445 



veins and custa willKuit visible setae or witli very siiort setae. Female 

 genitalia similar. Male forceps nearly or ciuite as long as anal valve, 

 stout, uniformly converging on both margins to subacute ape.x, black 

 pointed; anal valve short, posterior margin acuately rounded, broadest 

 near mid-point. 



I)istril)nti(iu : — Island of Hawaii — Kilaiica, ucai- N'olcauo, 

 4000 ft. elevation, Angnst 21, 1017 (W. M. Giffard) ; Kau 

 Eoad, -Jannary 16, 1917 (Giffard) ; Kahnkn, -lannary 15, 

 11)17 (Giffard); Kilanea, Jnne 27, 1017 ( O. II. Swezey), on 

 ohia lelina; Xiulii, May 22, 1017 (Swezey). 



This apjx'ars to be eloscdy related to T. ioJanl Imt never- 

 theless not a derivative of it. It is more probably a eorelated 

 derivative form of the ancestor of both. It seems to l)e limited 

 to the Island of Hawaii. Large individnals of T. lohini. eiiual- 

 ling in size this present species, occur on Oaliii but these 

 differ sharply in male genitalia, costal setae and other minor 

 characters. 



Genus Kiiirayama Crawford. 



The chief distinguishing characteristic of this genus is the 

 absence of genal cones, the genae beneath the antennal scx'kets 

 being more or less roundly swollen but not produced into coni- 

 cal processes as in Trioza. The form of the genae in this sub- 

 family appears to be not at all lixed but varies more readily 

 than wing characters and some others. For this reason, it 

 seems certain that the species placed in this genus from various 

 countries of the world do not represent a common origin at 

 all, but independent or parallel evolution toward the same end. 



The three species of this genus, native to these Islands, 

 seem almost certainly to have l)een derived from some Trioza 

 species, probably T. oliiacula or an ancestral type preceding it. 



