Ill 



ment, later on the .v. dorsales only remain in existence in an 

 unaltered condition. 



P. tlaplidict also poesemes these glandular setae. 



Ql' AIL (U>04) discovered III Bss.*. ftfOsttujmaliK on P. brassirae. 



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



Packard (1890, p. 495). "The true Pieriwu all live on herbs, 

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

 bristles or spinules." 



Dyak (1894, p. 204) says: no trace of tubercles. 



DiXKY (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 si>emed im|)ortant to me to examine this question c1o8(t, 

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

 the same plant {Branitira), and are very similar as egg and as 

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

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

 (protective coloration). 



Pieris brassicae Linn. Plate V, fig. 1 — 7. 



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

 bage and Tropaeolum. 



Efftjs 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 /. Duration 4 days. Length 2' .^ 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 trace 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- 

 maliSj two s. dorsolaterales on one tuberculum, a minute s. prostig- 

 malis^ mostly two s. basales. 



The pro thoracic shield appears half an hour or two hours 



