HEMIPTERA— CICADELLIDAE (JASSIDAE). 



179 



This species is distinctly more slender than discigutta Walker, with which 

 it has some characters in common. 



Stirellus Osborn and Ball. 



Stirellus (subgenus) Osborn & Ball, Ohio Nat., II, p. 250 (1902). 



Stirellus Sleesman, Ent. Am., X, p. 124 (1930). Genotype S. bicolor Van D. 



In this genus as here recognised the vertex is long and angular, though not 

 always as long at middle as between the eyes, the elytra with three anteapical 

 cells, one cross-nervure from inner sector to claval. They are insects of small 

 size and similar to Deltocephalus in general facies. 



18. Stirellus pacificus, n. sp. (Text-fig. 12). 



Head wider than pronotum, vertex three-fourths as long as width between 

 eyes, obtusely angulate ; front long narrowing uniformly to base of clypeus ; 

 clypeus about twice as long as width at base 

 and much narrowed at apex ; lorae long, 

 rather narrow, nearly reaching margin of cheek ; 

 cheek broad, broadly subangulate ; pronotum 

 arched before, lateral margins short, hind 

 border concave. Elytra longer than abdomen, 

 outer sector twice forked, inner apical areole 

 large, stylate at tip, appendix narrow, extend- 

 ing to tip. Female last ventral segment long, 

 concave behind ; male valve very short, plates 

 broad at base narrowing abruptly from middle 

 to acuminate tips. 



Light grey, vertex with two transverse 

 discal spots and faint oblique dots near apex ; 

 front with faint lateral arcs. Tergum black 

 margined with yellow, venter black, last ventral segment pale 

 with whitish setae. 



Length : female, 3 mm. ; male, 2-75 mm. 



Twenty-one specimens : six females (holotype and paratypes), four males 



(allotype and paratypes) Tutuila, Pago Pago, 9-9-1923, Swezey and Wilder ; 



ten specimens (paratypes), one female and five males, Malololelei, Upolu, 2,000 ft., 

 II. 4—2 



Text-fig. 

 n. sp. 



12. — Stirellus 

 a, dorsal view 



pacificus, 

 b, face ; 



c, female, and d, male genitalia. 



Pygofer black 



