I.V( VKNINAK: INCISALIA IKUS. 841 



of tliein somoAvlmt \vi)rii. Sixty iiulivitlimls wcrr taki'ii in aljoiit tlircc lumr's collect- 

 liiK. Previous to 11 o'clock, iinicli llie liir^iter proportion of captures consisted of 

 females; subsequent to that liour, llie males were tlie more nunierons. On the 2r)th 

 they were still abniulnnt. .Imie 7tli and 'Jtli, a few much worn were seen; on the 15th 

 it was (il)scrvo(l fur llic last lime for the season, it bein-^ siiijjle broodeil. 



Habits. Qight and postures. According to Abbot tbc ImttcrHy tVc- 

 4uents tlie blossoms of tlio red l)U(l (Ccrcis caiiiulcnsis Linn. ) iu old fields 

 on the borders of swamps. Mr. II;im])ly noticed it in open spaces near 

 li>w pine trees ; but Mr. Lintncr, who has found it so abundant near 

 Albany, says it can be swept from its rest on the hot sandy road, though 

 "the nude was often taken while resting on bushes by the road side." 



In Hight it is ordinarily the least active of tlie Theclidi, for, though when 

 alarmed or aroused by the presence of a companion of its own kind it can 

 show as great activity as any, its ordinary movements, along the sandy 

 roads it loves to frequent, are ratiier sluggish than brisk and nervous, and 

 in keeping with tliis it hugs the ground or Hies just on a level with the 

 tops of the low whortleberries ; and even when disturbed rarely rises above 

 one's head. 



When quiet, the wings are elevated and closely appresscd ; the wings 

 arc very apt to be a little inclined, the bent j)ortion of the hind pair rest- 

 ing flat upon the ground. Like the other species of the genus, it rubs 

 the hind wings together, but when completely at rest, all the portion of 

 the fore wings below the lowest median nervule is concealed by the hind 

 wings. The antennae are straight, — excepting the vertical bend at the 

 base, — almost parallel with the body, but turned slightly downward and 

 divergent at an anfflc of about 100.° 



Desiderata. Our know-ledge of the distribiition of this insect, espec- 

 ially in the west and along our northern boundary, leaves nnich to be 

 desired, especially in view of the captures at Canmore and Vancouver. 

 Considering the length of time the female is upon the wing, we need to 

 enquire especially during how extended a period the eggs arc deposited ; 

 and the time when the larva matures is equally unascertained for the north. 

 We need further notes upon the haunts of the buttei-fly and the variation 

 of the larva, as well as a full knowledge of its fooil plants ; it is hardly 

 probable that it is confined to plum, and the indications of Abbot and 

 Lintncr should be regarded. No parasites are known. 



LIST OF ILLUSTRATIONS.— INCISALIA IBUS. 



General. Chrysalis. 



PI. 23, fig. 4. Distribution in North America. PI. 84, fi^. 2G. .Side view enlarged. 



Effff. 32. Dorsal view. 



PI. 65, fig. 9. Colored. 33, 34. .Side views. 



10. Plain. Imago. 



61^ : 8. Micropyle. PI. C. fig. 19. Male, upper surface. 

 Caterpillar. 22. Female, both surfaces. 



PI. 75. figs. 22. 23, 28. Full grown. 34:22. Male abdominal appendages. 



79:42. Front view of head, first stige. 46:25. Androconium. 



io6 



