20 ’ GROTE—THE DESCENT OF THE PIERIDS. [Jan. 5, 
mediate line of the typical genus Pierzs, | have commenced with 
the ‘‘ Whites ;’’ but since the lines probably really converge, it is 
not more correct than to begin with the ‘‘ Yellows.” 
Typical ‘‘Whites.”’ 
(Pieridini. ) 
Gen. Phulia H.-S., 1867. 
Type: P. nymphula. 
Phulia nymphula. Staudinger, /rzs, vil, Taf. i, Fig. 5 (neuration). 
Radius three-branched ; Ar and #2 before the cross-vein, R3—5 
to costa just before apex. Only the lower median branchlet 
from cross-vein ; d4/2 from lower side of radius not far from cross- 
vein; 73 a short furcation not far from apex. I cannot make 
out any trace of the fork to second anal; since this form is 
extraordinarily specialized by the ascension of the radius by dZ2 
(paralleled in Pseudopontia), its absence might be expected, yet 
I have so often found traces of it in the Pierididz where I thought 
it absent, that it may be finally detected here. Secondaries oblong 
ovate, humeral spur pronounced, turning to base of wing ; first 
and second median together from upper angle of discal cell. No 
traces of subcostal cell. 
From excellent figures of the neuration of species of Phudia given 
by Dr. Staudinger, /7zs, vii, Taf. i, Phulia nympha Staud. would be 
slightly more generalized by the propinquity of d/2 to the cross- 
vein (compare with Fig. 5 of nymphula). The species of Phulia, 
as well as the following Z7zfurcula, are Andean, flying at a height 
of 3000 to 5000 metres, department of La Paz, Bolivia. 
Gen. Zrifurcula Staud. 
Type: T. huanaco. 
Trifurcula huanaco. Staudinger, /rzs, vii, Taf. i, Fig. 7 (meuration). 
Radius four-branched ; #2 advanced to opposite discal cross- 
vein; #3 a very short furcation. #1, ascending radius; JdZ/2 
from cross-vein near to radius, so that the three veins are brought 
here close together, a feature which Staudinger considers charac- 
teristic. A very faint trace of fork to second anal. Hind wings 
shaped like Phufa; humeral spur straight, abbreviate; no trace of 
subcostal cell; JZ2 radial. 
_ More specialized than Pers by the advance of R2 to a point 
