URBICOLA COMMA. 163 



labelled "Colorado, Scudd." (a $ and $ of which are distinctly of Central 

 European form), and three labelled "Manitoba, Scudd." [a $ and ? of 

 which labelled " Arctic America — Rapids of the Drowned. June 

 30th, 1892 (Taylor)," are practically indistinguishable from Finmark 

 specimens] . Scudder's tables (op. cit., pp. 344-6) are most interesting, 

 and are three in number, viz., (1) A table to determine the $ s drawn 

 from the ornamentation of the wings. (2) A table to determine the 

 $ s drawn from the ornamentation of the wings. (3) A table to 

 determine the $ s drawn from the abdominal appendages. These 

 tabulations, so far as they relate to the forms of U. comma, read as 

 follows : — 



Table to determine the males of the Neaectic forms of U. comma ; drawn 



FROM THE ORNAMENTATION OF THE WINGS : 



1. Uppersurface of hindwing almost wholly tawny, with a very 



narrow dusky, or dark brown border . . . . . . 2. 



1. Uppersurface of bindwings largely obscured with dusky, or with 



a very broad dusky or dark brown border . . . . . . 3. 



2. Less than 36mm. in expanse; undersurface of hindwing 



distinctly marked with an irregular mesial band of 



partially connected spots . . . . . . . . nevada. 



3. Discal dash of uppersurface of forewings followed, in the lower 



median and medio-submedian interspaces, by a narrow belt of , 7 . , 

 iii-.i K ' J sylvanoides 



blackish scales .. .. .. .. .. .. " \( i h' \ 



3. Discal dash of uppersurface of forewings not followed by any ' ' l '' 



row of dusky scales along its lower edge . . . . 4. 



4. Undersurface of hindwings with an irregular mesial 

 band, composed of distinct, large, squarish, nearly 

 uniform spots . . . . . . . . . . . . juba. 



4. Undersurface of hindwings with an irregular mesial band 

 composed of distinct, small or rather small, spots, 

 seldom uniform . . . . . . . . . . . . 5. 



5. Band crossing undersurface of hindwings bent at an angle of 50°, 



the band much constricted near the angle . . . . . . Colorado. 



5. Band crossing undersurface of hindwings bent at an angle of 60° 

 to 75°, the spots near the angle only a little, if any, smaller 

 than the others . . . . . . . . . . . . 6. 



6. Each of the spots forming the mesial band of the under- 

 surface of the hindwings distinct, often narrowly 

 edged on the outer and inner edges with black, the 

 ground of the wing almost always rather heavily 

 flecked with dark green . . . . . . . . . . comma. 



6. The spots of the mesial band of the undersurface of the 

 hindwings confluent, or nearly so, almost never and 

 then but slightly edged with black, the ground of the 

 wing but slightly flecked with not very dark green . . manitoba. 



Table to determine the females of the Neaectic forms of U. comma; drawn 



FROM THE ORNAMENTATION OF THE WINGS : 



1. The paler markings of the undersurface of the wings, white or 



silvery- white, conspicuous . . . . . . . . . . 3. 



3. Forewings with semi-hyaline spots in the median interspaces . . 1 y , an ?\ ^ s 



3. Wings without trace of hyaline spots . . . . . . . . 4. 



4. Ground colour of undersurface of hindwings greyish- 

 green . . . . . . . . . . . . . . 5. 



4. Ground colour of undersurface of hindwings olive or 



yellow-green . . . . . . . . . . 6. 



5. A large species ; markings on undersurface of forewings, below 

 the middle median nervure, generally very ill-defined ; hind- 

 wings slightly but distinctly produced next the inner portion 

 of the outer margin ; band of undersurface of hindwings 

 broad and usually connected ; inner area of same surface 



