The Odonata nr Dragonflif* nf South Africa. 



397 



and Abbott! are sometimes not easily distinguished: as a 

 rule chri/tottiijiim is the largest of the three, has almost regularly two 

 rows Rs-Rs2>l at least for a few cells' length, has the pterostigma 

 smallest and lateral black bands on abdomen reduced, often inter- 

 rupted ; in mature colour and good condition the mesepimeral whitish 

 stripe is a fairly constant character also for the female of chrysnffiyiix-i 

 (Text-fig. 71). 



This species, first described from the Canary Islands, is found 

 throughout the African Continent from Algeria to Natal, also in the 





FIG. 71. Orthetrum chrysostigma, $. Barberton. Genitalia, second 



segment, left side view. 



extreme south of Europe and in part of Mediterranean Asia. There 

 is no other than individual variability recognisable. When working 

 out Orthetrum for the Libellulinae monograph, the writer supposed 

 the two following forms to be geographical sub-species of chrysostigma \ 

 but more extensive materials and more careful study of the matter 

 made this view untenable, and a new arrangement (like the one given 

 here) is adopted for the additions to the mouogi-aph. 



ORTHETRUM ABBOTTI (Calvert, 1892). 



S. Afr. Mus. : 3 (?, 3 ? , and 2 cJ $, z'/i cnp., MTongosi, Zululand 

 (ii, iii . 1912, W. E. Jones). Brit. Mus. : 1 9 , Willow Grange, Mooi 



FIG. 72. Orthetrum abbotti, $. M'Fongosi. Genitalia, second segment, 



left side view. 



River, Natal (9 . ii . 1913, E. C. Wroughton). Coll. Eis : 1 <J, 

 Botchabelo, 1200 m., Transvaal (23 . ii . 1914, H. Juuod). 



Extremely similar to following species in abdominal pattern, large, 

 bright yellowish pterostigma and general outline ; but different by 



