50 FOSSIL BUTTERFLIES. 



den beiden Mitteladern gesehlossen 1st oder nicht, war mir nicht moghch zn ermit- 

 tcln; bei guter Beleuchtung glaubte ich dort einen sehwachcn Quereindruck zu se- 

 hen, der als Verbindungsast zu dcuten ware; jedenfalls ware dcrsclbc aber ansserst 

 zart, viel zarter als die iibrigen doutlic-bcn Adern. Die aussere Mittelader sendet 4 

 Aeste aus, der erste entspringt nahe der Fliigelbasis und lauft nach dem Aussen- 

 rande, die drei folgenden entspriugen naher fltigelspitzwarts. Die v. interno-media 

 zerspaltet sich in 3 Aeste, ganz so wie die des Oberlliigels, welclic auch in gleicher 

 "Weisc verlaufen. Alle 3 Aeste sind last gleich weit von einander entfernt und 

 entspringen nicht von einem Punkt. Die vena analis zerspaltet sieh bald nacli 

 ih rein Ursprung in zwei Gabeliiste, welche nach aussen lanfen. Die Farbe des 

 Fliigels ist ein hellos Graubraun. 



As far as the neuration is concerned (excepting that of the costal nervure, 

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

 it agrees sufficiently with the general neuration of Mylothris 1 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 dotted outer border of 



II, hind wing represents the proba- SO gl'Cat a difference IS at least UllUSUal aillOllg llldl- 

 lil limit of the Gratz fossil. Tin.- 

 bioken outer border indicates the yldlials of tllC SaillC Species ill this gl'Ollp ; moreover, tllC 



in .liable t^ize of the hind wing of 



neuration is not quite what we should expect, although 



the appearance of veins on the drawing we have reproduced must be in part 

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

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

 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 



1 Compare the illustration* referred I" in I In- imie on page 44. 



