new and little-knoion Tipuliclse. 



103 



Somewhat larger and darker than the original Siamese 

 specimens, but identical in structure. 



Helius harbatus, sp. n. (Text-fig.) 



Closely allied to H. niffHceps, Edw., differing only in the 

 structure of the antennae and hypopygium. The antennae 

 are about as long as the head and proboscis together, the 

 first three or four flagellar joints swollen, markedly broader 

 than long, the next few joints gradually narrower but no 

 longer, all with rather short dense hair ; the last six joints 

 long and very slender (especially the last) and each provided 

 with a few long hairs, more than twice as long as the joint 



Helius barhatus, sp. n. 

 Male hypopygium from above, x 40. 



bearing them. Hypopygium : ninth tergite produced into 

 two conspicuous hairy points. The eversible anal segment 

 with four narrow chitinous strips. Tips of side-pieces with 

 long dense yellowish hair, the hairs microscopically serrate. 

 Both pairs of claspers very broad, the outer one with the 

 usual black bifid tip, and also with a double membranous 

 lobe on the inner side. 



Formosa : Arisan, 24. iv. 1917 {T. Shiraki), 1 ^ . 



Eriopterini. 



Ormosia {Rhypholophus) formosanus, sp. n. 



Head, thorax, and abdomen uniformly dark brownish, the 

 abdomen somewhat darker ; pubescence inconspicuous, pale. 

 Palpi black. Antennae dark brown, flagellar joints all 

 shortly oval. Ovipositor reddish ; genital valves long, 



