1909] FORBES — PIERIS CATERPILLARS 73 
seem to make squarish black lateral spots on each segment. On the thorax there is 
an exceedingly large tubercle laterally (iii ?). The head is still black. 
Stage V. ‘There is little change in the body. The head is now pale, spotted 
with black. 
Pontia rapae. (Pieris:) 
April 20. ‘Two females were set over Cruciferae for eggs. 
May 3. ‘There are a dozen or so eggs and five baby larvae. 
Eggs differ from those of brassicae in being smaller, and being laid singly. 
Unlike those of daplidice they remain straw-yellow without any change of color till 
hatching." 
The larvae at first are a pale deadleaf yellow, including their head and tubercles. 
They sometimes rest on withered leaves and are almost impossible to see. 
In this stage the tubercles are conical as in brassicae, but they are proportion- 
ately much smi ller, and the upper ones are glandular. 
Stage II. 'Vhe tubercles all look much alike and are pale with black setae. 
The primaries are Ligher, larger and paler, and the upper ones have glandular setae. 
The setae are a little irregularly in about five transverse rows, the three major rows 
which show so prominently in P. daplidice not being distinct. 
Stage III. ‘The first larva changed May 7. ‘Tubercles i to v are now all quite 
distinct and white, the others are more numerous than in stage II and not contrasting 
in color. ‘The larva now appears green and velvety to the naked eye, like the full 
grown ones. 
Stage IV. ‘Tubercle iv is no longer white and contrasting, but 1, i, iii and v are 
still prominent, more so than before. There is a continuous yellow dorsal line and a 
very much broken substigmatal line. The hair is dark; that of 1, 1 and 11 still 
glandular. 
Stage V is the full grown larva and no description was taken. ‘The white 
primary tubercles still show. 
1 American specimens bred this spring change color, but not so strikingly as P. daplidice. 
