26 GROTE—-THE DESCENT OF THE PIERIDS. [Jan. 5, 
The neuration of AHedomora is Pierid, not Anthocharid ; the orna- 
mentation of the wings above resembles on the other hand that of 
Eroessa, but also Callosune. I cannot see in the neuration any 
sure indication that it is related to the ‘‘ Yellows.’’ Probably all 
the generalized forms tend to meet, but I have found no compre- 
hensive type in my material which might stand as ancestral to the 
whole. 
A line which runs parallel with P¢erzs, and which is character- 
ized by the opaque veins, strong wings, the two first radial branches 
in original position above the cell, the humeral spur of secondaries 
turned outwardly except in AZesagia, where it is truncate, and which 
possibly may connect with the main line through Préoneris, may 
now be taken up. 
Gen. Mesapia Gray, 1856. 
Type: M. peloria. 
Mesapia peloria. 
A miniature edition of Aforza. Veins strong, cells closed. 2 
more separate from 1 and avery little nearer end of cell; the 
costal field above cell is wider on primaries, the cell a little more 
central than in Aforza. On secondaries humeral spur straight and 
truncate. Seemsa slightly more specialized form than Ajorta, with 
which it generally coincides even to the fraying of the cross-vein 
superiorly between 172 and J on fore wings. On the hind wings 
the veins appear more equidistant, d/1 is further removed from R 
than in Aforza. A rare form from Thibet. 
Gen. Aporta Hiibner, 1816. 
Type: A. cratzgi. 
Aporia crategt. Grote, Mitt. a. d. Roem. Mus., 8, Taf. i, Fig. 6 
(neuration). 
Wings strong, entire veins opaque, cells closed. Radius four- 
branched ; Ar and £2 in original position above cell, but 2 
removed a little outwardly. Jd/1 from radius, well removed from 
cross-vein ; the branchlet #3 longer than in Prerz7s. Second anal 
vein with a slender fork at base. Hind wings with humeral spur 
abbreviate, turned outwardly. A common European form. 
