42 GROTE—THE DESCENT OF THE PIERIDS. |Jan. 5. 
Gen. Lroessa Doubleday, 1847. 
Type: E. chilensis. 
Eroessa chilensis. 
Radius five-branched ; second radial in original position above 
the cell. The first median branchlet has not ascended the radius, 
but is thrown off from the discal cross-vein. Hence this form is 
more generalized than all the preceding. It represents quite 
surely an ancestral form of Huchloe, in which latter 4/71 ascends 
radius. Cells closed; second anal of fore wings sinuate ; fork 
present. Humeral spur of hind wings abbreviate. Outer margin 
of wings uneven, slightly scalloped. ‘The plan of neuration accords 
with the Anthocharid type. On the whole this is one of the most 
generalized Pierids I have met with. 
In this group the humeral spur of secondaries is shortened and 
straight in all the forms examined except Anthocharis belemia and 
A. ansonides, in which it appears as if curved backwards to base of 
wing, and Pontia daplidice, in which it appears curved in the re- 
verse direction, toward the apex of the wing, and this is the direc- 
tion of Preris, Delias, etc. ‘This makes my reference of Ponta to 
this series doubtful. In any event, dapiidice is the type of a dis- 
tinct and more specialized genus than Pzerzs. It must be confessed 
that it is hardly possible to separate it neurationally from the J/Zan- 
cipium three-branched type. Alone the contour of the wing is An- 
thocharid ; there is a slight sexual difference in the primaries, the 
male wing seeming a little narrower and the anal angle of hind 
wings is more determinate than in Pzerzs. |The ornamentation is 
Anthocharid. I leave /Pontia here to draw attention to it. It 
would, indeed, make the group here discussed more homogeneous 
were we to transfer Pontia to the typical Pierid series; the types 
would be more ofa size. Again, in Pula, the costal vein of hind 
wings is turned to base of wing, the Anthocharid direction, while 
in Zrifurcu/a it is truncate or abbreviate, straight, as it is in many 
Anthocharids. In both genera the shape of the wings and orna- 
mentation are Pierid rather than Anthocharid, but this is more 
clearly the case with Phudra. 
The ‘* Yellows.”’ 
There are apparently two lines, as indicated by me in Proc. 
Am. Putt. Soc., January 1898, p. 38. In the non-typical line the 
wings are proportionately wide and frail, with less accentuated 
