MCNEILL REVISION OF THE TRUXALIN^ OF NORTH AMERICA. 197 



J.^ Lateral carinje of the pronotum present, median carina not accom- 

 panied by supplementary carince upon the disk. (Fig. 1 2a) .... 

 12. — Akcntetus, n. gen. 



1.2 Color plain; scapular area of the elytra not broader than the me- 

 diastine area. (Fig. 13.) 13. — Amblytropidia, Stal. 



H.2 Median carina of the pronotum cut much behind the middle by 

 the principal sulcus 14. — Chloedltis, Harr. 



E.2 Scutellum of the vertex with no distinct median carina. (Fig. 15a.) 



F.' Median carina of the pronotum cut much behind the middle by 

 the principal sulcus. 



G.' Posterior margin of the metazone angulate. Tegmina usually 

 much shorter than the abdomen, with the ulnar area not very 



much wider than the digcoidal area. (Fig. 22, u.a. , d.a.) 



i^.—Dic/iroiiiorpha, Morse. 



G.2 Posterior margin of the metazone rounded or not distinctly angu- 

 late. Tegmina not much shorter than the abdomen, with the 

 ulnar area very wide and several times as broad as the discoidal 

 area 16. — Clinoccplialus, Morse. 



F.2 Median carina cut near the middle by the principal sulcus. 



G.' Hind tibiae never red 17. — Orphiila, Stal. 



G.2 Hind tibiae red. 



H.' Antennas depressed basally, long and acuminate; face strongly 

 -oblique \%. — Alpha, Brunner. 



H.2 Antennae filiform, face moderately oblique in the male, subperpen- 

 dicular in the female 19. — Phlibostroma, Scud. 



D.2 Tenipora plain or foveolate, visible from above (in Mecostethiis 

 small or minute, triangular, and basal (Fig. 22a). In this case the 

 intercalary vein is very strong (Fig. 22). In Bootcttix, female, not 

 very easily visible from above as they are almost vertical plain 

 triangular spaces (Figs. 23a and 23b). In this case the antennce 

 are shorter than the head and pronotum and the lateral carince of 

 the pionotum are wanting). 



E.' The vertex is not bounded in front by a raised line and, viewed 

 from the side, it does not form an angle with the face. (Figs 20 

 and 21 ; compare 22 and 23.) The tempora are very faintly im- 

 pressed spaces which are very strongly declivent. Intercalary 

 vein of the tegmina wanting. (Figs. 20, 21.) 



F.' Tegmina plain ; lateral cariuce of the pronotum very little sinuate. 

 20. — Bodpedon, Thos. 



[Pboo, p. A. N. S., VoL VJ.] 25 [December 2, 1896]. 



