The Odonata or Dragon jHes of South Africa. 433 



sheen to about half way between distal angle of t and nodus ; limits of 

 black colour sharp, lacerate. Both wings faintly greyish yellow between 

 triangular region and apex in very mature specimens. Anal margin of 

 hind wings contracted at apex of anal loop, very broadly rounded proxi- 

 mally. Two rows of cells between Rs -Rspl. Pterostigma very small, 

 blackish to ferruginous. Body black, dull ferruginous on face, sides of 

 thorax and of basal segments of abdomen ; frons metallic violet or blue. 

 Female shorter in body and with comparatively broader wings ; otherwise 

 the sexes very similar. $ , Abd. 19, hdw. 27, pt. T5 mm. to 22, 30, To. 



9,16, 25, 1 to 19, 30 > 1 . . ... Rh. semihyalina. 



2. Colour on wings wholly black with metallic violet sheen. Two rows of 

 cells between Rs-Rspl. Black to middle of pterostigma in front wing, 

 to distal end of pterostigma, and at anal margin narrowly to apex 

 in hind wing ; anal margin from anal angle to a little beyond N^ 

 narrowly hyaline in both wings ; hyaline incomplete transverse bands 

 at distal side of t, and distally from nodus ; group of hyaline cells with 

 black along the veins in anal field of hind wings at both sides of A. 2 ; 

 vestiges of 2 or 3 longitudinal subhyaline bands between proximal 

 margin and A 3 in hind wing. Pterostigma black. Body black ; frons 

 metallic blue, face dull olivaceous. Female similar, but with hyaline 

 parts of wing pattern more extended. $ , Abd. 18, hdw. 25, pt. 2 mm. 



o i 1Q ; 23, 2 ......... Rh. fenestrina. 



Wing bases light golden yellow, with an intricate pattern of blackish 

 bands and spots distally to nodus in front wing, to one-third the distance 

 between nodus and pterostigma in hind wing. One row of cells between 

 Rs-Rsjil. Pterostigma very small, greyish ochreous. Body black with 

 metallic green reflections ; a light yellow transverse line on sutiire of 

 frons and postclypeus. Female very similar to male. & , Abd. 18, hdiv. 

 23, pi. 15 mm. $ , 16, 24., To Rh. mariposa. 



RHYOTHEMIS FENESTRINA (Rambur, 1842). 



S. Afr. Mus. : 1 (J , N. Ovampolaucl, Otiembora (20 . xi-3 . xii . 1887, 

 A. W. Erikson). 



A species from tropical Africa, West and East, evidently not a 

 common one, and known by a limited number of specimens. The 

 present male is similar to others from Sierra Leone and Nigeria. 



RHYOTHEMIS MARIPOSA (Ris, 1913). 



S. Afr. Mus. (and Coll. Ris): 3 <?, Otiembora (xi . 1887, A. W. 

 Erikson). Brit. Mus. : 1 ? , N.E. Rhodesia, 4700 it, (1904). 



The specimens here recorded are all that is known of this most 

 elegant small species. 



RHYOTHEMIS SEMI-HYALINA (Desjardins, 1832). 

 S. Afr. Mus.: 1 c?,2 ? ,Lorenco Marques (30. ix, 29 . xi,12 .xii . 1911) ; 

 1 cJ, Inhambane (xii . 1912, K. H. Barnard); 1 , 1 9 , Boksburg, 



