British Homoptera-Cicadina. 95 



^. Shining black, head, pronotnm, and legs yellow. Elytra 

 rather more than half as long as abdomen. Mouth of pygofer 

 rhomboidal, upper notch angular. Styles black, spreading, acumi- 

 nate. Anal tube white. 



• 5 . Generally somewhat paler than tlie male, sometimes 

 entirely brownish yellow. Elytra one-third as long as abdomen. 

 Length, 2h — 3 mm. 



Macropterous form (female) . — Elytra livid, brownish at the base, 

 nerves yellowish. Length, 4:^ mm. 



On Ptcris ; common. The macropterous form rare. 



4. Stiroma affinis, Pieb. 



Stiroma affinis, Fieb., Grundz. Delph., 531, 1, t. 8, 

 fig. 18 (details) ; Cicad. d'Eur., pt. iv., 96, 5 ; 

 Scott, Ent. Mo. Mag., vii., 73, 1. 



S. 7iasalis, Dougl., sec. spec. comm. 



3". Fore parts dirty greyish yellow, abdomen yeilow-brown, 

 darker on the sides, a black patch on each side of the frons 

 adjoining the clypeus (occasionally confluent), and another on each 

 side of the scutellum beyond the side keels, and the claw-joints 

 black. Crown a little longer than pronotum, which is about one- 

 third shorter than the scutellum. Elytra about one-third as long 

 as abdomen, subtruncate behind. Mouth of pygofer pyriform-oval. 



5 . Yellowish white, with the usual black markings on the 

 frons and scutellum, and generally a dark stripe down each side of 

 the abdomen. 



Macropterous form (female). — Crown and face yellow-brown, the 

 dark marking at the apex of the frons faint and ill-defined, 

 remainder of the body dark piceous. Scutellum at least twice as 

 long as pronotum ; its side keels obsolete, subparallel. Elytra 

 one-thu'd longer than abdomen, fusco-hyaline ; nerves fine, brown. 

 Length, 3| — 4 mm. 



Not uncommon in woods. 



5. Stiroma bicarinata, H.-Scff. 



Delphax bicarinata, H.-Scff., Deuts. Ins., 143, 21. 



D. nasalis, Boh., Sv. Ak. Handl., 41, 11 (1849) ; Flor, 



Rhyn. Liv., ii., 78, 24 ; Marsh., Ent. Mo. Mag., 



i 227 7. 

 D. mutahilis. Boh., Sv. Ak. Handl., 43, 3 (1849). 

 Stiroma mutahilis, Fieb., Grundz. Delph., 15, 2, t. 8, 



fig. 18 ( S genitalia). 



