( 369 ) 



XIII. The Colour-relation letiveeii the jyupx of Papilio 

 machaon, Pieris napi and many other S2Kcies, and 

 th'j surroundings of the larvm 2'>reparing to 2^ypate, etc. 

 B}' F. Merrifield, F.E.S., and Edward B. Poul- 

 TON, M*.*A., F.R.S.. etc., Hope Professor of Zoology 

 in the University of Oxford. 



[Read October 5th, 1898.] 



^.—INTRODUCTORY. (F. Merrifield and E. B. Poulton.) 



£.- EXPERIMENTS UPON THE PUP.E OF Papilio machaon. 



1. Experiments ujjon the Summer Pupae of Papilic) machaon. 



(F. M.) 



2. Results of the above Experiments. (E. B. P.) 



3. Experiments upon the Winter Pupae of Papilio machaon. 



(F. M.) 



4. Results of the above Experiments. (E. B. P.) 



5. Mr. C. V. A. Peel's Winter Pupae of Papilio machaon 



described. (E. B. P.) 



C— EXPERIMENTS UPON THE PUPJE OF Papilio poda- 

 lirius. (Cora B. Sanders and E. B. P.) 



J9.— EXPERIMENTS UPON THE PUP^ OF Pieris napi. 



1. Experiments upon the IFi/i^erPupceo/ Pieris napi. (F. M.) 



2. Results of the above Experiments. (E. B. P.) 



i'.— EXPERIMENTS UPON THE PUP^ OF Pieris brassier. 



1. Experiments upon the Winter Pupae of Pieris brassicse. 



(F. M.) 



2. Results of the above Experiments. (E. B. P.) 



3. Experiments upon the Winter Pupae of Pieris brassicoe. 



(E. B. P.) 



4. Experiments tvith conflicting colours upon the Winter Pupae 



o/ Pieris brassicee. (E. B. P.) 



J^.— NOTES ON THE STRUGGLE FOR EXISTENCE IN 

 THE LARV^ OF Pieris brassicse. (E. B. P.) 



G.— EXPERIMENTS UPON THE PUP^ OF Pieris rapae. 



1. Experiments upon tlie Winter Pupae of Pieris rapee. (F. ^I.) 



2. Resxdtsofthe above Experiments. (E. B. P.) 



TRANS. ENT. SOC. LOND. 1899. — PART IV. (DEC.) 25 



