PIERIS I. 
Egg. — Long, narrow, conical, the base and top flattened, depressed; ribbed 
longitudinally, the interspaces excavated, and crossed by numerous strise ; of two 
examples under view, one has the ribs rather prominent, the other flattened, 
as are also the intervening spaces, and the middle is much swollen, after the 
manner of an egg of Colias; both have 14 ribs; color when first laid yellow, 
shortly before the end of the stage red (Figs, a a 2 , a 3 micropyle). 
Mature Larva: — Length .9 inch ; cylindrical, tapering slightly from middle 
segment to extremity ; color light yellow crossed with stripes of black; each 
segment several times creased, and on the ridges so caused are small yellow tu¬ 
bercles of irregular sizes, each giving out a short, fine black hair ; on all segments 
after 2 and including 12, are two stripes to the segment; on 3 and 4 these have 
nearly even edges; but from 5 to 12 the anterior one has the front edge either 
sinuous or escalloped, so that an arch falls on middle of dorsum, and sometimes 
it is produced quite to the anterior edge of the segment, and another falls on 
either edge of dorsal area; usually this stripe is broken on lower part of side ; 
the stripe on posterior part of the segment is narrow and is prolonged to the 
basal ridge ; along this ridge is a macular black band ; under side yellow-white ; 
feet black, pro-legs yellow ; head sub-globose, granulated; the upper front face 
broadly black ; a black triangle over mandibles, and the ocelli are black on a 
black bar. (Figs. b l , b 2 , b 3 .) From egg to chrysalis 33 days in April and May; 
in May and June 30 days. 
Chrysalis. —Length .5 to .53 inch ; cylindrical; the head case narrow, exca¬ 
vated on either side ; a short, stout projection between the eyes; mesonotum 
prominent, rounded, a little carinated, followed by an excavation about as deep 
as the mesonotum is high, but not evenly rounded, rather angular; on either side 
of dorsum, on anterior abdominal segments, are thin and angular elevations, all 
slight, the foremost one most prominent; color dark brown; whole surface, ex¬ 
cept the wing covers, covered with irregular granulations. (Fig. c.) 
This species is found both in North and South California, in Nevada, in South¬ 
ern Colorado, and in Arizona. Mr. 0. T. Baron, in his excursions through North¬ 
ern California, found Sisymbri abundant, and twice succeeded in bringing the 
larvae to maturity, and imago. Eggs laid 11th April hatched 25th. The first 
moult took place 7th May, the second on 13th, the third 20th, and pupation took 
place 28th May. These eggs were obtained by confining the female in bag over 
the food-plant. 
Another lot of eggs which were found, hatched 5th May. The first moult 
took place 14th, the second on 19th, the third on 25th, and pupation 4th June. 
By Mr. Baron’s observations there were but three moults. Mr. T. L. Mead, 
in 1878, found the butterfly as well as caterpillars in Southern California, and 
