The Origin of the Markings of Caterpillars. 337 



insect in a cage with Lacerta Viridis, but they 

 would never even notice them, and I often saw the 

 caterpillars crawl over the body, or even the head 

 of the lizards, without being snapped at. On every 

 occasion the larvae remained for several days with 

 the lizards without one being ever missed. The 

 reptiles behaved in a precisely similar manner with 

 respect to the moth of E. Jacobtzcz, not one of 

 which was ever touched by them. The yellow 

 and black longitudinally striped caterpillars of 

 Pyg&ra Bucephala were also avoided, and so were 

 the brightly coloured larvae of the large cabbage 

 white (Pieris Brassicce), which when crushed give 

 a disagreeable odour. This last property clearly 

 shows why lizards reject this species as distasteful. 

 Both caterpillar and butterfly possess a blood of a 

 strong yellow colour and oily consistency, in 

 which, however, I could not detect such a decided 

 smell as is emitted by that of the Heliconince and 

 Danaince. 11 



I next made the experiment of placing before 

 a lizard a caterpillar as much as possible like that 

 of E. Jacobcza. Half grown larvae of Bombyx 

 Rubi likewise possess golden yellow (but narrower) 



II [It appears that the nauseous character of these last 

 butterflies is to a certain extent retained after death, as I 

 found that in an old collection which had been destroyed by 

 mites, the least mutilated specimens were species of Danais 

 and Euplaa, genera which are known ' to be distasteful when 

 living, and to serve as models for mimicry. See Proc. Ent 

 Soc. 1877, p. xii. R.M.] 



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