134 THE COMMONER BUTTERFLIES. 



and Kansas. The eggs, which are thick fusiform, with 

 about eighteen low vertical ribs and yellow-green in color, 

 are laid singly on the under side of the tender end-leaflets 

 of Amorpha and hatch in about four days. The chrysalis 

 hangs from seven to thirteen days. The butterfly is 

 apparently at least double-brooded and shows some indi- 

 cations of seasonal dimorphism, the later brood or broods 

 having much more roseate on the under surface than the 

 earliest. It is on the wing during every month from April 

 to November, but much is still to be learned of its exact 

 life-history. 



36. Genus Eurymus. 



EURYMUS PHILODICE— THE CLOUDED SULPHUR. 



(Colias philodice, Zerene antbyale.) 



Butterfly. — Upper surface of wings yellow, the fore wings with 

 a broad, blackish brown outer margin, incurved at the extremi- 

 ties (and in the female broken by yellow spots), together with a 

 small black spot at the tip of the cell; hind wings with a similar 

 border narrowing at the extremities and in the female much 

 narrower and less pure than in the male, in addition to which is 

 a pale orange circular spot at the tip of the cell. Under surface 

 sulphur-yellow, the spots at the tip of the cells repeated, on the 

 fore wings black with a transverse white dash in the centre, on the 

 hind wings ferruginous with a large silver j^upil and sometimes 

 accompanied above by a similar satellite. Expanse about 2 

 inches. 



Caterpillar. — Head grass-green with white dots. Body naked, 

 pilose, grass-green, with a faint darker dorsal line and a pale 

 roseate stigmatal band, usually bordered beneath in the middle 

 of most of the segments wdth velvety black; whole body covered 

 with raised points. Length more than 1 inch. 



Chrysalis. — Body not bent in the middle, the wing-cases but 

 little protuberant; frontal horn short conical, the colors on either 

 side of its lateral ridge similar; color of body grass- green, ver- 

 miculate with yellowish white, with a narrow yellowish stigmatal 

 stripe. Length f inch. 



