1917] The CicadellidcB of Wisconsin 85 



2048. D. abbreviatus O. & B.— Two spec, St. Croix Falls, Aug. 16, 



1916; Grand Rapids, Aug. 21, 1916. 



2049. D. stylatus Ball.— One spec.. Grand Rapids, Aug. 21, 1916. 

 2051. D. configuratus Uhl. — One spec, Pembine, Sept., 4, 1916. 



2053. D. sayii (Fh.) — Common. July and August. 



2054. D. missellus Ball. — Common. 



2055. D. weedi VD.— One specimen. Blue River, July 28, 1916. 



2059. D. compactus 0. & B. — Not common, generally distributed. 



Deltocephalus nigriventer n. sp. 



(Figs. 23, 24, 25, 26). 



Resembles D. compactus in size and form, but with unique 

 genitalia. 2.50-2.75 mm. long. 



Vertex obtusely angled, two thirds as long as width between the 

 eyes. Pronotum slightly longer than vertex, anterior margin strongly 

 convex to humeral angles, truncated posteriorly. Elytra short and 

 broad, exceeding the abdomen; venation indistinct. Face broad, 

 convexly rounded to a quadrangular clypeus; lorse semi-circular. 



Color: Two apical spots just anterior to a broad sinuate band, 

 interrupted at middle, connecting the eyes, and ocelli, black. Pronotum 

 milky gray, anterior half vaguely mottled with brown. Scutellum 

 with basal angles and median stripe black. Elytra milky gray, sub- 

 hyaline; clavus irregularly mottled with brown; a large spot each on 

 discal cell, third anteapical cell and midway on costal margin, black. 

 Nervures milky white. Face black with several pairs of pale lateral 

 arcs. Clypeus with median black stripe forming a spot at apex; lorae 

 margined with black. Venter black, segments pale margined. 



Genitalia: Female last ventral segment twice as long as preceding, 

 produced, broadly truncate, incised nearly to base; margins of incision 

 almost overlapping, roundingly angled. Ovipositors and pygofers 

 dull black, the latter beset with many short paler bristles posteriorly. 

 Male valve scarcely longer than preceding segment, obtusely pointed. 

 Plates large, broadly convex, tapering to rounded, upturned points; 

 margin and dorsal surface with pale hairs. 



Six females and two males from Merrillan, August 5, 1916, 

 and one female from Tomah, August 2, 1916, were swept from 

 small grasses. The female genitalia are decidedly unique for 

 the genus. 



2060. D. vinnulus Crumb. — Four specimens. Grand Rapids, Aug. 21, 



1916. These specimens agree exactly with cotypes from 

 Tennessee. 



2062. D. apicatus Osb. — One specimen Merrillan Jt., Aug. 5, 1916. 



2063. D. inimicus (Say)— Generally distributed. 



