May, '08] ENTOMOLOGICAL NEWS. 209 



duration of the egg stage is about seven days, varying according to 

 the season. 



First Instar. Length, a little over I mm. Color, orange-yellow, be- 

 coming lighter in a day or two ; head almost black ; body sparsely 

 covered with dark colored hairs. 



Second Instar. Length about 4 mm. Color, light greenish, soon 

 turning dark; head black. 



Third Instar. Length, 5.5 mm. The markings can now be plainly 

 seen; the dorsal stripe is bluish or grayish green; on each side of this 

 is a subdorsal yellowish green stripe, then a lateral grayish green stripe, 

 and finally an infralateral yellowish line; ventral surface greenish; head 

 greenish almost black; numerous black tubercles scattered over the 

 body. 



Fourth Instar. Length, 17 mm. ; maculations more sharply defined 

 than before ; head rather light greenish-gray sprinkled over with black 

 tubercles from which protrude short bristles. 



Fifth Instar. Length in motion 33 mm. ; at rest 28 mm. Cylindrical, 

 slender; head rounded, small. Colors much brighter; ground color 

 dark green; upper half of infralateral line white, lower half yellow; head 

 green speckled with black ; thoracic legs black, abdominal ones green- 

 ish-yellow. 



The larva, when full grown, loses its bright colors and soon 

 spins the silken buttons and girdle from which it is to hang, 

 The former colors are replaced anteriorly and on the line of 

 the spiracles by a purplish tinge. After the girdle is completed, 

 the larva remains quiet for from 36 to 40 hours, when pupa- 

 tion takes place. It will not be necessary to give at length 

 this operation, as it has already been described in the case of 

 a closely allied species (olympia) and is also much similar to 

 that of Pontia rapac and others of that genus. 



Chrysalis. Average length 26 mm. Cylindrical, slender, thickest in 

 middle and tapering therefrom evenly, the ends being nearly equal size. 

 At first the chrysalis has the same general purplish tinge of the larva 

 and the dorsal side shows the same markings. The wing-cases and pro- 

 jection of head are almost transparent. These, especially the latter, 

 soon turn dark. Final color, anterior portion dark brown, continuing 

 on the ventral side to the tips of the antennae, which are light, and 

 on the dorsal side only to a point opposite the eyes ; wing veins marked 

 in brown ; dorsal side of thorax and abdomen light yellow or cream 

 color ; ventral side light brown. There arc five well-defined lines on the 

 pupa; a dorsal one, dark brown, running the full length of the body 



