1898.] GROTE — SPECIALIZATIONS OF LEPIDOPTEROUS WING. 43 



Explanation of Plate II. 



The figures are obtained by a combined photographic process. The veins are 

 numbered according to the system Redtenbacher-Comstock. 

 iii = radius, iv = media, v = cubitus. 



Fig. 8. Eurymtis ediisa. Attention is called to the slipping forward of iiij. If 

 a comparison is made with my figure of Euryi7ius hyale (/. c. Fig. 7) 

 it will be found that in this type of the genus the distance traversed 

 by this vein along radius is slightly greater than in edusa, which is 

 so far the more generalized form. A specialized type. 



Fig. 9. Meganostoma ccesojiia. Type of genus. Attention is called to the 

 remains of i on secondary wings. On primary wing vein \\\^ halts 

 opposite cross-vein. A subspecialized type on the direct line to Eury- 

 mus. Mr. Scudder prefers zerene for this genus. 



Fig. 10. Callidryas eubule. Type of genus. A generalized four-branched 

 type. Vein iii2 in original position. 



Fig. II. Nymphalis lucilla. Type of family, subfamily and genus. Vein iii^ 

 given off upon external margin. Attention is called to the gener- 

 alized state of the radius, common to all brush-footed butterflies. Also 

 to the specialized condition of the median branches, which have 

 joined the radial and cubital systems respectively. The cross-vein 

 has vanished and the media, as a system, has virtually disappeared 

 from the wing. Veins ii and iii on hind wings absorbed to point of 

 issue of i. 



Fig. 12. Para7'ge cegeria. Type of genus and subfamily. Attention is called 

 to position of cross-vein on hind wings and to the fact that ivg has 

 joined cubitus. Compare with the following figure in this respect. 



Fig.1^13, Agapetes galathea<^ . Type of genus, subfamily and family. A more 

 generalized type than the preceding. The lower branch of media, 

 vein ivg, arises from cross-vein and is not permanently joined to the 

 cubital system. 



