314 Annals of the South African Museum. 



The males agree well with Forster's description of that sex ; the 

 association of Mr. Marshall's females with them is not quite certain, 

 but it may claim a good deal of probability. The colour system, stature 

 and condition of A* and Cuq is very much the same ; the difference 

 between these females and the same sex of acaciae and massaicum lies 

 in the size and especially in the well-developed pro thoracic styles. 

 They are to some degree similar to praetextatum and Salisbury ense, 

 though distinct by the reduction of black lines on the thoracic dorsum, 

 which reduction goes beyond what may reasonably be expected even 

 in extreme specimens of those darker species. 



CERIAGRION (Selys, 1876). 



This genus embraces a small number of species inhabiting the 

 tropical part of the Old World. They are common and widely dis- 

 tributed in low levels and coast districts, and consequently have 

 been described comparatively early (glabrum, coromandelianam, eru- 

 bescens, cerinorubellum). Recently additional species have been found 

 in tropical Asia and especially Africa, which there is evidence to 

 suppose is the centre of the genus. One species is found within our 

 faunal limits in almost iiuiversal distribution ; a second one, from 

 Katanga, may be advantageously described here, as its occurrence in 

 Rhodesia is probable. 



1. Wings of adult male decidedly yellow, of female variable from hyaline to 



greyish yellow. Abdomen of male bright orange, of female dull greyish 

 ochreous. Caudal end of tenth segment in male with a regularly arched 

 excision ; the lateral edges of this excision projecting as blackish, 

 denticulate tubercles. The superior appendages distinctly shorter than 

 the inferior .......... C. glabrum. 



2. Wings of adult male very light yellowish grey, of female almost hyaline. 



Abdomen of male pinkish ochreous dorsally, turning to whitish ochreous 

 at the, sides. Caudal end of tenth segment in male with a similar 

 excision, bxit the lateral tubercles absent. Superior appendages as long, 

 or very slightly longer than the inferior. Abdomen comparatively 

 longer and narrower than in f/labrwn . . . . . . C. suave. 



CERIAGKION GLABRUM (Burmeister, 1839). 



S. Afr. Mus. : 1 J , Blue Cliff, Dunbrody (ii . 1912) ; 1 ? , Barberton, 

 Transvaal; 6^,5 ? , M'Fougosi, Zululand fiii, iv, v . 1911, Jones) ; 

 9^,5 9 , Lorenco Marques (24, 25 . ix, 22 . x, 1, 5 . xii . 1911) ; 1 ? , 

 Bulawayo (21 . iii . 1912). Coll. E. B. Williamson : 9 <J , Natal (G-. F. 

 Leigh) ; 5 $ , 1 $ , Princetowu, Natal (8, 18 . xii . 1908 : 18, 22 . ii . 1909, 

 id.} ; 2 (J, 1 ,woodside o ff Umbila Road, Congella, near Durban, 

 Natal (20.x. 1904, 29. iii. 1905, id.) ; 1 <J , Hilton Road, 3500 ft., 



