The Origin of the Markings of Caterpillars. 177 



I. 



ONTOGENY AND MORPHOLOGY OF SPHINX MARKINGS. 



THE GENUS CH^ROCAMPA, DUPONCHEL. 



ALTHOUGH by no means in favour of the excessive 

 subdivision of genera, I am of opinion that 

 Ochsenheimer's genus Deilephila has been 

 correctly separated by Duponchel into the two 

 genera Chcerocampa and Deilephila, sensu strictiori. 

 Such a division may appear but little necessary 

 if we examine the perfect insects only ; but the 

 developmental history of the caterpillars shows 

 that there is a wide division between the two 

 groups of species, these groups however being 

 branches of one stem. 



CILEROCAMPA ELPENOR, LINN. 



Some captured females laid single eggs sparsely 

 on grass, wood, and especially on the tarlatan with 

 which the breeding-cage was covered. The eggs 

 are nearly spherical, but somewhat compressed, 

 of a grass-green colour, a little lighter, and some- 

 what larger (1.2 millim.) than those of Deilephila 

 Euphorbia. During the development of the 



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