454 



are tliat it is triilj endemic since it occurs only on the native 

 palms in the mountains and not on cultivated palms in the coastln 

 lands. 



The species bears some resemhlance to the endemic Trloza 

 species and at first was believed ])y the writer to have beenj 

 derived from the same ancestry. In wing venation and male' 

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

 and especially the tibial armature are distinct, wdiile 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 antenna! bases; genae produced more or} 

 less into cones or subspherically swollen. Antennae slender. Thorax notj 

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

 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. 



Ti/j)(> of genus: — Cerotrioza hivittata. 



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 Megafrioza\ 

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

 waiian species is manifestly related to the other two but hardly 

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

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

 relationshi]) to tlie other endemic species of psyllids here. 



Cerotrioza hivittata n. sp. 



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

 pale greenish yellow on dor.sum 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 whitish, 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 sclcrite bearing the front ocellus 



