IOO ENTOMOLOGICAL NEWS. [Mar., 'l6 



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. 



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. Ill of his Butter- 

 flies of North America (fig. 5, PI. I, 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 canthns 

 from Michigan are shown in Figs. 3 and 4 in the plate. 



