38 GROTE—THE DESCENT OF THE PIERIDS. |Jan. 5, 
alike, hence there has been an independent advance in the pattern 
of the male. 
An analagous difficulty with that in the case of Pyrrhybris and 
Delias prevents us from considering that /Veophasia is related to 
Cunizza ; since in Veophasia the media has progressed and not in 
Cunizza, where A/r still springs from the cross-vein. But it seems 
possible that Pyzvhybris may be looked upon as a specialization of 
a type similar to Weophasia. 
The Angled Whites. 
(Anthocharint.) 
Of the group here discussed, all the types, from the three- to the 
five-branched form, are, if we admit Pont/a, here extant, and the 
evolution of the specialized forms may have been relatively modern. 
The wings have somewhat sharp apices and often a perceptible 
sexual distinction in shape, the outer margin retreating in the males. 
The size is moderate, the ground color white, often with orange 
blotches in the male, the secondaries marbled beneath with lichen 
green. ‘The specializations of the neuration run parallel with the 
Pieris branch; in one line the second radial branch remains in the 
original position, in the other it travels up the vein as it does in 
Trifurcula. The cells are closed; the transparent veins seldom 
degenerate. Humeral spur of secondaries turned toward base of 
wing or abbreviate and straight, except in Poniia. 
Gen. Pontia Fabr., 1807. 
Type: P. daplidice. 
Pontia daplidice. Proc. AM. PHIL. Soc., xxxvii, Pl. i, Figs 
(neuration). 
A specialized form, with three-branched radius. I have discussed 
(2. ¢., 35) what I believe has been hitherto overlooked, the fact that 
this butterfly possibly belongs to the present series, and that its 
resemblance to Pzer?s (than whichit is more specialized) is mainly 
due to convergence. ‘Thesecond radial arises before the cross-vein, 
hence it would represent a culmination of the direct line from 
Luchloe. ‘The humeral spur of secondaries turns outwardly as in 
Pieris, and this feature may ultimately prove me to be wrong. 
With regard to the use of this generic title, Mr. Scudder says: 
‘‘Curtis, Brit. Hnt., Pl. 48, designates (in 1824) daplidice as the 
