440 



Island of Oahu; Trioza Janaiensis split off from T. ioJaril by 

 segregation on an island (Lanai) l)y itself and later gave rise 

 to T. puUaia; T. hawaiiensis was probably derived independ- 

 ently from the ancestral species bnt bears a closer resemblance 

 to T. ioJani than to T. ohiacoh. The latter occnrs now on both 

 Oahu and Hawaii, l)nt probably originated on the former. 



Kuirayama and Hcvaheca are derivatives here of the ances- 

 tral Trioza species. 



Key to the Species. 



A^. Genal cones not as long as vertex ; color of body typically 

 dark brown ; antennae not more than twice as long 

 as width of head, nsnally less ; cnbital vein of fore- 

 wing forked at or distad of midpoint ; costa with- 

 out visible setae. Oahu and Hawaii. 



T. oliiacola n. sp. 

 A". Genal cones as long as vertex or longer. 



B^ Costa of forewing with setae; cubitus forked at or basad 

 of midpoint; antennae twice as long as width of 

 head or more ; genal cones about as long as vertex ; 

 male forceps notched behind near apex ; color 

 usually orange or yellow. Oahu. 



T. iolani Kirkaldy. 

 B-. Costa of forewing without setae, or exceedingly short 

 ones if present ; male forceps not notched l)ehind 

 near apex. 

 C^. Genal cones longer than vertex; antennae 2^^^ to o 

 times as long as width of head ; thoracic dorsum 

 usually striped with brown ; male forceps abruptly 

 narrowed near apex. Lanai. 



T. Janaiensis n. sp. 

 C". Genal cones about as long as vertex, rarely longer. 

 D^ Color of body black, dorsum conspicuously reticu- 

 lated; antennae about twice as long as width of 

 head. Lanai. 7\ piiJJala n. sp. 



