588 PROCEEDiyOR OF THE XATTOXAL MUSEUM. vol.46. 



' STENOCRANUS DORSALIS Fitch. 



Plate 46, figa. 0, E, F, O; plate 49, fig. J. 



Delphax dorsalis Fitch '51 :46. — Lintner '93 :386. 



Delphax unipuncta Provancher '89 :244. 



Liburnia dorsalis Van Duzee '90 :28. 



Stenocranus dorsalis Y AS Duzee '90 :390. — Osborn '92 : 127. — Van Duzee '.9? :231. 



Stenocranus lautus Van Duzee '97 :231. — Osborn '00 : 64. 



Length of body 4 mm.; width of vertex 0.29; width of frons 0.31; 

 antennas, I, 0.08, II, 0.28. General color light yellowish brown to 

 brown; dorsum usually with a long whitish vitta extending from 

 vertex to tip of scutellum and appearing to be continued on to the 

 whitish margin of clavus when elytra are closed; vitta variable in 

 distinctness, often rather broad; frons and clypeus usually black 

 between carinse; femora and tibise striped with black; elytra usually 

 light brown, occasionally darker, with a more or less prominent 

 brown macula along membrane slightly behind middle and often 

 extending somewhat on to corium. 



Head narrower than pro thorax, strongly carinate, projecting 

 beyond eyes at apex for about one-thkd its length; vertex long, 

 narrow, about one and a half times as long as broad posteriorly; 

 frons narrowed above, slightly but quite abruptly broadened to 

 ocelli, thence parallel to apex; median carina sometimes forked a 

 little below apex of head. Antennse rather short, II three times as 

 long as I. 



Thorax long; pronotum moderately long, scarcely as long as ver- 

 tex, lateral carinj© arcuate. Legs slender; calcar large, half as long 

 as basal tarsus, pubescent. Elytra narrow, long, subhyaline. 



Male pygofers large; anal tube with two long, acute processes 

 on ventral margin; genital st3des large at base, abruptly narrowed 

 midway, thence deeply emarginate, sinuate, acute at tip. 



Female ov^ipositor sheath greatly broadened, foliaceous, closely 

 appressed to and entirely covering genital segment, elevated on 

 margins, and often covered with floccose secretion. 



Redescribed from numerous males and females, from the following 

 localities: Michigan; Polk County, Wisconsin (Baker); Illinois; 

 Pennsylvania (Wirtner) ; Massachusetts ; Maryland ; Virginia (one of 

 the two type-specimens of Van Duzee's species lautus) ; Canada and 

 Colorado (Baker). 



Stenocranus lautus was separated by Van Duzee from the present 

 species entirely on color characters, all of which are variable and com- 

 pletely intergrade when a large series is examined. The type male of 

 this species from Virginia, in the United States National Museum, is 

 identical with the numerous specimens of S. dorsalis. The name 

 S. lautus Van Duzee, therefore, becomes synon3"mous with dorsalis. 



