50 FOSSIL BUTTERFLIES. 



den bciden Mitteladern geschlossen ist oder nicht, war mir nicht moglich zu ermit- 

 teln; bei guter Bcleuehtung glaubte ich dort einen schwachen Queroindruck zu se- 

 hen, der als Yerbindungsast zu deuton ware; jedenftills ware derselbe aber fuisserst 

 zart, viel zarter als die librigen doutlichen Adern. Die aussere Mittelader scndet 4 

 Aeste aus, der erste entspringt nahe der Fliigelbasis uiid lauft nach dem Anssen- 

 rande, die drei folgenden entspringen naher flugelspitzwarts. Die v. interno-media 

 zerspaltet sich in 3 Aeste, ganz so wie die des Oberfltigels, welche auch in gleicher 

 "Weise verlaufen. Alle 3 Aeste sind fast gleich weit von einander entfernt und 

 entspringen nicht von einem Punkt. Die vena analis zerspaltet sioh bald nach 

 ihrem Ursprung in zwei Gabelaste, welche nach aussen laufen. Die Farbe des 

 Flugels ist ein belles Gi'aubraun. 



As far as the neuration is concerned (excepting that of the costal nei-vui'e, 

 which is certainly incorrectly rendered, and does not accord with the description) 

 it agrees sufficiently with the general neuration of Mylothi'is' to suppose it may 

 belong to the allied genus Mylothrites, but that it can belong to M. Pluto is 



exceedingly improbable, as one may judge by tracing the 

 probable extent of the broken hind wing, and placing the 

 tracing in juxtaposition with the fore wing of Pluto, as in 

 the accompanying woodcut (fig. 1) ; for it must be remem- 

 bered that in all the genera of this subfamily, the cell 

 extends at least to the middle of the wing; the hind wing 



^ " of M. Pluto must, therefore, have certainly been fully one- 



"*■'' sixth longer than the wing conjectured to belong to it; 



Fig. 1. The ilolted outer border of 



the bind wing repicscnu the proba- SO great a difference is at least unusual among: indi- 



ble limit of the (Jratz fossil. The ° 



probable"" toB of'lhl wnri^ng'tf viduals of the same species in this group; moreover, the 

 uyiothrue. Pluto. uBuratlon is not quite what we should expect, although 



the appearance of veins on the drawing we have reproduced must be in pai-t 

 due to extraneous causes; we will, therefore, make no attempt to decipher the 

 present condition of the fossil, trusting that some of the Austrian lepidopterists 

 will give the subject early attention. 



A study of the original description and illustration of the front wing of this 

 butterfly leads me to the conclusion that the description of the neuration of 



> Compare the illustrations referred to in the note on page i4. 



