268 



clypeus and strongly curved before apex of same, sides of clypeus 

 rounded, without keels; eyes round, slightly emarginate on lower pos- 

 terior edge; first joint of antennae small, second cylindrical, little 

 longer than broad, truncate at apex, arista long. Pronotum deeply 

 and roundly emarginate on posterior margin, tricarinate, lateral keels 

 strongly diverging, sharply bent and partly interrupted just before 

 they reach the hind margin above the tegulae; scutullum more than 

 twice the length of head and pronotum, with three large carinae, 

 lateral ones diverging, reaching posterior border. Tegmina with sub- 

 costa and radia amalgamated to a little beyond middle, both with 

 short furcation near apex, media with three sectors, first arising 

 about middle of tegmen and furcate about its middle, cubitus furcate 

 about middle of tegmen, radial cross-vein from radia to near base of 

 second median sector, median cross-vein from near base of first 

 median sector to near furcation of cubitus, claval veins amalgamating 

 about one-third from base, joining commissural margin near apex; 

 first joint of hind tarsus a little shorter than the others together, hind 

 tibia with a median and a subapical spine. 



This genus is near Ommatissus but is easily distinguished by 

 the laminate keels on sides of vertex and the more complex 

 neuration of tegmina. 



(1) N. s pure us sp. nov. ( <5 9 ) 



Sordid yellow or sordid light brown; abdomen and between keels 

 of scutellum darker, two small dark marks on apex of vertex; teg- 

 mina and wings hyaline, veins yellow, beset with fine hairs on the 

 underside. Male pygophor small, slightly compressed laterally, vertex 

 and lateral edges subtruncate, dorsal edge with deep emargination in 

 which anal segment fits; anal segment very short, rounded; genital 

 styles narrow at base, gradually widened to truncate tip, apical 

 corners rounded, outer apical angle with a small outward and down- 

 ward turned spine, a small spine near apex. 



Length 2.')imn. ; tegmen i>.8mm. 



Hah. Amboina. 



Note. 



The reason for the horismology of the tegmen employed in 

 this paper is fully explained by figures 1 and 2 of Plate G, which 

 illustrates the tracheal system in the nymph and recently 

 hatched adult of Pcrl'inaiella mcrharirida. a typical Delphacid 

 tegmen. The radia and media both bend out of the straight and 

 amalgamate for a short distance, likewise the first median sector 

 (third median vein) and the cubitus, the latter taking a sharp 

 bend immediatelv afterwards: thus there are neithei- radial 



