FAMILY TYPICAL BUTTERFLIES. 139 



triple-brooded in the South, it seems within our district to 

 be only double-brooded, and probably hibernates every- 

 where as a butterfly. In the North the first brood of fresh 

 butterflies appears about the middle of June and flies for 

 five or six weeks; the second and much more numerous 

 brood appears early in August, receives accessions through- 

 out the month, and flies through September. The eggs, 

 which are light green, slender fusiform, and with very 

 numerous vertical ribs, are laid singly on the upper side of 

 the midrib between the leaflets of Cassia, species with 

 small and finely-divided leaflets being preferred, and hatch 

 in five or six days. The caterpillar escapes from the side 

 of the Qgg, and generally devours a considerable part of the 

 rest before touching the leaves, when it crawls to the under 

 surface and remains there, at first eating only holes in the 

 leaf so as to leave the skeleton of the leaf untouched; it 

 rests on the midrib of the leaf or on the stalk, and is then 

 difficult to detect, so closely does its color accord with that 

 of the plant; if much disturbed it will drop from the leaf 

 by a thread. In the autumn the chrysalids hang for a 

 month. 



An immense swarm of these delicate butterflies, thou- 

 sands in number, was once blown like a cloud to Bermuda 

 from the mainland, fully six hundred miles away. 



39. Genus Nathalis. 



NATHALIS lOLE— THE DAINTY SULPHUR. 



(Xathahs Irene.) 



Butterfly. — Wings pale canary-yellow with dark brown mark- 

 ings, which, on the upper surface of the fore wings, consist of a 

 large apical spot bounded by an obHque line connecting the 

 costal and outer margins near their middle, and a broad bar 

 along the inner margin, not reaching the outer margin ; this 

 bar is repeated on the under surface accompanied by a couple of 

 blackish spots above its outer extremity ; under surface of the 



