94 Mr. James Edwards' Synopsis of 



Stiroma ndelpha, Fieb., Cicad. d'Eur., pt. iv., 91, 1. 

 S. albomarginata, Scott, Ent. Mo. Mag., vii., 74, 4. 



^ . Crown and face brownish yellow, keels white, pronotum 

 wliite, scutellum dirty yellow, elytra pitch-black, hind margin 

 broadly white, abdomen pitch-black with a fine pale dorsal line. 

 Crown, pronotum, and scutellum subequal in length. Elytra about 

 one-half as long as abdomen, subtruncate at the apex. Styles 

 spreading horizontally, triangular, acuminate. 



? . Similar to the male, but shorter elytra and the black 

 coloration replaced by yellow-brown. Length, 2 — 2^ mm. 



Macroptcrous form. — Scutellum somewhat convex, more than 

 twice as long as pronotum, transversely impressed behind, side 

 keels wanting. Elytra nearly twice as long as abdomen, fasco- 

 hyaline, nerves yellow, the marginal nerve of the membrane 

 brown. Length, 3^ — 4 mm. 



Common. 



2. Stiroma borealis, J. Sahl. 



Ditropis borealis, J. Sahl., Not. Fenn., xii., 477, 4. 



Delphax moesta, Flor, Rhyn. Liv., ii., 80, 25. 



Ditropis moesta, Fieb., Grundz. Delpli., t. 8, fig. 18 

 ( (? genitalia) . 



Stiroma moesta, Scott, Ent. Mo. Mag., vii., 74, 5 ; 

 Fieb., Cicad. d'Eur., pt. iv., 92, 2. 



(^ . Very similar to the last species in size and colour. Styles 

 diverging, moderately curved, pointed, their inner margin strongly 

 bisinuate, outer margin simple. 



5 . Pale brownish yellow, facial keels and hind margin of 

 elytra white. 



Macroptcrous form (female). — Scutellum pitch-black, its keels 

 obsolete. Elytra much longer than abdomen, hyaline with a faint 

 brownish tinge, nerves brownish. Abdomen black or pitch-black. 



In the synonymy of this species and the preceding I 

 follow J. Sahlberg. 



8. Stiroma pteridis, Boh. 



Delphax pteridis. Boh., Sv. Ak. Handl., 115 (1852) ; 



Stal, Ofv., 197, 14 (1854); Marsh., Ent. Mo. 



Mag., i., 201, 4. 

 Ditropis pteridis, Fieb., Grundz. Delph., t. 8, fig. 18 



(^ genitalia) ; Kirschb., Cicad., 42, 2. 

 Stiroma i)teridis, Scott, Ent. Mo. Mag., vii., 73, 3 ; 



Fieb., Cicad. d'Eur., pt. iv., 94, 3. 



