Jan., 1922 synopsis of the genus stenocranus 71 



8. Male pygofer rather long and narrow, with ventral margin deeply and 



acutely angled emarginate; genital styles long and slender, .breviceps Dozier 



Male pygofer comparatively small; genital styles large at base, narrowing 

 only slightly beyond middle and enlarging distad, with inner tip pointed, 



croceus Van D. 



Male pygofer medium sized, excavated into a large median spur and two 

 lateral ones; anal tube with a long sharp median process on ventral 

 margin hinei Dozier 



Male pygofer large, ventral margin roundingly emarginate; anal tube 

 long, produced ventrad into two much longer processes than in dorsalis; 

 genital styles large, constricted one-third of length from base, distal 

 third converging to acute apex similis Crawford 



Stenocranus dorsalis Fitch. 

 (1851 Homop. N. Y. St. Cab., p. 46). 



Many species bear a close resemblance to dorsalis and are 

 often confused with it on superficial examination. The gen- 

 italia are quite distinct and characteristic in both sexes and 

 afford the most sure means of specific determination. 



Head narrower than pronottim, strongly carinate. Vertex long and 

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

 duced about one-third its length beyond the eyes. Front long and 

 narrow, narrowed above, slightly but quite abruptly broadened to 

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

 below apex of head. Antennas rather short, the second segment three 

 times as long as the first. Pronotum moderately long, scarcely as long 

 as the vertex, lateral carinas arcuate, attaining the hind margin. Scu- 

 telltun about twice as long as pronotum, tricarinate. Elytra long and 

 narrow. Calcar large, half as long as the basal tarsus, somewhat 

 pubescent. 



General color light yellowish-brown to brown, the dorsum iisually 

 with a long whitish vitta that extends from the vertex to the tip of 

 scutellum and is continued by the whitish margin of the clavus when 

 the elytra are closed; this vitta is variable in distinctness and width. 

 Front and clypeus with the intra-carinal spaces black. Antennae pale. 

 Elytra usually subhyaline, light brown, occasionally darker, with a 

 more or less prominent brown macula along membrane slightly behind 

 middle and often extending somewhat on to corium. Sexes similar in 

 coloration. Legs pale; femora and tibise striped with fuscous. 



Female ovipositor sheath greatly broadened, foliaceous, closely 

 appressed to and entirely covering genital segment, elevated on margins, 

 and often covered with fioccous secretion. 



Male pygofer large; anal tube with two long, acute processes on 

 ventral margin; genital styles large at base, abruptly narrowed midway, 

 thence deeply emarginate, sinuate, acute at tip. 



Length of body, 2.50-3 mm. ; length to tip of el}d:ra, 4.50-5 mm. 



Redescribed from a large series from many states. This is 

 our most common and most widely distributed species of the 

 genus, being found abundantly on sedges over most of the 

 United States and Canada. 



