22 THE LEPIDOPTERIST 



Colias philodice God* f. nigrofasciata Reiff 



Plate III. 



Lepidoptera — Rhopaloc«ni 



By William Reiff, Jamaica Plain, Mass. 



The accompanying plate gives such an accurate 

 picture of the upperside of this interesting new form 

 that a detailed description may well be omitted. It is 

 a female specimen in which the yellow spots of the 

 marginal-band are completely extinguished through the 

 expansion of the black color and this color is extended 

 towards the black spot at the end of the discal-cell, 

 thus creating a confluention of the spot with the black 

 marginal area. All the other parts of the primaries 

 are covered with numerous black scales except a small 

 part above the inner margin, which has retained its 

 normal yellow color. The upperside of the secondaries 

 is normal. 



The underside diflfers from normal philodice as 

 follows: Upon the primaries the discal-cell and the 

 space between the veins are black which makes the 

 yellow color of the veins appear very distinct, a quite 

 similar arrangement as we see it in the female of 

 Pieris nap f. bryonise. However, the black color does 

 not reach to the margin but stops at the row of black 

 submarginal spots which we see in normal philodice 

 specimens. The secondaries are covered to two thirds 

 with reddish scales extending from the base of the 

 wings toward the row of reddish-brown submarginal 

 spots. The color of the scales increases the nearer they 

 are located to the submarginal spots. 



This beautiful new form was caught by Mr. Lewis 

 during August, 1916 in Massachusetts, and it is now 

 in the collection of the author. 



There is identically the same form as the one just 

 described in the palsearctic Colias hylae L. namely 

 f. nigrofasciata Brams. Since I believe that the forms 

 of all species of the same genus which diverge in 

 equal direction from the type should bear the same 

 collective name, I have named this new form of C. 

 philodice also f. nigrofasciata. 



