138 THE COMMONER BUTTERFLIES. 



and of a yellowish-green color, are laid singly (but often 

 many upon the same branch) on the leaves of Cassia and 

 usually upon the under side; they hatch in two or three 

 days. The cater23illars eat first the extreme leaflets of the 

 Cassia, beginning at the tip of the leaf; the chrysalis hangs 

 from five to eight days. As the larval stages are passed 

 rapidly, at least in midsummer, it is possible that the 

 broods may be much more numerous than stated above; 

 but if so, the striking accession to the numbers in flight in 

 August remains to be explained. 



38. Genus Eurema, 

 EUREMA LISA— THE LITTLE SULPHUR. 



(Xanthidia lisa, Terias lisa.) 



Butterfly. — Upper surface of wings canary-yellow, the apex 

 and whole outer margin (the latter not quite to the outer angle 

 in the female) broadly bordered with blackish brown on the fore 

 wings ; hind wings rather narrowly margined with the same in 

 the male, with a large spot at the upper angle only in the female. 

 Under surface duller yellow, sparsely sprinkled with brownish 

 dots, especially on the hind wings, which are more or less flecked 

 with ferruginous and have also a ferruginous spot in both sexes 

 opposite the blackish spot of the upper surface of the female. 

 Expanse 1^ inches. 



Caterpillar. — Head grass-green, the white papillae moderately 

 high and not numerous. Body naked, pilose, the white papillae 

 not in transverse lines ; color grass-green, deepening in color 

 down the sides, with a white stigmatal line. Length more than 

 f inch. 



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

 protuberant ; frontal horn slender, conical ; translucent green, 

 sparsely dotted with blackish. Length | inch. 



The distribution of this butterfly is almost precisely that 

 of the preceding species, but it has been found in the East 

 a little farther north than it, having apparently a permanent 

 foothold on the southern shores of New England. Probably 



