99 



wanting, there being only birds to supply this, makes the problem 

 a puzzling one. In spite of this, the species of these flies are 

 numerous, the individuals sometimes abundant, so much so as 

 to furnish the food supply for the larvae of various Hawaiian 

 Crabronidae. 



Five species of Pipunculus (parasitic here on Delphacid leaf 

 hoppers) are known to me from Kilauea, and several of Caenosia, 

 and these with the groups previously mentioned, as well as 

 species of Lispe, Asteia, Tephritis and Sarcophaga complete the 

 Dipterous fauna. 



Throughout this paper I have used generic and specific names, 

 as published in the " Fauna Hawaiiensis, " so that it has not been 

 necessary to cite the authors. In the Hymenoptera I have used 

 the genera proposed by me subsequently for the genus Crabro 

 of that work. 



Papers. 

 On Some Peregrine Aphidae in Oahu [Hem.] 



By G. W. KiRKALDY. 



With the exception of certain Chermidae, all the Sternorr- 

 hynchous Homoptera yet observed in the Hawaiian Archi- 

 pelago appear to be recent arrivals. As is natural in families 

 so little studied till lately, many of the species cannot be 

 identified with any of those already described from other Faunas 

 and consequently their endemic habitat remains unknown. I 

 now emmierate four Aphidae occurring near Honolulu; about 

 six more are known to me, but as they belong to obscure genera 

 with many, poorly differentiated species, I have not yet positively 

 determined them, and must leave them for a future communica- 

 tion. 



Several of these species are of considerable economic import- 

 ance, Myzus citricidus doing much damage to Orange trees, 

 whilst Aphis sacchari is a pest of Sugar-cane. 

 Aphis Linnaeus. 



1758 Systema Naturae, Ed. 10, p. 451. 

 1. sacchari Zehntner. 

 Aphis sacchari Zehntner 1897 Arch. Java Suiker. V. p. ? and 

 1901 op. c, IX (sep., p. 1) PI. I f. 1-10; Kriiger 1899 Das Zuck- 

 errohr und seine Kultur 313. • 



