IV] 



THE LARVA OR NYMPH 



89 



frequently occur at the postero-lateral margins of the more 

 posterior segments (A, B, Isp). 



Heymons [72] has investigated the posterior end of the abdomen, 

 with a view to shewing the presence of reduced eleventh and 

 twelfth segments. His conclusions, which will be more fully 

 appreciated by a study of the appendages (see below), determine 

 the eleventh segment as being represented by a single tergite 



Fig. 37 Larval exuviae of Auatropetalia 

 patricia Tillyard. (Natural size.) 

 Original- 



Fig. 38. Larva of Cordulephya montana 

 Tillyard. Below, the head seen from 

 in front. (x3.) Original. 



(base of the appendix dorsalis) and a bipartite sternite (bases of 

 the cerci). If these appendages, especially in young larvae, be 

 forced apart, three small processes can generally be made out 

 surrounding the anus. Of these, the mid-dorsal one, or lamina 

 supra-analis (fig. 39 G, la), is the reduced twelfth tergite; while 

 the two lateral ones, or laminae sub-anales (Id'), represent the 

 bipartite sternite. Heymons has also traced these parts in the 

 imago. 



