids) which he desig- 
nates “var.” and in the text refers to some large Colorado ex- 
amples, which he states exceed any eastern ones, the males 
being 2.2 in. and the females 2.4 in. in expanse. Then he adds 
“but they do not differ in other respects from their congeners.” 
The variety here described besides being of very large size 
differs very materially from its congeners. 
For purposes of comparison specimens of typical canthus 
from Michigan are shown in Figs. 3 and 4 in the plate. 
