190 BUTTERFLIES 



develop generation after generation without any break in 

 the sequence. As the species goes north, however, there 

 is necessarily such an interruption — in which case the 

 winter seems commonly to be passed by the adult butter- 

 fly. In our Southern states there are commonly three or 

 four broods each year, while in the northern parts of its 

 range there is but one brood a year. In the South there is 

 such an overlapping that all stages of the insect may be 

 found at one time. 



Synopsis of the Angle-wings 

 I. The Polygonias 



The most angular of the Angle-wings are grouped in the 

 genus Polygonia. They are characterized by having the 

 outer margin of the front wings projecting in two places in 

 a way to give an angular effect, and by having the hind or 

 inner margin distinctly excised toward the outer end, so 

 that this margin is curved rather than straight. 



Violet-tip (Polygonia interrogatio7iis or Grapta interro- 

 gationis). Expanse 2^ inches. Under surface of each 

 hind wing marked by a silvery semicolon, made up of a dot 

 and a crescent. 



Hop Merchant {Polygonia comma or Grapta comma). 

 Expanse 2 inches. A white comma with expanded tips on 

 lower surface of each hind wing. Lower surface of all the 

 wings mottled with brown. 



Green Comma {Poly goniaf annus or Grapta f annus) . Ex- 

 panse 2 inches. A white comma with expanded tips on 

 lower surface of each hind wing. The lower surface of all 

 the wings more or less mottled with green toward the 

 margins 



