39$ Annals of the South African Museum. 



hamuli of male, thoracic pattern of pruinose males and generally 

 smaller size (Text-fig. 72). 



First described from East Africa (Kilimandjaro), and probably 

 most developed in that region ; but specimens examined by the 

 writer from the Belgian Congo, Kamerun and Sierra Leone give it 

 a much wider range, similar to the habitat of the following species. 



OKTHETKUM GUINEENSE (Ris, 1909). 



S. Afr. Mus. : 1 <J, MTongosi, Zululand (xi . 1911, W. E. Jones) ; 

 1 J , Umhlali, Natal (i . 1913, K. H. Barnard). Coll. E. B. Williamson : 

 1 c, Salisbury, Mashonaland (iv . 1905, Marshall); 1 $ , Umtali, 

 3700 ft,, Mashonaland (xii . 1900, /</.) ; 2^,59, Natal (G-. F. Leigh) ; 

 1 (J, 1 ?, woodside off Umbilo Eoad, Congella, Natal (19 . x . 1904; 

 17 . i . 1905, id.). 



FIG. 73. Orthetrum guineense, . M'Fongosi. Genitalia, second seg- 



"-it, left side view. 



The specimens here recorded (and described in table, p. 394) 

 agree perfectly with the type series of 0. guineense as described from 

 Angola and other parts of equatorial West Africa. The chief 

 distinctive character is the hamule of males. But this structure, is 

 subject to misleading differences in position in this species more than 

 in the others here discussed, and careful examination is often 

 necessary. Differences in colour and pterostigma are extremely 

 slight in comparison with O. Abbott i, not even considerable with 

 many specimens of chrysostiyma. The hamule is nearest 0. stemmale 

 capense, and extremely old and obscured specimens may resemble, 

 this species in colour of body and basal spot in hind wing (though 

 not easily in pterostigma). 



A series of specimens mentioned and described under guineense 

 (from the Sclysian Collection and Stockholm Museum) in the additions 

 to my Libelluliuae monograph is purposely omitted here, as its 

 identification is somewhat doubtful and the specimens are no more 

 at hand. 



