404 Annals of the South African Museum. 



here, too, there is no certainty, and many exceptions occur in the 

 material examined bv the writer. 



PALPOPLEURA JUCTJNDA (Rambur, 1842). 



S. Afr. Mus. : 1 9 , Rietfontein (13.x. 1904) ; 1^,1 9 , Waterval 

 (16, 17. xi. 1900); 7 cJ, 12 9,M'Fongosi, Zululaiid (ii, iv.1911, 

 W. E. Jones) ; I <$ , Machava, Delagoa Bay (14. xi. 1911), Waterberg, 

 S.W. Protectorate (ii . 1920, Tucker). Coll. E. B. Williamson : 

 9^,89, Salisbury, Mashonalaud (v, vi . 1899 ; ii, iii . 1900 ; v . 1905, 

 Marshall). Coll. Ris : 1 <J , 4 9 , Botchabelo, 1200 in. (18, 23 . ii . 1914, 

 H. Junod). Brit. Mns. : Knysna, Delagoa Bay, Pretoria. 



This elegant little dragonfly is one of the characteristic spscies of 

 the present fauna. There is some variability in the single elements of 

 wing pattern in both sexes, though the pattern remains the same in 

 principle. Its range in Africa is very wide, since it has been recently 

 found in Abyssinia (though in a slightly different form, with con- 

 siderable reduction of black colour on wings, especially in male), and 

 also in the interior of Nigerian West Africa. A closely allied though 

 distinct species is found in India and South China. 



PALPOPLEURA DECEPTOR (Calvert, 1899). 



Coll. E. B. Williamson: 1 , Salisbury, Mashoualand (xi . 1900, 

 Marshall). Coll. Selys : 3 ? , Delagoa Bay. 



Somewhat different in facies from the other species of Palpopleura, 

 by the relatively longer and more slender abdomen, more elongate 

 wings with the wave in costal vein only faintly indicated ; but other- 

 wise in venational and structural characters and colour system clearly 

 congeneric. Evidently of wide distribution though rare in collections, 

 and probably to be found more in the interior of the continent than 

 on the coast disti'icts ; found North of Khartoum, West of Sikasso 

 and Zungeru. 



CHALCOSTEPHIA (Kirby, 1889). 



A genus containing only two forms, which were considered as 

 subspecies by the writer in his Libellulinae monograph, one (the 

 first described) from Madagascar, the other one from continental 

 Africa. Conspicuous by its short abdomen and elongate, comparatively 

 narrow wings; a remarkable feature of its venation is the position of 

 the proximal side of triangle in hind wing distal to arculus. Male 

 distinguished by ventral process of first abdominal segment. 



