GROTE—THE DESCENT OF THE PIERIDS. 21 
Gen. MWZetaporia Butler, 1870. 
Type: M. agathon. 
Metaporia agathon. 
Closely allied to Aorta, but the first and second radial branch- 
lets are quite in original position, Az further from the cross-vein, 
hence more generalized than Aforta. On hind wings humeral spur 
straight, truncated. 
Dr. Staudinger catalogues under MMefaporia a number of rare 
palzarctic forms which I have not been able to study, and which 
may not be congeneric with agathon, which the same author refers 
to Previs. 
Gen. Prioneris Wallace, 1867. 
; Type: P-thestylis. 
Prioneris thestylis. 
Wings ample, entire, veins opaque, tending to subtransparency. 
Radius four branched ; A1 and #2 near together, well removed 
within cell, #3 a moderate fork. Cells closed ; J/t ascends radius 
for about one-fourth of distance between cross-vein and external 
margin. Hind wings with humeral spur pointed, turned to apices 
of wing. Cross-vein, between J/2z and cubitus, strongly convex 
with 4/3 nearly centrally placed, springing from apex of convex- 
ity; traces of a splitting of subcostal vein at base. 
This genus is more generalized than MJe¢aporia by the two first 
radial branchlets being less outwardly removed ; the first median 
has ascended radius for a shorter space; on hind wings J/2 is 
more central, continuous with cross-vein. It is more specialized 
than Hobomoia, by the ascent of radius by 4/1. On both wings 
M2 is continuous with upper portion of discal cross-vein, which 
latter, between 1/2 and M3, is slightly reduced. 
We will now leave Pver’s and its branch Aforia and seek for 
other parallel series of forms. The following line may not be con- 
tinuous. I arrange the genera according to their grade of special- 
ization. 
Gen. Elodina Felder, 1865. 
Type: E. egnatia. 
LElodina egnatia. 
Wings entire; radius specialized, three-branched ; #2 has left 
the discal cell and progressed beyond the cross vein, being inter- 
mediate between Ar and R3 + 4-++ 5, the latter a long fork with 
