14 



VVA KO NA KAU ARA. 



all the remaining Hemerobian forms. Moreover, since the branches of 

 radial sector, though variable in their number, undoubtedly stand in 

 important relation to the evolution of the peculiar Hemerobian type of 

 venation, I regard the above distinction into the two tribes to be justifiable. 



Tribe Neurorthini nov. 



The tribe is based on the genus Xeurorthus. Two more genera, viz. 

 NosybiLS and Sisyrclla, not improbably belong to it. The former is a 

 genus characterized by the forewing having no recurrent vein but one 

 radial sector, by the hindwing showing some gradate veinlets, and by the 

 occurrence of a short ovipositor of unknown structure in the female. In 

 the latter the forewing has neither recurrent vein nor gradate series of 

 crossveins, but has one radial sector ; the hindwing has no crossvein at all ; 

 and nothing certain is known about ovipositor. As far as the radial sector 

 goes, therefore, Nosybus and Sisyrella agree with each other as well as 

 with Neurcrthus ; and all the three may, on that account, be associated 

 together. However, our deficient knowledge concerning ovipositor in the 

 two genera referred to, precludes definitive inclusion of these in the 

 Neurorthini. 



Genus Xeurorthus Costa. 



Neurortiais Costa, Atti dell' Accademia di scienze fisiche e matematiche, i, p. 32 (1863) ; 



Banks, Trans. Amer. Ent. Soc, xxxix, p. 217 (igi3). 

 Sartcna Hagen, Ann. Soc. Ent. de France, p. 41 (1854). 



Antennae moniliform. Forewing rather broad ; subcosta runs into 

 margin of wing ; costal area not broad at base, without recurrent vein ; 

 costal crossveins mostly simple ; one radial sector ; three series of gradate 

 veinlets ; cubitus not forked near base of wing. Hindwing smaller, with 

 only one gradate series. 



Type : NturortJuis fallax (Rambur). 



Of this very interesting genus, there are two species occurring in 

 Japan. Both differ from the type species in having costal crossveins in 



