from the Transvaal and Nyasaland. 233 



10. Trithemis lacustris. 

 Trithemis lacustris, Kirb. Trans. Zool. Soc. Lond. xii. p. 329 (1889). 



Two specimens. 



Pretoria {Distant) and Zoutpansberg (Kcessner). 



In the collection of the Natural History Museum from 

 Abyssinia and Wadelai. 



T. ardens } Gerstaecker, is, perhaps, a form of this species 

 with blacker legs. 



11. Trithemis ferrugaria. 

 Libellula ferrugaria, Ramb. Ins. Ne>r. p. 82 (1842). 



One specimen. 



Pretoria (Distant). 



Apparently a rather scarce species, as the Natural History 

 Museum only possesses a single specimen from Natal. It is 

 easily recognized by the short black dashes on the middle of 

 the back and sides of most of the segments of the abdomen. 



12. Helothemis dorsalis. 

 Libellula dorsalis, Ramb. Ins. N6vr. p. 89 (1842). 



Two specimens. 



Pretoria {Distant). 



This species varies much in intensity of colour, and in 

 specimens in which the markings of the thorax have become 

 black, the yellow suffusion of the wings has generally disap- 

 peared. 



I doubt if the genus Helothemis is sufficiently distinct from 

 Trithemis. 



13. Crocothemis erythroea. 



Libellula erythrcea, BrulltS, Exp<§d. de Moree, iii. (1) p. 102, pi. xxxii. 

 fig. 4 (1862). 



Seven specimens. 



Four from Fort Johnston, Nyasaland {P. Retidall), and 

 three from Delagoa Bay {Distant). 



A widely-distributed species in South Europe, Africa, and 

 the East Indies. My Orthetrum Lorti from Somaliland 

 appears to be synonymous with it. 



14. Urothemis designata. 



Libellula designata, De Selys, Rev. Zool. (2) xxiii. p. 177 (1872). 



Two specimens. 



Fort Johnston, Nyasaland {P. Rendall). 



