1885.] Colouring of Phytophagous Larva?. 315 



EXPLANATION OF SPECTRUM CHART. 



Spectrum 1. — The blood of the larva of P. Meticulosa (green variety) examined in a 

 thickness of about "75 mm. by sunlight. The blood had been allowed to 

 remain in an open capillary tube for about four days, and was then sealed up 

 after it had evaporated to half its bulk. 



Spectrum 2. — The fresh and unaltered blood of the pupa of S. IAgustri, examined 

 in a thickness of 35 mm. by sunlight. 



Spectrum 3. — The fresh and unaltered blood of the pupa of P. Bucephalus, examined 

 in a thickness of 23 mm. by sunlight. 



Spectrum 4. — Two fresh calceolaria leaves, gently compressed and examined by sun- 

 light. 



Spectrum 5. — Five ditto ditto. 



Spectrum 6. — The fresh and unaltered blood of the pupa of S. Ligustri, examined 

 in a thickness of 3 mm. by illumination from the bright sky near the sun. 



a D C ! p E h F 



75 '70' 65 SO i 55 



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