453 



on each side of median suture, posterior ocelli slightly elevated, anterior 

 half bulging and clothed with moderately long hairs. Genal cones short, 

 seldom more than ^ or 1-3 as long as vertex, subacute, divergent, 

 somewhat separated. Eyes very large. Antennae slender, not quite twice 

 as long as width of head. 



Thorax large, broad, well arched, surface briefly and sparsely pubes- 

 cent ; legs rather long, stout, pubescent ; hind tibiae with a spur at base 

 and two prominent teeth at apex, one bifid and one simple and a third 

 long tooth a little before the apex. Forewings large, long, hyaline or 

 very slightly smoky, with four dark spots on hind margin, one at tip 

 of clavus and the other three the regular marginal spots characteristic 

 of this subfamily but darker and more prominent. 



Abdomen long in both sexes; male forceps nearly as long as anal 

 valve, slender, narrowing slightly toward subacute apex, hairy. Anal 

 valve much broader than forceps, posterior margin convex, broadest 

 near base and narrowing distad to truncate apex. Female genital seg- 

 ment large, not as long as abdomen but often nearly so, both valves 

 acutely pointed, dorsal longer than ventral. 



Distribution: — Island of Oahu — Piinahiu (O. H. Swezej) ; 

 Waihipe, January 23, 1915 (Swezey) ; Mt. Olympus, eleva- 

 tion 2500 ft., September, 1917 (Swezey and Crawford) ; Wai- 

 ahole, August 23, 1916. 



Food plant: Fan palm (Pritcliardia spp.), native palms. 

 This species appears to occur only on the endemic palms 

 which are comparatively rare on Oahu. The insects live on 

 the younger fronds, especially those just unfolding, from which 

 they can readily suck the sap and in the folds of which they 

 find good refuge and seclusion. 



Megatiioza is a Polynesian genus, distinguished l)y the 

 armature of the hind tibiae together with certain cephalic and 

 wing characters. Thus far there are ten known species of this 

 genus^ in the Malay Archipelago and Peninsula and the Phil- 

 ippines, though there are doubtless many more to be discovered, 

 as this appears to be a large genus. Xone of these known ten 

 species shows any marked relationship to the Hawaiian species, 

 so that it is probable that the latter is derived from some other 

 still unknown species. It is possible that it may occur else- 

 where, being merely an introduction here, but the indications 



1 These species are described in a forthcoming paper on paleotropical 

 Psyllidae by the author of this paper. 



