398 Aiinah <)/' flie Soutli African Museum. 



hamuli of male, thoracic pattern of pruiuose males aud generally 

 smaller size (Text-fig. 72). 



First described from East Africa (Kilimaudjaro), aud probably 

 most developed iu that regiou ; but specimens examined by the 

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

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



Obthetkum guineense (Eis, 1909). 



S. Afr. Mus. : 1 S, MTougosi, Zululaud (xi . 1911, W. E. Joues) ; 

 1 J , Uuihlali, Natal (i . 191 o, K. H. Barnard). Coll. E. B. Williamson : 

 1 c^, Salisbury, Mashimaland (iv . 1905, Marshall); 1 ?, Umtali, 

 3700 ft., Mashoualand (xii . 1900, id.) ; ■2^,b<}, Natal (G. P. Leigh) ; 

 1 <?, 1 9 , woodside off Umbilo Eoad, Cougella, Natal (19 . x . 190-i; 

 17 . i . 1905, id.). 



Fia. 13.— Orthetrutn guineense, J. M'Fongo.si. Genitalia, second seg- 

 ment, left side view. 



The specimens here recorded (aud described iu table, p. 394) 

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

 Angola aud other parts of equatorial West Africa. The chief 

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

 subject to misleadiug differences in position in this species more thau 

 in the others here discussed, and careful exaniiuatiou is often 

 necessary. Differences in colour and {iterostigma are extremely 

 slight in comf)arison with 0. Ahhofti, not even considerable with 

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

 capense, and extremely old and obscured specimens may resemble 

 this species in colour of liody and liasal spot iu hind wing (though 

 not easily iu pterostigma). 



A series of specimens meutioned and descriV)ed under guineense 

 (from the Si'lysiau Collection and Stockholm Museum) in the additions 

 to my Libellulinae monograph is purposely omitted here, as its 

 identification is somewhat doubtful and the specimens are no more 

 at hand. 



