354 Annals of the South African Museum. 



Wings hyaline, costal vein lined with yellow in front. Venation 

 partly ferruginous in basal and costal part of wing. Pterostigma 

 light yellow between thick black veins. 



9 . Similar to male, black markings somewhat reduced ; black 

 on labrum indistinct, absent on postclypeus ; black markings on 

 abdomen comparatively narrower throughout, absent on tenth segment. 

 Appendages and supra-anal tubercle yellow. On free margin of 

 occipital plate two strong spines directed forward and laterally ; on 

 anterior surface of plate a small rounded tubercle ; vertex as in male. 

 Abdominal segments 7-10 but moderately extended ; no foliaceous 

 dilatations on 8-9. Groove on ventral plate of 9 comparatively small ; 

 vulvar scale broadly triangular, excised (Text-fig. 59). Appendages 

 comparatively short and robust. Wings slightly tinged with yellow 

 in sub-costal and cubito-aual space. 



cJ , Abd. 31 + 2-5, hdw. 28, pt. < 4 mm. ? , 34, 30, 4. 



Fio. 59. Onychogomphus supinus, $ . Kranspoort. Terminal segments, 



ventral view. 



(a) A female from M'Fongosi, Zululand (xii . 1911, W. E. Jones) 

 agrees in most characters with the other specimen from this locality, 

 but differs in the following points : (1) Pterostigma almost black, 

 turning to brown only at posterior margin; (2) wings tinged with 

 yellow all over to half-way from base to nodus in costal and sub-costal 

 space, to the triangle in cnbito-aual space; (3) vulvar scale more 

 broadly and deeply excised. 



Of the occipital spines only the left one is developed, the right one- 

 indicated by a rudiment. Abd. 33, hdw. 29, pt. 3 mm. This specimen 

 might belong to a distinct species, but in absence of the male it would 

 not be safe to accept this view. 



CEEATOGOMPHUS (Sclys, 1854). 



This genus was established for the single species here described, 

 which is rather widely different from Onychogomphus in its male 

 appendages and female genital segments, though the affinity is clearly 

 indicated by the neural characters. 



