A CHAPTER ON ZYG^NA MINOS. 55 



which make it doubtful whether Keferstein had the true 

 Pluto (with which T am likewise unacquainted) before him. 

 Ochsenheimer speaks of a more slender antennal club, and 

 broader, more rounded wings, — thus of things in which Z. 

 Minos shows no such variability ; and before one could 

 maintain that Ochsenheimer had exaggerated, it would be 

 necessary to see original specimens of Zi/g(Ena Pluto, 



Boisduval also formerly was anxious to unite Z. Pluto 

 'and Z. Minos; but according to his new Index (in which 

 Z. Pluto is introduced at an unsuitable place) he has revoked 

 this opinion. The Z. Pluto of his Monograph may be 

 identical with that of Ochsenheimer ; the figure is certainh^, 

 like most of those in the Monograph, bad enough, so that it 

 furnishes little information ; but in the description all Och- 

 senheimer's distinctive characters are repeated, whence there 

 seems little reason against the identity of his and Ochsen- 

 heimer's Z. Pluto. 



But Zt/gcsna Pluto of the Icones (tab. 52, fig. 4) is quite 

 another creature, wherefore also the characters sound very 

 anomalous. Difference in the form of the wings and antennae 

 is no more the question ; the securiform spot of the anterior 

 wings is rounded, and even larger than in the next figure of 

 Zygcena Minos (fig. 5) ; in short, Boisduval had had a Z. 

 Minos before him, and erred in his references. 



From Professor Hering I have received a male Zi/gcena 

 for determination, which was sent him by Frivaldsky as Z. 

 Pluto. Two males, of unknown locality, which agree spe- 

 cifically therewith, were received by me from Vienna. Only 

 Hering's specimen shows the hind margin of the anterior 

 wings externally more convex than in Zi/gcena Minos ; 

 otherwise they agree entirely with that species, except, firstly, 

 that the middle spot is much further from the hinder margin, 

 and seems abbreviated, and, secondly, that the posterior 



