442 



(elevation 1500 ft.), 65 specimens collected by W. M. Giffard 

 and others by Swezey mostly in the months of December and 

 Jamiary; Pacific Heights, May 30, 1905; Palolo Hills; Wai- 

 lupe, January 23, 1915; Opaenla, March 30, 1913; Kuli- 

 onon; Mt. Kaala (at elevation of 1500 ft.); Kanmnohona. 



This and the following are the two most common species 

 on Oalin, and may be found at most any season of the year on 

 leaves of Oliia lehiia (Mefrosideros polymorpha). 



Tr'ioza oliiacola n. sp. 

 This species appears to be very close to T. iolani and, in 

 fact, more or less grades into it. The habitat and the food 

 plant are the same and both are found on the Island of Oahn. 

 Although the two species are found together and resemble each 

 other, there are nevertheless differences sufficient to indicate 

 that they are distinct species. 



In average size of body and wings T. oliiacola is a little smaller than 

 the other and differs in the following characteristics : — General color 

 typically much darker, usually dark reddish or chocolate brown, but 

 sometimes light reddish or light brown or even orange yellow (the 

 latter seem to be newly emerged adults) ; legs and antennae usually all 

 or nearly all brown or chocolate colored. 



Head narrower than in T. iolani ; vertex with shallower discal depres- 

 sions ; genal cones usually about two-thirds as long as vertex, but some- 

 times more than two-thirds or rarely as long as vertex; antennae 

 seldom twice as long as width of head, usually about i^ to i3/^ times 

 as long. Thorax much more distinctly reticulated. Legs similar, less 

 stout. Forewings usually clear, radius shorter than in T. iolani: cubitus 

 forked at or distad of midpoint ; costal setae much smaller, not easily 

 visible. 



Male forceps nearly or quite as long as anal valve, converging (in 

 lateral view) gradually from near base to narrowly subacute apex, not 

 as broad as in T. iolani; anal valve broadest at center, posterior margin 

 angulately convex. 



Distribution : — Island of Oahu — Alewa Heights, Pacific 

 Heights, Mt. Tantalus, Kuliouou, Kanmnohona, Lanihuli, Pa- 

 lolo Hills, Palolo Crater, Mt. Kaala (at elevation of about 

 1600 ft.). Island of Hawaii— Xiulii, May 19, 1917 (Swe- 

 zey), on ohia lehua ; Kilauea, June 27, 1917 (Swezey), on ohia 

 lehua and also some collected at same locality by W, M. Gif- 

 fard (m August 21, 1917. The food plant in all cases seems 

 to be ohia lehua (Mefrosideros spp.). 



