ROLAND HAYWARD. 39 



5. Elytra with two dorsal puuctures. 



Thorax trapezoidal, scarcely convex, the basal fovese distinctly bistriate, 

 the outer stria as long or longer than the inner ; legs dark. 



Group vii. planatum. 



Thorax trapezoidal, scarcely convex, the basal fovese unistriate or feebly 



bistriate with the outer stria very small ; legs rufous or testaceous, the 



femora rarely darker Group viii. transversals. 



Thorax subcordate or cordate, convex, basal foveee bistriate. 



Group ix. ustulatum. 

 Elytra with three dorsal punctures Group x. rickseckeri. 



6. Humeral line not hamate 7. 



Humeral line hamate uniting with the fifth stria, which is entire; frontal 



strise normal Group xix. iridescens. 



7. Elytra with two dorsal punctures 8. 



Elytra with three dorsal punctures, all the striae entire ; frontal strije normal. 



Group xi. scudderi, 

 Elytral intervals with irregular rows of small, sparsely placed setigerous 

 punctures, all the striaj abbreviated behind ; frontal strise normal. 



Group xviii. semistriatum. 



8. Frontal stripe normal 9. 



Frontal strife double, often convergent 10. 



9. Elytra distinctly striate with at least the first and second striae entire; head 



often alutaceous Group xii. varieg-atum . 



Elytra obsoletely striate, all the striae abbreviated behind. 



Group xiii. bifasciatum. 



10. Frontal striae double, nearly straight, the outer stria entire. 



Group xvi. sulcatum. 

 Frontal striae double, oblique, the outer stria interrupted. 

 Thorax cordate, pedunculate or subpedunculate. 



Group xiv. quadrimaculatum. 



Thorax cordate or sub(^ordate, truncate at base Group xv. aflflne. 



P'rontal striae very oblique, strongly convergent, double, the outer shorter 

 than the inner and less deep, often feeble ; thorax cordate, truncate at 

 base Group xvii. assimile. 



11. Maxillae with the outer lobe bi-articulate; elytra with two dorsal punctures 



on the third stria Group xx. laticeps. 



Maxillae with the outer lobe with the two joints united ; mandibles long, 

 slender, nearly straight; elytra with two dorsal punctures on the third 

 interval Group xxi. oblong-ulum. 



Group i. Isevigabum. 



Maxillte with the outer lobe bi-articulate ; mentum with a short 

 bifid tooth ; frontal striiie siugie, straight, parallel ; eyes luoderately 

 large, prominent. Prothorax truncate at base, scarcely obliquely .so 

 each side. Elytra with the humeri subangulate ; stride abbreviated 

 behind, rather feebly impres.sed with large, deep punctures; eighth 

 stria distinct from the margin ; intervals with irregular rows of 

 setigerous punctures. 



This group includes but one species. 



TRANS. AM. ENT. SOC. XXIV. FEBRUARY, 1897. 



