234 



PROCEEDINGS OF THE ACADEMY OF 



[1899. 



The al)ove-quoted males are more like ardens than lacustris, 

 although somewhat smaller and with slightly fewer anteuodals 

 than the former. Gerstpecker' s description being briefer than Mr. 

 Kirby's, it is not possible to determine whether the following 

 features, in which these two males from Stony brook and from 

 Abyssinia differ from lacustris, also exist in the typical ardens : 

 front wings Avith internal triangle three-celled (instead of two), 

 hind wings with 8-12 postnodals, three or four posttriangular 

 cells, then two rows for two cells, then three rows increasing. It 

 may be noted that Mr. Kirby (1898, L c.) cites lacmtris from 

 Pretoria and Zoutpansberg in the Transvaal, from Wadelai and 

 from Abyssinia. 



7. Croeothemis erythraea Brulle. 



Synonym. Orthetrum Lorti'K.ivhj, Proc. Zool. Soc. Lond., 1890, p. 

 5-22 ; Ann. Mag. Nat. Hist. (7), ii, p. 233, 1898. 



Three males, four females, Berbera, July 4 and 5, 1894, One 

 male, Lafarok, July 13, 1894. 



All eight individuals have the sectors of the triangle of the 

 hind wings slightly separated at their origins, the maximum dis- 

 tance between them being about .2 mm. 



Trans. Zo51. Spc. London, xii, p. 329. 1889. 



