The Origin of the Markings of Caterpillars. 191 



fifteen are known in the form which they possess 

 at the last ontogenetic stage. 



GROUP i. I can furnish but little information 

 with respect to this group. The first species with 

 which I became acquainted was Chczrocampa 

 Syriaca, 5 of which I saw two blown caterpillars in 

 Staudinger's collection, and which I have figured in 

 PL IV., Fig. 29. The larva is green, and has the 

 short oblique stripes over the legs common to so 

 many species of Chczrocampa, the only marking 

 besides these being a simple white subdorsal line, 

 without any trace of eye-spots. This species exactly 

 corresponds therefore with the second ontogenetic 

 stage of C. Elpenor and Porcellus. The account of 

 the species, both in the larval and perfect state, is 

 unfortunately so imperfect, that we cannot with 

 certainty infer the age of the two caterpillars from 

 their size. If the moth were of the same size as 

 Elpenor, then the caterpillar figured, having a 

 length of 5.3 centimeters, would not be in the last 

 but in the penultimate stage, and it remains doubt- 

 ful whether it may not acquire eye-spots in the last 

 stage. 



That species exist, however, which in their last 

 stage correspond to the second stage of Elpenor, 

 is shown by two of the forms belonging to 

 Walker's genus Darapsa, which was founded on 



apparently sufficiently distinct." The species still retained in 

 the genus Darapsa is D. rhodocera, Wlk., from Haiti. R.M.] 

 * \Otus Syriacus of Butler's revision. R.M.] 



