DIPTERA II 



Fam. STRATIOMYIDAE. 



Sargus Fabricius. 



(i) Saj-giis, n. sp. 



Five specimens belonging to this genus are recorded but not described by 

 L. O. Howard from Hawaii (Proc. Ent. Soc. Washington, Vol. iv. No. 4, p. 490, 

 July 1901). 



Fam. SCENOPINIDAE. 



ScENOPiNUS Latreille. 

 ( I ) Scenopimis niger Mg. 



Two females labelled "Hotel, Honolulu, 12. iv. 1892" agree tolerably well with 

 European specimens of this species. 



Note : — With the exception of the unidentified species of Sai'gus mentioned above 

 and the Dolichopodidae this is the only fly belonging to the section Brachycera of the 

 Sub-Order Orthorrhapha obtained by Mr Perkins in these islands, and even it is 

 evidently introduced. It seems curious and perhaps significant that the large Families 

 Asilidae, Bombyliidae and Empidae should be totally unrepresented. The absence of 

 Tabanidae is not surprising, seeing that there are no indigenous Mammals. 



Fam. DOLICHOPODIDAE. 



Gn.amptopsilopus Aldrich. 



(i) Gnamptopsilopns patellifer Thomson. 



Psilopus patellifer Thomson, Eugenics Resa, Diptera, p. 507. [Guam, Marianne 

 Islands.] 



Hab. Oahu, Waianae Mts., two males and twelve females, April 1892, on plant 

 called Popolo ; si.x males and nine females, Waialua, Koolau range, April 1892, on 

 Popolo. — Hawaii, four females, Kona, 1500 ft., September 1892. 



The Hawaiian examples correspond very well with Thomson's description. There 

 is, however, in the latter no mention made of a peculiar structure situated in the hind 

 tibiae of the male, at about one-fourth from the base. At this point the tibia appears, 

 when seen from the side, to be swollen and distinctly grooved externally, and when 

 seen from behind to be slightly bowed outwards and furnished inside the bend with a 

 row of very short, erect bristles. The colour is much darker in the neighbourhood of 

 this distortion, and hence the tibiae appear brown-ringed, even to the naked eye. 



