72 PSYCHE [August 
yellow. Primary hairs are now no longer glandular and tubercles are shaped as in 
brassicae. The subdorsal and stigmatal yellow bands are clearly caused by opaque 
pigment. The addorsal and lateral gray areas seem to have a transparent dark pig- 
ment. There is a faint pale dorsal line. ‘The venter is without skin pigment and is 
therefore pale green. 
The tubercles seem smaller in proportion. ‘Tubercle ii is much smaller than in 
P. brassicae. 
The specimen died in moult and females of the summer brood refused to lay eggs. 
Pontia brassicae (Mancipium). 
About April 4 two females were set over mixed Cruciferae. 
April 13 they were examined and three clusters of eggs were found, numbering 
about 40, 100 and 28. Both females had died. 
Eqqs laid in clusters on the under side of a leaf or on the stem near a leaf. Pale 
yellow and superficially like P. daplidice. 
A hatched specimen mounted dry was much more satisfactory than one in glycer- 
ine jelly. They do not change color. 
First Stage. Each cluster of the eggs hatched entirely on one day, April 18, 19, 
20. ‘They eat the eggs except the base and live gregariously, unlike daplidice. They 
completely lack the glandular hairs. ‘The tubercles are twice as high and two thirds 
the diameter of those of daplidice. But the arrangement is essentially the same. 
Stage II. ‘he first cluster was up for moult April 22, moulted April 23. They 
are still gregarious and to the naked eye unchanged except as to size of head. Pale 
greenish yellow with black dots and tubercles; paler beneath. ‘The subdorsal tub- 
ercles are alternately 2 and 1. The stigmatal ones are small and all beneath them 
inconspicuous (unlike daplidice). 
Dorsal line yellow, subdorsally pale green, much black dotted by the tubercles. 
Laterally paler, with minute tubercles. ‘The subventral dots are again larger, and 
the venter is very green, immaculate. 
Stage III. First larvae up for moult April 24, moulted April 25. Head black 
(it is spotted in this stage of daplidice). Body yellow-green, black-powdered, with a 
narrow yellow dorsal line (wanting in daplidice) the powdering becoming abruptly 
less at the substigmatal line. Tubercles are acute and some are large. The setae 
now are white. 
Stage IV. ‘Tubercle iii is now twice as large as ii or i and the latter are four 
times as large as one directly above ii, which begins to be prominent. The tubercles 
