238 



generic, are in the collection of the Sugar Planters' Experiment 

 Station, Honolulu. Except where otherwise stated they were 

 collected by the writer. 



The writer takes pleasure in acknowledging the obligation 

 he is under to W. L. Distant for comparing specimens with 

 types in the British Museum, and for the help he has given him 

 while working on Homoptera. 



Delphacidae. 



Geoneossus gen. nov. 

 Type sacchari. 



Head broader than thorax, vertex at base as wide as an eye, 

 truncate, narrowing slightly to apex, very short, about one-fourth the 

 width of base, medianly, longitudinally keeled, slight keels along all 

 edges and between vertex and face, a little pit in center of each half 

 of vertex. Face broad, widest at lower corner of eyes, then slightly 

 narrowing to apex, keels along sides, also two medio-longitudinal keels 

 from base to apex, a keel down gena from beneath the antenna to 

 base of clypeus. Clypeus a little shorter than face, in profile slightly 

 curved, sides flattened, broad at base, medianly and laterally keeled. 

 Eye as broad as face, with very deep antennal emargination on lower 

 edge. First joint of antenna slightly shorter than second, sub- 

 triangular, apex much wider than base, very flat and thin, especially 

 on outer edge; second joint subpyriform in outline, outer edge fairly 

 thick and nearly straight, inner edge thin and broadly curved in out- 

 line; other edge beset with several sense organs; arista ariising from 

 apex. Ocelli at lower corner of eye. Pronotum medially very slightly 

 longer than vertex, hind margin obtuse-angularly emarginate, medially 

 keeled, lateral keels obscure, arising anteriorly at inner hind angle 

 of eye, curving round and reaching anterior margin at hind angle of 

 eye, not reaching the posterior edge of pronotum; a pit in center of 

 each half. Scutellum distinctly tricarinate. First hind tarsal joint 

 twice the length of the other two together; spur half as long as first 

 tarsal joint, flattish, pointed, inner edge straight, outer edge convexly 

 curved, beset with small spines; hind tibiae with five apical and one 

 small basal spines. Tegmina pointed at apex; subcosta and radia 

 forking before middle, radia joining media for a short distance (no 

 radial cross-vein), first median sector arising at junction of radia and 

 media, touching cubitus (no media cross-vein), cubitus three-veined, 

 bent nearly at right-angle after joining media; clavus reaching five- 

 eighths from base. 



This genus is near to Cochise Kirkaldy, but has a narrower 

 face, with the keels separate to apex, the antennae also are 

 very distinct. 



