34G Tttt Canadian entomologist. 



mate on the margin, light. Pronotum shining black, a row of submarginal 

 spots, sometimes a median line, and the posterior margin narrowly light. 

 Scutellum black, the lateral margin interruptedly light. Elytra subhyaline 

 white, veins milky. Sometimes in the male the disc of the elytra is dark- 

 ened up, omitting the cross nervures and the apices of the claval veins. 

 Face black, with margins and arcs on the front light. 



Genitalia : ultimate ventral segment of the female twice longer than 

 penultimate ; lateral margin roundingly narrowing ; posterior margin 

 truncate, curved around pygofers ; male valve rather large, obtusely 

 angulate ; plates as wide as the valve, roundingly narrowing to the 

 slightly produced, acuminate, points. 



Described from eight specimens from Ames, Iowa; taken by the writer 

 on a i^atch of" dog-hair" Juncus growing on the margin of a pond. 



Cicadula potoria, n, sp. — Form and general appearance oi D. gnarus. 

 Smaller and darker than any, other described Ciaidula. Length, 5 2.5 

 mm., $ 2.25 mm. 



Vertex nearly right-angled, twice as long on middle as at eye, half 

 wider than long, margin rounding, apex conical, front narrow, wedge- 

 shaped, the margins straight. Pronotum slightly longer than vertex. 

 Elytra considerably longer than the body, obtusely rounding behind. 

 Venation strong, apical cells long, curved, outer branch of first sector 

 obsolete, two anteapical cells. 



Colour : female — vertex dark fuscous, the margins, a median line and 

 two dashes on either side, yellow, the posterior dash almost enclosing a 

 round black spot ; front brownish, with fuscous arcs ; lower part of face 

 yellow, with sutures and a stripe on clypeus fuscous . Pronotum and 

 scutellum yellow on margins and fuscous on discs, omitting a yellow longi- 

 tudinal stripe. Elytra milky subhyaline, sometimes mottled with fuscous 

 on disc. Male — often the same colour and marking as female; sometimes 

 darkened up until all the light markings are gone except a triangle across 

 face above antennse. 



Genitalia: ultimate ventral segment of female short and straight, or 

 slightly waved posteriorly ; pygofers very short and thick ; male valve 

 short, oval ; plates triangular, their apices produced into long, divergent, 

 style-like, upturned processes. 



Described from ten specimens taken from Juncus, along with D. 

 gnarus, at Ames, Iowa. 



