TJie Oilnnata or Dntfintijlirs nf Snutli Afr!,;,. 399 



As far as our experience goes, the area of ijuineense is much the 

 same as that of Abbott i, but the latter seems chiefly eastern, the 

 former western in distribution. 



ORTHETEUM BRACHIALE (Palisot de Beauvais, 1805). 



S. Afr. Mus. : 1 9 . Lorenco Marques. Mus. Hamburg: 1 J , Loren9o 

 Marques (17 . ix . 1911, Michaelseu). Coll. Kis : 1 9 , Eikatla, Delagoa 

 Bay (iv . 1914, H. Junod). Coll. E. B. Williamson: 3 <$, 19, 

 Salisbury, Mashonaland (iv . 1905, Marshall). 



Generally larger than the species of the chrysostigma group, which 

 it resembles by the mostly rather light coloured pterostigma ; ante- 

 rior vein of pterostigma conspicuously thickened in bmchiale more 

 often than in any other species of the group. Abdominal pattern 

 much as iu stem male capense, but with black elements reduced ; the 



FIG. 74. Orthetrum brachiale, $ . Lorenzo Marques. Genitalia, second 



segment, left side view. 



same may be stated for the thoracic pattern, at least for specimens iu 

 which the two broad lateral light-coloured stripes are obliterated by 

 age or destroyed by decomposition. The excellent group character 

 (first applied by P. P. Calvert) of colour of ante-nodal cross-veins in 

 sub-costal space is often treacherous in 0. brachiale (also sometimes iu 

 yinneense and even in chrysostigma), where mature specimens not 

 rarely have those veins much obscured, although they are con- 

 spicuously whitish in less mature specimens. For males the quite 

 peculiar form of hamuli is a guide in any case (Text-fig. 74). 



0. brachiale is chiefly an inter-tropical species, found about equally 

 in Western and Eastern regions of the African continent, also iu 

 Madagascar and some of the smaller islands. 



ORTHETRUM STEMWALE CAPENSE (Calvert, 1893). 



S. Afr. Mus. : 2 , 5 ? , Loren90 Marques (ix, xi, xii . 1911) ; 6 , 

 8 ?, MTongosi, Zululaud (ii, iii, v, xi . 1911, W. E. Jones); 13 <J , 



