382 



Annals of the South African Museum 



The dift'ereuees are as iudicated iu the table (p. 376) to which may 

 be added : antehunieral yellow baud broader, fused to yellow of aute- 

 alar sinus in one specimen, very nearly so in the other one ; basal 

 yellow ring of segment 7 much broader, between one-half and two- 

 thirds of the seg-ment's length ; dorsal process of tenth segment 

 slightly smaller and different in shape, as shown iu Text-fig 67. 



Ahd. 51, hdw. 41, 2>f- 2-5 mm. 



These differences, slight as they are, may safely lie claimed as 

 specific, since differences in colour appear together with other structural 

 ones. Especially important is the presence of a frontal yellow band 

 in chjmene. The pair of forms here described recalls another pair 



Fig. hi.— Mac 



chjmene, $. Kapiri. 'IVrininal 

 side and dorsal views. 



closely similar to each other — terpsichore, Forst., and melpomene. His, 

 from New Guinea, which we have good reasons to consider as distinct 

 species. Mr. Williamson's studies on North American Macromia give 

 also evidence of specific differences being sometimes very slight iu this 

 genus. 



II Db. Subfamily LIBELLULINAE. 



In a collection of dragonflies from almost every region of the globe 

 individuals belonging to this systematic unit will probably be in 

 majority over those of all the other units taken together, supposing 

 that the material is not accumulated by a specialist more interested in 

 it than in groups. LibeUuliitae are numerous in species, many of these 



