

Phyletic Parallelism in Metamorpkic Species. 453 



the nearest conceivable form-relationship to 

 Ocellatus possesses a relatively strongly diverging 

 larva, so does the nearest form-relation of 

 Populi (imago) offer a parallel case. This species, 

 which is also North American, lives on Jnglans 

 Alba. The imago of Smerinthus Juglandis 

 differs considerably from S. Populi in the form of 

 the wings, but it resembles the European species 

 so closely in marking and colouring that no doubt 

 can exist as to the near relationship of the two 

 forms. The caterpillar of S. Juglandis? 1 how- 

 ever, differs to a great extent from that of Populi 

 in colour it is not possible to confound these two 

 larvae ; but those of Populi and Ocellatus are not 

 only easily mistaken for one another, but are dis- 

 tinguished with difficulty even by experts. 



In this same family of the Spkingida cases are 

 not wanting in which, on the other hand, the 

 moths are far more closely allied than the larvae. 



" Abbot and Smith, PI. XXIX. [Placed by Butler in the 

 genus Cressonia, Grote and Robinson. Abbot and Smith 

 state that this larva is sometimes green. According to Mr. 

 .Herman Strecker (Lepidop. Rhopal. and Hetero, Reading, Pa. 

 1874, p. 54) it feeds upon black walnut (Juglans Nigra), 

 hickory (Gary a Alba), and iron wood (Ostrya Virginia*). Of 

 the North American species of Smerinthus, the following, in 

 addition to Excacatus, closely resemble our Ocellatus: S. 

 (Calasymbolus) Gfminatus, Say; (C.) Cerisii, Kirby; and 

 Ophthalmicus, Boisd. In addition to 5. (Cressonia) Juglatidis^ 

 S. (Triptogon) Modesta much resembles our Populi. The larva 

 of Geminatus, according to Strecker, is " pale green, lightest 

 above, with yellow lateral granulated stripes; caudal hom 

 violet; stigmata red. It feeds on the willow." R.M.] 



