21 



EVARTHRUS, Lee. 



Posterior tarsi not grooved on outer side ; prothorax variable ; 

 elytra with rounded humeri, and one dorsal puncture ; scutellar stria 

 usually short or punctiform, rarely long ; metathoracic episterna 

 short ; first ventral segment margined at the base ; prosternum not 

 margined behind. 



A. Prosternum deeply sulcate, emarginate at tip; prothorax quadrate, feebly 

 narrowed and not constricted at base; basal foveas large and deep, bistriate 

 with a supplementary inner fovea, hind angles carinate; base finely mar- 

 gined each side. 



a Hind angles obtuse, sides not sinuate near the base ; marginal stria? approx- 

 imate : 



* Prothorax wider than long, scutellar stria wanting. 

 Prothorax more widely margined, especially toward the base. 



Elytral striae strongly punctured; r -Q U dull. 1. seximpressus, Lee. 



Prothorax more narrowly margined. 

 Elytra] striae strongly punctured, 9 dull, V X3 sub-opaque ; vidua, Dej. 



2. sigillatus, Say. 

 Broader, elytral stria? finely punctured, hind angles of prothorax less obtuse, Q 

 ^X) sub-opaque. 



** Prothorax as long as wide : 

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

 nate: elytral stria 1 finely punctured, " n dull; eonviva, Lee. 



4. orbatus, Newra. 

 b. Sides of prothorax slightly sinuated near the base, hind angles rectangular; 

 scutellar stria wanting: 



* Hind angles very small: 



Prothorax more widely margined toward the base ; elytra 9 sub-opaque ; margi- 

 nal stria' approximate. 5. Engelmanni, Lee. 



Prothorax less widely margined ; elytra O very dull ; marginal stria? less ap- 

 proximate. 6. nonn 1 'tens, n. sp. 

 , ** Hind angles more prominent, more strongly carinate : 



Elytra n 9 shining; marginal stria 1 not approximate. 7. gravidus, Hald. 



B. Prothorax strongly constricted behind, sides suddenly strongly sinuate, hind 



angles rectangular prominent, carinated, basal fovea? deep, bistriate, base 

 margined each side; prosternum feebly or only obsoletely sulcate. 

 a. Elytra feebly sinuate at tip, 9 sub-opaque: 

 Very large shining, stria' nearly effaced punctured, scutellar long; hind angles 

 of prothorax very prominent. 8. heron. Say. 



Stria' distinct, punctured, scutellar short : 



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



Hind angles shorter and less prominent: 

 Sides of prothorax very much rounded: fahius Lee, rora.r Lee., orbatus, 

 Lee. 10. soda/is. Lee. 



