238 Mr. W. F. Kirby on Dragonflies 



The specimens of 0. caffrum in the Natural History 

 Museum are from various parts of South Africa ; but 

 Prof. Calvert also records the species from Sierra Leone and 

 the Congo. 



When I published my ' Catalogue of Odonata ' I referred 

 three species to Thermorthemis — T. caffra, Burm., and 

 T. madagascariensis and angustiventris, Ramb. The second 

 species is the type of the genus ; but T. caffra, as pointed 

 out by Karsch and Calvert, is an Orthttrum (in the broad 

 sense) ; and on reconsidering Rambur's description of his 

 Lib. angustiventris, I cannot identify it with any species 

 before me, but doubt very much whether it belongs to 

 Thermorthem is. 



22. Orthetrum flavidulum, sp. n. 



Four specimens. 



Two from Pretoria (Distant), one from Rustenburg 

 (Dista7it), one from Pienaars River, March 1894 {Distant). 



Long. Corp. 34 millira. | exp. al. 53 millini. ; long. pter. 

 3|- millim. 



Female. — Yellow, the antennae, their bases, and sometimes 

 the frontal tubercle black ; two more or less developed trans- 

 verse black stripes on the prothorax, two blackish lines on 

 each shoulder, sometimes filled up with brown, and followed 

 by a brown stripe at the base of the wings above. Abdomen 

 with the basal segments scarcely broader than the others ; a 

 broad blackish stripe on each side, expanded at the ends of 

 the segments ; under surface paler yellow than above ; 

 terminal segments sometimes yellow in the middle above. 

 Legs yellow, lined with black beneath ; tarsi black. Wings 

 clear hyaline ; pterostigma yellow, between black nervures, 

 the upper one much thickened, covering two and a half cells 

 or more. Nervures brown, front of costa and at least the 

 lower series of antenodal cross-nervules light yellow. Fore 

 wings with 12-13 antenodal and 8-9 postnodal cross-ner- 

 vules ; the last antenodal continuous ; one supra-triangular 

 nervule, triangle traversed, followed by 3 cells increasing ; 

 subtriangular space consisting of 3 cells. Hind wings with 

 8-10 antenodal and postnodal cross-nervules. 



These specimens might be taken for small immature 

 females of 0. chrgsostigma, but appear to be distinct. There 

 is a specimen marked " Cape Colony " in the collection of 

 the Museum. 



