42 GROTE — SPECIALIZATIONS OF LEPIDOPTEROUS WING. [Jan. 21, 



Explanation of Plate I. 



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

 numbered according to the system Redtenbacher-Comstock, 

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



Fig. I. Pontia daplidice. Type of genus. Attention is called to the three- 

 branched radius. A specialized type. Vein iiig in original position. 



Fig. 2. Tetracharis cethura. Type of genus. Compare the four-branched 

 radius with the five-branched radius of Euchloe. Vein \\\^ in original 

 position. 



Fig. 3. Anthocharis ausonides. Vein iii2 has moved forward to a point con- 

 siderably beyond the cross-vein. Attention is called to the dimin- 

 ished extent of vein iii^. A more specialized form than A. belemia. 

 For this type Mr, Scudder uses Synchloe, but contrary to custom. 

 The reason for rejecting Midea for genutia does not seem to me 

 tenable. 



Fig. 4. Euchloe cardamines. Type of genus. The five-branched radius 

 shows vein \\\^ in original position above the cell. E. stella agrees. 

 A generalized type of the group. 



Fig. 5. Nathalis iole. Type of genus. A specialized type with three- 

 branched radius. 



Fig. 6. Terias hecabe. Type of genus. A subspecialized type with four- 

 branched radius. Vein viii of primaries fairly distinct. A mere 

 rudiment of vein i of hind wings. 



Fig. 7. Gonophlebia paradoxa. Type of genus. Vein viii of primaries pres- 

 ent, short, close to vii. On secondaries three internal veins. Type 

 of subfamily Gonophlebianue. Compare text. 



