268 Studies in the, Theory of Descent. 



genus Anceryx, I find, in addition to the one 

 described, notices of only two caterpillars : 



A. Coniferamm^ a North American species, 

 lives on Pinus Palustris, and was figured by Abbot 

 and Smith. Colour and marking very similar to 

 A. Pinastri. 



A. Ello, Linn., 55 according to the authority of 

 Merian, is described by Clemens 56 as dark brown, 

 " with a white dorsal line, and irregular white spots 

 on the sides." It lives on a " species of Psidium 

 or Guava" 



Most of the species of Anceryx appear to live 

 on Conifertz, to which they show a general and 

 decided adaptation. In the absence of decisive 

 information, I partly infer this from the names, as 

 Anceryx Juniperi (Africa). It has long been 

 known that in our A. Pinastri the mixture of 

 brown and fir-green, interspersed with conspicuous 

 irregular light yellowish and white spots, causes 

 the adult larva to present a very perfect adapta- 

 tion to its environment. Of this caterpillar Rosel 

 states : " After eating it remains motionless, and 

 is then difficult to see, because it is of the same 

 colour as its food, since its brown dorsal line 

 has almost the colour of the pine twigs ; and who 



14 [= Ellema Coniferarum, of Butler's revision. R.M.] 

 65 [= Dilophonota Ello of Butler's revision. R.M.] 

 69 "Synopsis of the North American Sphingides." Philadelphia, 

 1859. 



