32 GROTE—THE DESCENT OF THE PIERIDS. [Jan. 5, 
Gen. ZLeucidia Boisduval, 1847. 
; Type: L. elvina. 
Leucidia elvina. 
Wings frail, short, entire; discal cells wide, taking up about half 
of the length from base; radius four-branched ; Ax in original 
position ; #2 has advanced greatly, arising beyond cross-vein at 
about one-fourth of distance to external margin; 3 a short fur- 
cation with R4 + 5. Discal cell closed ; 4/2 nearly central. Fork 
to second anal at base apparent. Hind wings with truncate straight 
humeral spur; J/1 out of radius beyond cross-vein; J/2 nearly 
central. 
More generalized than Zeftosta by the four-branched radius and 
equally unrelated to Leptidia. ‘This species is very light yellow 
with dark apices of four wings. 
Leucidia brephos. 
This is one of the frailest of small butterflies; pure white, the 
neuration agreeing absolutely with the type, unless it is that the 
humeral spur is a little shorter, truncated. 
This exhausts my material in the Ascza direction and we will now 
return to more specialized types of the line Prerts-Aporia. 
Piccarda n. gen. 
Type: P. eucharis Drury, sp. 
Piccarda eucharis. . 
Wings ample. Radius three-branched; 1 from above cell in 
original position; 2 a short fork out of 3-5 before apices. 
Cell closed, vein between J/2 and JZ hardly degenerate; A/2 
radial ; 4/1 from lower side of radius, a little less than one-third 
of distance between cross-vein and external margin. Second anal 
with basal fork. Hind wings with hardly abbreviate, pointed, 
outwardly curved humeral spur; cell closed, vein a little more 
degenerate than on fore wings ; Sc. apparently solid at base. 
This genus differs from DeZas, than which it is more specialized, 
by the position of 4/1, which is about one-third removed from dis- 
cal cell. 
Piccarda hyparethe Linné, sp. 
Agrees with eucharis, the stem of Jf very slightly shorter, hence 
more generalized. There are probably other Asiatic species to. be 
separated from Defias upon the above character. 
