258 Studies in the Theory of Descent. 



from P. Gorgoniades, Hlibn., 48 a species now 

 inhabiting south-east Russia, and for a knowledge 

 of which I am indebted to Dr. Staudinger's collec- 

 tion. There are in this about eight blown speci- 

 mens, from 3.710 3.9 centimeters in length, which 

 show a marking, sometimes on a red and some- 

 times on a green ground, which unites this species 

 with the young form of/ 7 . CEnotherce,v\z., abroad 

 white subdorsal line, extending from the small 

 caudal horn to the head. In addition to this, how- 

 ever, the caterpillar possesses an extraordinarily 

 broad white red-bordered infra-spiracular line, a 

 fine white dorsal stripe, and a similar line be- 

 tween the subdorsal and spiracular, i.e. a supra- 

 spiracular line. 



The caterpillars in Staudinger's collection, not- 

 withstanding their small size, all belong to the last 

 stage, as the moth itself does not measure more 

 than 2.6 centimeters in expanse, and is therefore 

 among the smallest of the known Spkingidce. 

 This species has therefore in the adult condition a 

 marking very similar to that of CEnotkera when 

 young it bears to CEnothercz the same relationship 

 that Deilephila Hippophaes does to D. Euphorbia, 

 only in the present case the interval between the 

 two species is greater. Gorgoniades is obviously 

 a phyletically older species, as we perceive from 

 the marking and from the possession of a horn. 



48 \Proserpinus (Sphinx) Gorgon, Esp. R.M.] 



