378 Studies in the Theory of Descent. 



and is only retained on the anterior segments 

 where the latter are wanting. In some few cases 

 both elements of marking certainly occur together, 

 such as in Calymnia Panopus and Macroglossa 

 Corythus ; but the oblique stripes are, under these 

 circumstances, shorter, and do not extend above 

 the subdorsal line, and in Darapsa Ckcerilus even 

 become fused into the latter. 7 



In certain cases there may also be a special leaf 

 structure imitated by the longitudinal lines, but 

 on the whole the latter diminish the effect of the 

 oblique stripes ; and we accordingly find that not 

 only has the subdorsal disappeared from those 

 segments with oblique stripes, but that most larvae 

 with this last character are also without the other- 

 wise broad spiracular and dorsal lines. This is 

 the case with all the species of SmerintJms 8 known 



7 [In the following species, already mentioned in previous 

 notes, the oblique stripes are bounded at their upper extremities 

 by a conspicuous subdorsal line : Acosmeryx Ancens, Cram. ; 

 Sphinx Cingulata, Fabr. ; Pachylia Fiats, Linn. ; P. Syces, Hubn. 

 In Pseudosphinx Cyrtolophia, But!., the oblique white stripes, 

 beautifully shaded with pink, run into the white pink -bordered 

 dorsal line, so that when seen from above the markings 

 present the appearance of the midrib and lateral veins of a 

 leaf, and are probably specially adapted for this purpose. 

 R.M.] 



8 [The dorsal line as well as the oblique stripes is present 

 in the caterpillar of Smerinthus Tartarinovii, Menet.; and in 

 Ambulyx Gannascus, Stoll., the oblique stripes are bounded 

 above by a subdorsal line, as in the species named in the 

 preceding note. R.M.] 



