The Odonnta or Dracjonflies of South Africa. 329 



de Selys, was carefully compared with our series of E. gluucum. It 

 was found to agree in all respects, except that the postocular spots 

 are entirely absent (and appear to be so originally, not only by post- 

 mortem discoloration). But clearly this is only the extreme grade of 

 the variation as described above from our specimens of glancum, and 

 obi i tent tit in must be considered as a variety not deserving of a name. 



ENALLACMA SCHULTZEI (Eis, 1908). 



No other specimen of this form has come to hand, so it stands 

 based on the unique type. When the description was published only 

 a very limited number of specimens of E. glaucum were available for 

 comparison. It is obvious that the differences from glaucum (see p. 

 318) may only represent an extreme degree of reduction of black and 

 invasion of light blue elements. Although I believe that the species 

 stands as a doubtful one, further discoveries will settle the question. 



/^ 



ENALLAGMA FRACTUM, n. sp. 



Mus. Tervueren : 4 ^,2 9, Kapiri, Katanga (ix . 1912, Legros). 

 Coll. E. B. Williamson : 4 <J, 1 <$ 9 '*' c "P-> Salisbury, Mashoualaud 

 (ii . 1900, G. A. K. Marshall) ; 1 J.ibiil. (v . 1905, id.). 



cJ. Occiput very light bluish grey. Labium whitish. Dorsal 

 surface of head greenish blue ; a black transverse band from slightly 

 behind the base of antennae to somewhat beyond the posterior ocelli; 

 a narrow line on occipital margin and large postocular spots remaining 

 blue ; the latter confluent with light colour on occiput. Prothorax 

 greenish blue, narrowly black in mid-dorsal line. Thoracic dorsum 

 greenish blue and black ; narrow blue line on median suture ; black 

 band something less than one-half the breadth of mesepisternum, 

 otherwise blue with a narrow black line and a somewhat stronger dot 

 in the dorsal end of humeral suture. Sides very light greenish blue ; 

 very small blackish dot in dorsal end of second lateral suture. 

 Ventral side whitish ; indication of partially interrupted blackish 

 lines on external side of femora and tibiae. 



Abdomen very slender ; very light blue shading to greenish - 

 marked black. Segment 1 black spot at base of dorsum ; 2 lanceo- 

 late black spot, joined to a very narrow terminal ring by a fine 

 line, reaching the anterior end in a fine point (slightly dilated at 

 anterior end in part of the specimen) ; 3-G narrow terminal ring, 

 joined to a dorsal spot which, rounded at the posterior end, abruptly 

 contracts to a line and remains slightly short of the anterior end ; 

 7 an analogous marking at the posterior end running into a black 



