318 PROCEEDINGS OF THE ACADEMY OF 



EVARTHRUS Lee. 



Obs. Posterior tarsi not grooved on outer side ; protliorax va- 

 riable ; elytra with rounded humeri, and one dorsal puncture, scu- 

 tellar stria usuall}' short or i)unctiforra, rarely long ; metathoracic 

 episterna sliort ; first ventral segment margined at the base ; pro- 

 sternum not margined behind. 



A. Prosternnm deeply sulcate, emarginate at tip ; prothorax quadrate, 



feebly narrowed and not constricted at base ; basal fovepe large and 

 deep, bistriate with a supplementary inner fovea, hind angles cari- 

 nate ; base finely margined each side. 



a. Hind angles obtuse, sides not sinuate near the base ; marginal stria; 



approximate : 



* Prothorax wider than long, scutellar stria Avanting : 

 Prothorax more widely margined, especially towards the base : 



Elytral strire strongly punctured ; 'J, 9 dull. 1. se.vimpressus Lee. 



Pi-othorax more narrowly margined: 

 Elj^tral striae strongly punctured, 9 dull, % subopaque ; vidua Dej. 



2. si(/ilUitus Say. 

 Broader, elj'tral strise finely punctured, hind angles of prothorax less 

 obtuse, 9 % subopaque. 3. americanus Dej. 



** Prothorax as long as wide : 

 Scutellar stria long, hind angles obtuse, somewhat rounded, less strongly 

 cariuate ; elytral striaj finely punctured, % dull ; conviva Lee. 



4. orbatus Newm. 



b. Sides of protliorax slightly sinuated near the base, hind angles rec- 



tangular ; scutellar stria wanting : 



* Hind angles very small : 



Prothorax more widelj^ margined towards the base, elytra 9 subopaque, 



marginal strire approximate. 5. Engelmanni Lee. 



Prothorax less widelj^ margined ; elytra 9 very dull, marginal strise less 

 approximate. 6. nonnitens n. sp. 



** Hind angles more prominent, more strongly earinate : 

 Elytra % 9 shining ; marginal stria^ not approximate. 7. gravidas Hald. 



B. Prothorax strongly constricted behind, sides suddenly strongly sinu- 



ate, hind angles rectangular prominent, carinated, basal foveas deep, 

 bistriate, base margined each side ; prosternnm feebly or only obso- 

 h'tclj' sulcate. 

 a. Elytra feebly sinuate at tip, 9 subopaque ; 

 Very large shining, striae nearly ethiced punctured, scutellar long ; hind 



angles of prothorax very prominent. 8. Jiei'os Say. 



Strife distinct, jiunctured, scutellar short : 



Hind angles of prothorax very prominent. 9. colossus Lee. 



Hind angles shorter and less prominent : 



Sides of jnothorax very much rounded ; fatutis Lee, corax Lee., 

 orbutusX Lee. 10. sodalis Lee. 



