MCNEILL REVISION OF THE TRUXALIN^ OF NORTH AMERICA. 1 99 



1.2 Posterior margin of the metazone distinctly or strongly angulate. 

 Pronotum never shorter than the head, generally plainly longer 

 (viewed from above). 



J.' Median carina of the pronotum cut behind the middle of the pro- 

 notum. Vertex of the head destitute of a median carina. Pos- 

 terior margin of the metazone very obtusely angulate 



29. — Ercnunis, n. gen. 



J. 2 Median carina of the pronotum cut more or less plainly in front of 

 the middle, never behind. Summit of the head furnished with a 

 more or less distinct median carina which sometimes extends 

 nearly or quite to the tip of the vertex and is most distinct on the 

 posterior part of the scutellum. Posterior margin of the meta- 

 zone strongly angulate. 



K.' Lateral lobes of the pronotum furnished with a single or double 

 series of short irregular and sometimes indistinct carin?e which ex- 

 tend from about the middle of the anterior margin toward or to the 

 upper posterior angle; also with a second more distinct, low, broad, 

 light-colored carina which extends from the middle of each lobe 

 toward the lower posterior angle. Sometimes this carina is dis- 

 tinct only at the anterior end. Face nearly perpendicular, rarely 

 very moderately inclined. Frontal costa sulcate throughout, acu- 

 minate at the vertex and regularly divergent below 



30. — St i rap I c lira, Scud. 



K.2 Lateral lobes of the pronotum destitute of carina. Face distinctly 

 and considerably oblique. Frontal costa not sharply acuminate 

 above and scarcely sulcate at any point. . . .31. — Psolocssa, Scud. 



L RADINOTATUM,*n. gen. Fig. i. 



Sexes very unequal in size. Body very slender and considerably 

 compressed. Head plainly longer than the pronotum, elongate pyra- 

 midal with the occiput and vertex in the same plane, ascending, the 

 face extremely inclined and, viewed from the side, decidedly sinuate. 

 The vertex in front of the eyes is about as long as the eyes, somewhat 

 longer than broad with the lateral margins parallel, and suddenly and 

 roundly acuminate in front where they form an angle a little greater 

 than 90 degrees. The margins of the vertex are not raised, but are 

 extended horizontally into lamellae which are wider anteriorly where 

 they equal the lesser diameter of the eye. The scutellum of the ver- 



"^VadivOXaXOV y a very slender thing. 



