January ,806] ■ PSYCHE. 327 



S'-. Vertex of lieail ;icute. the sides often concave in $ , distinctly 

 narrowed between e3'es, the central depression far removed 

 from apex (at least one-half the width of the apex in $ , some- 

 what less in 9 ) ; foveolae distinct bnt rather shallow, narrowly 

 triangular. Lateral carinae little incurvetl bnt the distance 

 between them much greater at hind than at front margin. 

 Prozona longer than metazona. Tegmina passing hind femora, 

 tapering toward apex ; ulnar area in ^ expamled distallv, much 

 wider than the discoidal and rather closely reticulated, the 

 anterior ulnar vein strongly approximated to radial ; in 9 the 

 anterior ulnar vein sub-parallel or somewhat nearer the radial, 

 the ulnar area wider than the discoidal, but the spurious longi- 

 tudinal vein less developed than in i)iaculipe)niis. Apex of 

 wings rarel)' with well-developed spurious veins. (Figs. lo, 

 loa). ...... Sp. lo, O. olivacea. 



5'. Antemiae long, tlepressed, of $ twice, of 9 one-and-a-half times 

 as long as head plus pronotum. Wings abortive, or very rarely 

 functional and in that case lacking opaque spot on costal margin. 

 $ with lateral lobes of pronotum shining black ami distal part of 

 scapular area of tegmina dilated (Fig. 11); 9 with ovipositor 

 short, little exserted, the upper valves enlarged and strongly toothed 

 at base (Fig. iia). (Gen. 8, Chloealtis.') Sp. 11, Ch. consfersa. 



4'. Foveolae visible from above as deep, linear impressions (Fig. 12). 

 (Gen. 9, Stenohothrits.) . . . Sp. 12, Si. airtipennis. 



3'. Tegmina with well-developed, elevated, intercalary vein (Figs. 13a, 15a). 

 (Gen. 10, A/ecostet/itts.) 

 9. Lateral carinae of pronotum distinctly divergent behind. Piozona 

 shorter than metazona. Anterior distal intercalary venules (espe- 

 cially in <J ) oljllque (Fig. 13a). .Sternum 9 of ^ not black medially. 

 10. Scapular area of tegmina with a conspicuous pale streak at base. 

 Intercalary vein of ^ with low, dull teeth (Fig. i^b). 



Sp. 13, M. //neat lis. 



io'. Tegmina without pale streak as above. Intercalary vein of ^ 



with high, acute teelh (Fig. 14). . .Sp. 14, M. gracilis. 



9'. Lateral carinae of pronotum sub-parallel. Prozona and metazona 



ot equal length. .Scapular area of tegmina without pale streak. 



Anterior tlistal intercalary venules nearly transverse. Stermmr 9 



of (? black on mltl-Iine. (Figs, i ^-i 15b.) .Sp. i~,, M. platvp/erns. 



