1909] FORBES — PIERIS CATERPILLARS 71 
The figures are mere sketches, taken from living caterpillars in part, and should 
not be entirely trusted. But they will probably come nearer the truth than a much 
better description would. 
Pontia daplidice. (Pontia.) 
About April 4a female of the form with light markings and sage green under side 
was confined over Cardamine and other Cruciferae. 
April 9. It has laid several bright orange eggs, of which a specimen was pre- 
served in glycerine jelly (not satisfactory). (The fresh laid eggs are lemon yellow, 
changing later to orange). 
April 13. About 2 eggs have been laid, of which 3 or 4 have hatched. 
Stage I. Bright orange, but not as bright as eggs, brown powdered, with black 
head and setae and deep brown tubercles. ‘The tubercles are black except 
under very strong illumination, but then the setae and head are visibly darker. 
Length 1.6 mm. ‘The upper setae are glandular and shortly forked at the tip, the 
fork containing a drop of secretion. ‘There is a lappet hanging dewn in front of 
the first legs. Setae in primitive arrangement (iv and v on a level). Five yellow 
eyes. 
Cervical shield with three setae in a triangle, on each side; divided. Below it a 
tubercle with two setae, one of which is glandular. One before and two below the 
spiracle. ‘The glandular tubercles are the two upper on thorax and the three upper 
on abdomen. On the abdomen i higher than ii, iv slightly higher than vy on the 
leg bearing segments, level with v on the others. On ninth segment of abdomen iy 
isabsent. Supra anal plate has four pair and anal leg plates each four setae. There 
are 3 setae below on the last segment (A10). 
Diameter of head .39 mm. 
Stage II. Missed. 
Stage III. Moult April 22; but one larva remains. Head .8 mm., gray, so 
powdered with black as to appear dull green. ‘The powdering is of two sizes, about 
5 pair of dots on each segment in a zigzag row being visible to the naked eye. Yellow 
subdorsal and substigmatal lines are caused mostly by a lack of powdering. ‘The 
dark bands twice as wide as the yellow ones. Head black, heavily spotted on a 
yellow background. Apparently two of the subdorsal hairs (i and ii 7), still are 
glandular. All the hairs are similar, strong and black. Some without tubercles 
are not shown on the diagrams. 
Stage IV. Moulted April 25 after one day of rest. Head black powdered on 
