2l8 ENTOMOLOGICAL NEWS. [Sept., '03 



17. Peritheniis doniitia. One female. 



18. Pajitala flavesceyis. One male captured and other speci- 

 mens seen. 



19. Diplax vicina. A few teneral specimens in July, not 

 seen again a month later. 



20. Trithemis berciiice. A single female. Registering this 

 species as Trithemis needs justification, when very competent 

 American observers have already removed it to Micrathyria. 



The main character by which Micrathyria has been separated 

 from (American) Trithemis, is the separate origin of the upper 

 sector of triangle in hind wings. But a very homogeneous 

 and natural association of species — a good genus — can be 

 obtained, when another neural character is added ; in what I 

 consider now as true Micrathyria, — about 15 distinct species 

 are known to me — there exists always a supplementary nervule 

 between the principal sector (MJ and the "bridge" besides 

 the normal one, which always in Libellulinae precedes the 

 "oblique vein." I am indebted to Messrs. Comstock and 

 Needham's well-known paper on the wings of insects for the 

 knowledge of the taxonomic importance of this region. This 

 supplementary nervule, which in German terminology I called 

 the " Antenodal-Briickenquerader, " is absolutely character- 

 istic for typical Micrathyria (^didyma, septima, hageni, cequa- 

 lis, debilis, etc.) ; it is always absent in Trithemis. Absent it 

 is in berenice, and so I believe berenice cannot remain with 

 Micrathyria, notwithstanding its separated triangular sectors 

 in the hind wings. The same condition of neuration — sepa- 

 rated sectors, supplementary nervule absent —exists in other 

 species, as in the Amazonian Ti'ith. attenuata Kby. and the 

 wide-ranging Trith. minuscula. There seem to exist sufficient 

 reasons why such species should not be separated from Tri- 

 themis, and so the right place for berejiice too may be this 

 genus. An undescribed Amazonian species in the de Selys' 

 collection and perhaps even attenuata are possibly its nearest 

 relatives. 



I have to add a word on the generic name of Ti-ithe^nis. It 

 is possible and advisable to separate Old World from American 

 Trithemis. (I know that this is the opinion of such an 



