454 



are that it is trnlj endemic since it occurs only on the native 

 pahns in the niomitains and not on cultivated pahns in the coast 

 lands. 



The species bears some resemblance to the endemic Trioza 

 species and at first was believed by the writer to have been 

 derived from the same ancestry. In wing venation and male 

 genitalia there is a similarity bnt the form of the genal cones 

 and especially the tibial armature are distinct, while in all 

 these characters there is considerable similarity to Megatnoza. 



Genus Ccrotrioza novum. 



Head scarcely declivous, rather long ; vertex produced in front into 

 two horn-like epiphyses over antennal bases ; genae produced more or 

 less into cones or subspherically swollen. Antennae slender. Thorax not 

 much arched, narrow; hind tibiae with small basal spur or callus and 

 small subapical spine. Forewings narrow, opaque or semi-opaque, macu- 

 lated ; first marginal cell usually larger than second ; hind wings nearly 

 as long as forewings. 



Type of genus: — Cerotrioza hirifiata. 



Two additional species, not yet described, are known from 

 the South Pacific — one from Borneo and another from Singa- 

 pore. The genus appears to be somewhat related to Megairioza 

 but has become very specialized in some features. The Ha- 

 waiian species is manifestly related to the other two luit hardly 

 derived from either. It is probably endemic here but its origin 

 must still be a matter of conjecture. It appears to have no 

 relationship to the other endemic species of psyllids here. 



Ccrotrioza Jjivittata n. sp. 



Length of body 1.8 mm.; length of forewing 2.2 mm. General color 

 pale greenish yellow on dorsum and venter ; eyes dark and a broad, 

 dark brown vitta alongside of head continued on pleurae of thorax to 

 base of forewings and thence along central axis of each forewing to 

 apex; legs pale yellow or straw colored; antennae whitisli, except two 

 basal segments brownish and apical two black. Body slender. 



Head scarcely deflexed, very long. Vertex longer than broad, with 

 a discal, sulcate depression on each side of median line and the two 

 meeting at median line near anterior end; with two rounded, knoblike 

 prolongations at anterior end of vertex reaching out beyond and over 

 antennal sockets, with front ocellus at base of emargination between 

 them. Frons visible as a very small sclerite bearing the front ocellus 



