lord 
1900.) GROTE—THE DESCENT OF THE PIERIDS. Li 
Gen. Hnantia Hiibner, 1816. 
Type: E.. melite: 
Lnantia melite (L.). 
Radius five-branched, all branches arising beyond cell, but com- 
pared with Zepfals, the first radial is less advanced, much nearer 
cross-vein, hence in a more generalized condition. 1, angulate, 
fusing with subcostal. Cell closed, concave; 4/1, from cross-vein 
close to radius; J/2, cubital. Hind wings with hardly abbreviate, 
somewhat pointed costal, turning well to base of wing; no trace of 
subcostal cell. First median branchlet has left cross-vein and arises 
from radius at somewhat less than one-third of its length from cross- 
vein to external margin. Cell closed; JZ2 cubital. 
This form is more generalized than Leptalis. Mr. Scudder takes 
Zicinia as the type of Lxantia, but, for several reasons, I follow Mr. 
Kirby here. 
Gen. Acmepteron God. and Salv. 
Type: A. nemesis. 
Acmepteron nemests (Latr.). 
Radius five-branched, all the branches arising beyond discal 
cell; Az fusing with subcostal vein. Cell closed ; cross-vein me- 
dially concave ; AZ arising much before upper angle from cross- 
vein, hence this genus is more generalized than Euantia; Ma, 
cubital; from the concave portion of cross-vein a strong back- 
ward spur arises, the relic of base of the median system. Hind 
wings with humeral spur straight, truncate; cell closed, with 
Mi arising at upper extremity of cross-vein, hence much general- 
ized. 
This genus comes nearest to the primitive type of the subfamily, 
being more generalized than any examined by me. There isa dif- 
ference in the degree of sinuosity of the second anal vein, which is 
much bent in Acmepteron, but which I have not been able to pre- 
cise. In this form also I believe to have detected a very faint linear 
scar at base of second anal, and which I cannot make out in the 
other genera of the family. It would occur naturally in a general- 
ized form, but, as I have said elsewhere, the detection of the scar, 
when faded, is quite difficult and depends on the light in which the 
tegument is viewed. 
PROC. AMER. PHILOS. SOC, XxxIX. 161. B. PRINTED MARCH 18, 1900. 
