312 LIEUT.-COL. J. M. FAWCETT ON THE 



is decidedly imitative of atrojios-moth, so much so that I have taken it for atroj)OS 

 when at rest on a tree-trunk. At Cape Town both the dark forms (of solani and 

 atropos larvae) are rare in comparison with the green ones." 



Subfamily MackoglossiNjE. 



16. Cephonodes hylas (Linnaeus). (Plate XLVIII. figs. 13-18, larva; fig. 19, pupa.) 



This well-known insect has been reared from six different forms of larva in Natal, 

 which show almost every gradation from an almost wholly green larva with white- 

 subdorsal stripes to an almost wholly black one, in which the subdorsal stripes are 

 replaced by very dark grey ones. 



The various forms will now be described in detail. 



Larva. 1st form. Ground-colour pale green, a white-bordered light blue dorsal line,, 

 and a thin white subdorsal line bordered superiorly by a thin carmine line, the combined 

 lines ending in a yellow streak at the base of the horn. Spiracles white, bordered 

 with red edges, that on 11th somite surrounded by a rufous area. Head green, 1st 

 somite beset with yellow tubercles superiorly ; thoracic legs and claspers brownish ; horn 

 green, curved and pointed, and beset with yellow tubercles. Plate XLVIII. fig. 13. 



This seems to be the Indian form described by Hampson in ' Fauna of British India.' 



2nd form. Ground-colour pale green ; a white-bordered blue dorsal line ; a subdorsal 

 white line defined in places superiorly and inferiorly by small black oval spots ; under 

 surface, legs, and claspers pale brown. Spiracles white, surrounded by oval red areas ; 

 a yellow subspiracular line, interrupted and defined inferiorly with black, which curves 

 up vertically on the posterior half of each somite from 6th to 9th, otherwise as in 

 1st form. Plate XLVIII. fig. 14. 



3rd form. Similar to 2nd form, but differing in the following characters : — The dorsal 

 line is dark grey ; the black oval spots defining the white subdorsal line inferiorly are 

 much more numerous and extend downwards between the spiracles till they meet a 

 black subspiracular line. The red areas surrounding the spiracles more enlarged. 

 Plate XLVIII. fig. 15. 



1th form. Similar to 3rd form, but differing as follows : — Dorsal line darker, the 

 black oval spots defining the white subdorsal line inferiorly are coalesced into a con- 

 tinuous black lateral line ; and the whole body below it is pale brown, with only an 

 isolated patch of green on each somite round the red spiracular areas. 1st somite 

 yellow, covered with small yellow tubercles. Plate XLVIII. fig. 16. 



5th form. Dorsal and subdorsal stripes as in 4th form. Ground-colour black ; 

 a rufous area round each spiracle, and a few irregular yellow marks on each somite ; 

 a few traces of the yellow subspiracular line, and a yellow patch at base of horn ; 

 claspers and anal extremity brown ; head and 1st somite yellowish. Plate XLVIII. 

 fig. 17. 



