396 Airnah of the Sontli African Museum. 



It is somewhat more robust in stature than the group chrysosfigma- 

 gtnneense-Ahbofli, though being often smaller in dimensions than 

 chrysostigma. Its reticulation is closer (regularly two rows Rs-Rspl) 

 and its pterostigma smaller than in those related species. Males with 

 the thorax entirely pruinose to disappearance of the whitish bands are 

 not often met with ; they may easily be identified by the peculiar 

 shape of hamuli (Text-fig. 70). 



This species is East African (North to Abyssinia) and South 

 African ; specimens formerly recorded (liy the writer) from some 

 West African stations very probably do not belong to 0. caffrum, but 

 to 0. microsUgma, an essentially tropical and chiefly West African 

 species, which was not recognised when the group was first studied 

 for the monograph. A very close ally of 0. caffrum is 0. taeniolatum. 

 found in Somalilaud and Eritrea, Mediterranean Asia and India. 



Fig. "lO.— Orihetrum caffrum, J. M'Fongcsi. Genitalia, second seg- 

 ment, left side view. 



Ortheteum chrysostigma (Burmeister, 1839). 



S. Afr. Mus. : 1 fj, 2 9 (no locality) ; 1 (^ , Livingstone, Zambesi ; 

 1 c^.Matopo, Khodesia (-28 . v . 1911, C. H. Pead); 1 ^, 1 9 , Lorenzo 

 Marcjues (26 . v, 12.xii.l911); 1 r? , MTongosi, Zululand, 

 (W. E. Jones) ; 3 J , Barberton, Transvaal. Whole of Cape Colony 

 and South West Africa. Brit. Museum : 1 <^ , Salisbury, Mashonaland 

 (iv . 1904, Marshall). Coll. K. J. Morton : 3 ^J , 1 9 , Umtali, Rhodesia 

 (19, 21 . viii, 7 . ix . 1908, Miss Fountaine). Coll. Ris : 2 9, Lorenzo 

 Marques (29 . ix, 15 . xii . 1911). Coll. E. B. Williamson: 10 c? , 

 119, Salisbury, Mashonaland (i, ii, iii . 1900, iv . 1905, Marshall) ; 

 4 S, Natal (G. F. Leigh) ; 1 cJ, Priucetown, Natal (19, ii, 1909, ifl). 



The mesepimeral whitish stripe is a good guide for the identification 

 of this species, as first indicated by P. P. Calvert. The pterostigma is 

 rather variable in size, but almost regularly smaller than in guineense, 

 Ahboiti and icferomdas, larger than in caffrum, in colour entirely 

 between the bright yellowish shades of the former three and the more 

 ferruginous colour of the latter species. Females of chrysostigma, 



