SEASONAL CHANGES AND HISTORIES. 



153 



derii), closely allied to these, and an insect hardly 

 known south of the Canadian border, is double- 

 brooded. Our Chequered White (Pontia Proto- 



FIG. 135. Pontia Protodice, male, nat. size (Kiley). 



dice) [Figs. 135, 136] is triple-brooded, and the 

 European Bath White (P. Daplidice) only double- 

 brooded, while our common Clouded and Orange 

 Sulphurs (Eurymus Philodice and E. Eurytheme) 



FIG. 136. Ponlia Pro'odice, female, nat. size (Eiley). 



[see Figs. 102, 103] are triple-brooded in the 

 north, perhaps polygoneutic farther south, and 

 the closely allied European species only single or 

 double brooded. 



