396 Annals of the South African Museum. 



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

 quineense- Abbott i, though being often smaller in dimensions than 

 chrysostiyma. Its reticulation is closer (regularly two rows Rs-Rs2il) 

 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-tig. 70). 



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

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

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

 to 0. microstignw, 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 Somaliland and Eritrea, Mediterranean Asia and India. 



FIG. 70. Orthetrum caffrum, $. M'Fonofosi. Genitalia, second seg- 

 ment, left side view. 



ORTHETRUM CHRYSOSTIGMA (Burmeister, 1839). 



S. Afr. Mus. : 1 $ , 2 $ (no locality) ; 1 $ , Livingstone, Zambesi ; 

 1 c?,Matopo, Ehodesia (28 . v . 1911, C. H. Pead) ; 1^,1 9 , Loremjo 

 Marques (26 . v, 12 . xii . 1911) ; 1 ^ , M'Fongosi, Zululand, 

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

 and South West Africa. Brit. Museum : 1 <$ , Salisbui'y, Mashonaland 

 (iv . 1904, Marshall). Coll. K. J. Morton : 3^,1?, Urn tali, Ehodesia 

 (19, 21 . viii, 7 . ix . 1908, Miss Fouutaine). Coll. Eis : 2 9 , Lorei^o 

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

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

 4 (J, Natal (G. F. Leigh) ; 1 <? , Princetown, Natal (19, ii, 1909, id.). 



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 gidneense, 

 Abbotti and icteromelas, larger than in caffnnn, in colour entirely 

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

 ferruginous colour of the latter species. Females of chrysostigma, 



