128 



THE YOUNG NATURALIST. 



[July 



stripes suffuses the whole of the dorsal area, while in others, they exist 

 simply as fine lines, often reduced to a series of dots, by the breaking 

 up of the lines in the neighbourhood of the abdominal incisions." 



(2) . " Ground-colour green, with the reddish dorsal and sub-dorsal 

 stripes offering almost as great differences as in Var. 1, both as to 

 depth of colouring, and area of suffusion." 



(3) . " Ground-colour whitish, with very faint reddish stripes, 

 sometimes only a faint reddish tinge in the dorsal and sub-dorsal 

 area." 



(4) . " Ground colour whitish, with indistinct grey, narrow dorsal 

 and sub-dorsal stripes, in fact almost unicolorous. 



" These differences were not due to different stages of maturity, as 

 these descriptions were made from larvae when perfectly full-fed." 



Mr. South in the " Entomologist," Vol. XV., p. 32, thus describes 

 the larva : — " Length 7.'" moderately stout. Head shining black, and 

 but little smaller than 2nd segment, the upper part of which segment 

 is also shining black. Ground colour whitish, with a broad dorsal and 

 narrow sub-dorsal stripe, rosy-brown. Several small black warts, 

 from which short hairs are emitted, are scattered over the dorsal and 

 sub-dorsal area ; these are rather larger in the 3rd. segment. There 

 is also a row of larger black warts along the spiracle line." Mr. Sout n 

 also refers to the description of Mr. Peers (" Entomologist," Vol. II., 

 p. 38), which states " dorsal line light brown ; sub-dorsal line broader, 

 lighter brown ; head and second segment fulvous." It will be seen 

 that both Mr. South's own description and that of Mr. Peers only 

 represent two unequally suffused forms of my var. 1, described above. 

 Mr. South uses the term "rosy brown," for the colour of the dorsal 

 and sub-dorsal lines, Mr. Peers the term " light brown," whereas, in 

 fact, had either of these observers possessed sufficient material, they 

 would have found specimens varying from " unicolorous green or 

 whitish grey" (the ground colour) to "unicolorous rosy or light 

 brown " (i.e. specimens entirely suffused). Mr. South also suggested 

 that there were two species mixed up in our collections owing to this 

 slight difference in these two descriptions of the larvae (' Entomolo- 

 gist,' XV., pp. 32-33), and afterwards suggested (' Entomologist,' 

 XVIII., p. 170), that we had still another " species (farfavella) feeding 

 in the tomentose under sides of the leaves of T. favfara" The first 

 idea was effectually disposed of when I showed that the larva was so 

 excessively variable, and the second, when I succeeded in breeding a 



