202 ENTOMOLOGY 
son—in other words, may be seasonally dimorphic, trimorphic 
or polymorphic. 
Thus Polygoma interrogationis has two forms, fabricii and 
umbrosa, which differ not only in coloration, but even in the 
form of the wings and the genitalia. In New England fabricii 
hibernates and produces wmbrosa, as a rule, while wmbrosa 
usually yields fabricit. 
The little blue butterfly, Cyaniris pseudargiolus (Fig. 231), 
is polymorphic to a remarkable degree. In the high latitudes 
of Canada, a single brood (lucia) occurs. About Boston, the 
same spring brood appears, but under two forms: an earlier 
variety (lucia), which is small, with large black markings 
Cyaniris pseudargiolus; A, form lucia; B, violacea; C, pseudargiolus proper. 
Natural size. 
beneath; and a later variety (wviolacea), which is typically 
larger, with smaller black spots, though it varies into the form 
lucia. Finally, in summer, a third form (pseudargiolus 
proper) appears, as the product of lucia or else the joint prod- 
uct of lucia and violacea, and this is still larger, but the black 
spots are now faint. In the warm South, the spring form is 
violacea, but while some of the males are blue, others are 
melanic, as just mentioned—a dimorphic condition which does 
not occur in the North. Vvolacea then produces pseudargi- 
olus, in which, however, all the males are blue. 
Tphiclides ajax (Fig. 232) is another polymorphic butterfly 
whose life history is complex. ‘The three principal varieties 
of this species, known respectively as marcellus, telamonides 
and ajax, differ not only in coloration, but also in size and 
form; marcellus appears first, in spring; telamonides appears 
