371 



mont, later oii the n, dorsd/cs only remain in existonce in an 

 unaltered condition. 



P. daplidke also possossos these glandular setae. 



QuAiL (1904) discovered III B == s. prostigmalis on P. hrassicae. 



In opposition with these opinions we find others e. g. : 



Packard (1890, p. 495). "The true Pierinae all live on herhs, 

 sometimes on low bushes and none of them is provided with hairs, 

 bristles or spinules," 



Dyar (1894, p. 204) says: no tracé of tubercles. 



DiXEY (1894) devoted an article to the phylogeny of the Pie- 

 rinae^ paying attention to the wings only. It would be very inte- 

 resting to repeat this study for the larvae. 



As it seemed important to me to examine this question oloser, 

 I chose the caterpillars of two kinds, which are often found on 

 the same plant (Brasxira)^ and are very similar as egg and as 

 imago, but of which one bears briglit warning colours (Poulton, 

 1890) and the other is in near accordance with the surroundings 

 (protective coloration). 



Pieris hrassicae Linn. Plate XIV, fig. 1 — 7. 



Material. Eggs and larvae of the 2nd generation, laid on cab- 

 bage and Tropaeolum. 



Eggs laid in groups on the lower side of leaves, 1 mm. high, 

 shape of a pitcher, with 15 — -18 (mostly 18) vertical ribs, cross- 

 striped. The head of the larva can be seen at the side during 

 the last two days. Duration 4 — 6 days. 



Instar I. Duration 4 days. Length 2^1.^ mm. The larvae bite 

 a little hole in the side of the egg-shell, eat the top of the egg 

 and crawl out. Then they eat the whole egg-shell. Tubercula black, 

 skin yellow-green, transparent, no tracé of stripes. Head imme- 

 diately black, at first a little transparent, after ten minutes 

 pitch-black. Setae near the eyes. 



Prothorax. There occur: s. dorsalis^ s. subdorsalis^ s. suprastig- 

 malis, two s. dorsolaterales on one tuberculum, a Tmnwie s, prostig- 

 iiiafis^ mostly two s. basales. 



The prothoracic shield appears half an lu)ur or two hours 



