THE CANADIAN ENTOMOLOGIST. 153 



some on all the tibiae, in others on the middle and posterior ones, or on 

 the middle tibiae alone. Not less are there all degrees of transition 

 apparent, from the feeblest and least perceptible, to those with the long 

 and stout spines. In order to understand that no natural division can be 

 based upon such differences as these, one needs only to place those with- 

 out the spined tibiae in comparison with the others. The same value 

 must be placed upon the stigma of the fore wings of the male ; it is 

 present in the greater number of the species, at least in the typical (Div. 

 A), but even in a few of these it is wanting, which in other respects do 

 not differ. Perhaps the neuration of the wings supplies better points of 

 support for the division of those species here united into natural genera. 

 The different origin of the first branch of the median vein of the fore 

 wings does not offer available characters because it does not yield sharp 

 limitations. While in some species ( Afat/iias, Zelleri, Inachus) the trunk 

 and first branch of this vein have the same length, the point of departure 

 of the latter in others ( Nostrodamus, Osyka Edw.) is nearer the base, and 

 thus forms a transition to the normal form in about one-third of the length 

 of the wings. Whether the origin of the discoidal vein of the fore wings 

 yields a sufficient characteristic for a true genus Pamphila, as Felder sup- 

 poses ( Wien. Ent. Monatschr. 1862, p. 483), I have not ascertained. 



Scudder ( Syst. Revis. of American Butterflies) has separated the here 

 included species into numerous genera, but unfortunately has not supplied 

 diagnoses ; and from the list of the species alone, the grounds for this 

 separation do not become clearly evident. 



The single species of Division B, Alcides HS., deviates from all the 

 others here united, in the rounded tip of the antennas, and should there- 

 fore, strictly speaking, be separated, since the acute tip of the apical 

 hooklet of the club is an essential character of the genus. Besides that, it 

 has another peculiarity. According to Herrich-Schaeffer's statement 

 (System. Bearb. d. Schmett. v. Eur., vi , $S), the male of this species has 

 only 2 spurs on the hind tibiae ( °. 4, as usual). Lederer ( Wien. Ent. 

 Monatschr., 1857, 79) remarks concerning it : " In the male in my collec- 

 tion (with the female, probably the originals of Herrich-Schaeffer's 

 descriptions and figures) I observe distinctly only 3 spurs, the fourth may 

 have been broken off." I have examined 3 males and r female. Two 

 flown males (Amasia, Staudgr.) have only end spurs, but of the middle 

 spurs not a vestige is to be seen ; in the third male (Magnesia, Bed., from 

 Mceschler's collection) both middle spurs are present, but unusually 



