PAMrillLIDI: ERYNNIS SASSACUS. 1645 



Its habits are nut specially cleanly as in most other skippers, for it soils 

 its own nest considerably. 



Life history. Tiie insect in single brooded in the north, double brooded 

 in the soutii, jirubably passing the winter as a chrysalis. In the south, 

 the butterfly appears by the middle of April and again at the end of 

 August, after ten days passed in the pupa (Abbot). 



In Xew England it is one of the earliest of the Pampliilidi, the earliest 

 butterflies being seen during tlic last week in May, the female scarcely later 

 tlian the male ; sometimes they are not seen before the middle or latter part 

 of the first week of June, but they are generally out by this time in the 

 northernmost limit of their range and they evidently continue to emerge 

 from the chrysalis until the middle of the month and remain on the wing 

 throuffh this month ; sometimes battered individuals may be found until 

 the middle of July. The female begins to lay eggs by about the 10th of 

 June; these hatch in from twelve to fifteen days, but the further history 

 of the caterpillar has not been traced, excepting that some I had remained 

 in this stage until past the middle of July. 



The butterfly frequents fields and meadows. 



Desiderata. The exact distribution of this butterfly outside of New- 

 England and the completion of its history after it has left the egg are the 

 principal desiderata in our knowledge ; the parasites of the insect and the 

 flight and postures of the butterfly are yet undescribed, and we do not 

 know how the winter is passed. 



LIST OF ILLUSTRATIONS.— ERYNNIS SASSACUS. 



Egg. PI. 37, figs. 14, 20. Male abdomiual appendages. 



PI,66, fig. 19. Plain. 42:10. Xeuiatiou. 



23. Outline. 43:15. Discalstigmaof fore wing of male. 



69 : 12. Micropyle. 45 : 1. The same, greatly enlarged. 



Caterpillar. 49:1. Scales of the discal stigma. 



PI. 73, fig. 7. Caterpillar at birth. 59:8. Side view of head and appendages 



Imago. enlarged, with details of leg structure. 



PI. 10, fig. 13. Female, upper surface. General. 



16. Male, both surfaces. PI. 30, fig. 5. Distribution in North America. 



