426 Annals of the South African Museum. 



TRITHEMIS ANNULATA (Palisot de Beauvais, 1805). 



S. Afr. Mus: Kaapmuiden, Transvaal (xi . 1918, Tucker); 1 9, 

 Lorenco Marques (28 . xi . 1911). Coll. Bis : 1 <J , /&. (15 . xii . 1911). 

 Coll. Selys : 1^,2$, Delagoa Bay. 



The area of this species is nearly the same as of arteriosa, i. e. 

 continental Africa between Algeria, Egypt and Delagoa Bay, Syria, 

 Arabia and the Cape Verde Islands ; it is recorded from Sicily and 

 Sardinia (doubtfully from continental Italy), whereas arteriosa is not 

 known to inhabit Europe ; from Madagascar also we have seen 

 annulata but not arteriosa. In South Africa it is evidently much 

 less at home than arteriosa, and the small number of specimens here 

 recorded may indicate its extreme southern limits. 



TRITHEMIS PLUVIALIS (Forster, 1906). 



Brit. Mus. : 1 9 , Chirinda Forest, Gazaland, 4000 ft. (19.x. 1905, 

 Marshall). Coll. E. B. Williamson : 6 , 4 9 , Salisbury, Mashonaland 

 (iv . 1900 ; iii, iv . 1905, id.). 



Originally described from a single male specimen from Usambara; 

 the description applies perfectly to our specimens. The species appears 

 certainlv distinct, having characters in common with annulata as well 

 as with Distanti, as shown in our tables ; the stature and outline of 

 abdomen is much like Distanti. The form of genitalia in second 

 segment of male differs from annulata (and arteriosa) by having the 

 posterior margin of the basal piece of hamule distinctly angulate and 

 the genital lobe considerably narrower, sickle- shaped, resembling the 

 same organ of T. Distanti. None of our specimens is fully mature. 



TRITHEMIS KIRBYI ARDENS (Gerstacker, 1891). 



S. Afr. Mus. : 1 (J (no locality) ; 1 9 , Victoria Falls (1904, 

 W. L. Sclater); 1 (J , 1 ? , Bulawayo (C. H. Pead) ; 1 9, Salisbury 

 (23 . xii . 1911) ; 1 9 , Waterval, Transvaal (15 . iv . 1900) ; 2 <J, 1 9 , 

 M'Fongosi, Zululand (iii, x . 1911, W. E. Jones); Usakos, S.W. 

 Protectorate (ii . 1920, Tucker). Coll. K. J. Morton : 1 , Macequece 

 (2.x. 1908, Miss Fountaine). Coll. E. B. Williamson : 1 $ , Natal 

 (G. F. Leigh). 



This brilliant and conspicuous species is known from the African 

 continent south of the desert belt, although probably absent in the 

 equatorial forest zone and evidently more adapted to desert regions. 

 It is also recorded from Madagascar and the Comoro Islands. In the 

 material under discussion only a form of female with almost hyaline 



