40 GROTE—THE DESCENT OF THE PIERIDS. [Jan. 5, 
In PROCEEDINGS OF THE AMERICAN PHILOSOPHICAL SOCIETY, Janu- 
ary, 1899, I have suggested that the humeral spur is homologous 
with the shoulder veins of the Lachneidee. 
Gen. Anthocharis Boisd., 1836. 
Type: A. belemia. 
Anthocharts belemia. 
- 
Radius five-branched ; second radial arising opposite cross-vein 
in the Z7rifurcula position. #4 a short furcation. J/1 from 
radius about one-third the distance from cross-vein to external mar- 
gin. Humeral spur of hind wings continuous, pointed, turned to 
base of wing. Apices of primaries hardly produced and costa but 
slightly produced; external margin straight; anal angle of secon- 
daries determinate. This genus is an advance on the Huch/oe type 
by the attainment of the cross-vein by #2. 
Anthocharis belia. 
Quite similar to de/emia; R2 has progressed a little beyond 
cross-vein, hence more specialized than éde/eméa. Shape of wing 
the same. 
Anthocharis ausonides. Proc. AM. PuiL. Soc., xxxvii, Pl. i. Fig. 
4 (neuration). 
Quite similar to dea, again R2 seems a trifle advanced; 4 
still shorter, so that this form is the more specialized of the three. 
Shape of wing identical. 
Gen. Zegris Rambur, 1836. 
Type: 2. eupheme: 
Zegris eupheme. 
Radius five-branched ; second radial well removed to beyond 
cross-vein, thus abandoning and passing beyond the 7Z7</urcula 
position, which is assumed by Anthocharis. 1 takes up nearly 
the original position of #2. The apical portion of the wing is 
produced, and here the branches #3, A4, 5 with J/r are brought 
together ; J/1 having ascended the radius for nearly half the dis- 
tance between cross-vein and apices. The costa is strongly de- 
pressed ; external margin even; anal angle of secondaries more 
softened than usual. 
In the position of #2 this genus is more specialized than Axtho- 
charis or Trifurcula, but it falls behind the latter in which the 
