70 H. L. DOZIER Vol. XXII, No. 3 



median vitta that runs from the vertex, over the thorax and 

 scutellum, and is continued on the elytra by the pale com- 

 misural nervures. The legs are usually lineated with fuscous. 



The genus may be briefly characterized as follows: Body slender, 

 rather long. Head together with the eyes narrower than pronotum; 

 vertex more or less elongate, slightly converging to apex, somewhat 

 rectangular, and produced from one-fourth to two-thirds its length 

 beyond the eyes; frons long and narrow, slightly broader at apex than 

 at base, tricarinate. Eyes more or less compressed, not deeply emargi- 

 nate below. Antennae rather short, first segment shorter than the 

 second, the latter usually somewhat tuberculate. Thorax slender; 

 lateral carinse usually attaining the hind margin; scutellum tricarinate. 

 Calcar tectiform, the margins usually rather close together with 

 pubescence between. Female ovipositor sheath subcylindrical, often 

 broadened or foliaceous and appressed to genital segment. Probable 

 type of genus is Stenocranus minutus Fab. 



From the present study it seems that the final criterion for 

 specific determination in most of the species is an accurate 

 figure of the male genitalia. This character is constant within 

 the species and quite distinctive. 



Figures I and II are the work of Wm. P. Osborn of Syracuse 

 University. 



KEY TO THE SPECIES OF STENOCRANUS. 



1. Calcar usually large and foliaceous; vertex much produced beyond eyes. . . .2 

 Calcar not unusually large, seldom foliaceous; vertex shorter 3 



2. Frons pale, with a brown band below antennae; first antennal segment 



only a little shorter than the second palaetus V. Duzee 



Frons without band; first antennal segment about as long as the second, 



longicornis Dozier 



3. Female ovipositor sheath broadened conspicuously, not styliform or 



cylindrical 4 



Female ovipositor sheath more or less cylindrical, at least on apical 

 two-thirds 8 



4. Frons narrowed above, sides subparallel from ocelli to apex; vertex not 



produced more than one-third its length beyond eyes 5 



Frons broadest at apex, sides uniformly diverging from base; female 

 ovipositor sheath less foliaceous, narrower 7 



5. Vertex not more than one and a half times as long as broad posteriorly; 



frons usually less than three times as long as broad 6 



Vertex at least twice as long as broad; frons narrow, fully three times as 

 long as broad, or more, black between carinae angustus Crawford 



6. Female ovipositor sheath broadly elliptical, broadest midway; frons 



usually black between carinae dorsalis Fitch 



Female ovipositor sheath slightly narrower, broadened apically, not as 



closely appressed as in dorsalis vitlatus Stal 



Female ovipositor sheath broadest apically, pyriform; frons pale brown 



between carinae; vertex and frons relatively shorter felti V. Duzee 



7. Vertex produced considerably more than half its length before eyes, 



beak-shaped, fully four times as long as broad rostrifrons Crawford 



