482 FAMILY XT. STAPTIYTJNIDyE. 



lary palpi truncate at apex, fourth very short, slender; antennas 

 short; thorax subcylindrical ; hind tarsi with joints one and two 

 slightly longer than three and four, which are equal. 



930 (2876). EPHELIS NOTATA Lee., N. Sp. N. Amer. Col., I, 1S63, 58. 

 Elongate-oval, Black, feebly shining; legs and base of antennae red- 

 dish-yellow; elytra each with the apical margin and a small rounded spot 

 at middle reddish-yellow. Thorax subquadrate, widest at apical fourth, 

 the sides thence almost straight and slightly converging to base ; disk 

 densely and rather coarsely and roughly punctate. Elytra at base one- 

 third wider than thorax, feebly widening to tips, which are truncate ; sur- 

 face coarsely and densely punctate. Length 2.5-2.7 mm. 



Lake County; rare. May 25. 



Tribe IV. PROTEININI. 



Species not exceeding 3 mm. in length, having the antenna? 

 inserted under the sides of the front ; head without ocelli ; proster- 

 num horn-like behind the front coxa?, which are transverse and 

 somewhat prominent; hind coxae transverse; tarsi 5-jointed. Two 

 genera represent the tribe in the United States. The species of this 

 tribe are treated by 



Fauval. "Les Staphylinides de L'Amerique du Nord," in Bull. 

 Soc. Linne., II, 1878, 190-196. 



KEY TO GENEKA OF PROTEININI. 



a. Antennae with only the last joint larger ; thorax always with a median 



impressed line. LXXXVI. MEGARTHRUS. 



aa. Antenna? with the last three joints larger. PROTINUS. 



LXXXVI. MEGARTHRUS Steph. 1831. (Gr., "big + joint.") 



Small, broad subdepressed species, having the head much nar- 

 rower than thorax, constricted at base ; maxillary palpi short, the 

 fourth joint slender and acuminate; antenna? short, the last joint 

 very large, subglobose; elytra truncate, covering more than one- 

 half of abdomen ; hind tarsi with first four joints short, equal. One 

 species has been taken and another perhaps occurs. 



KEY TO INDIANA SPECIES OF MEGARTHRUS. 



a. Thorax black, the sides slightly augulate. EXCISUS. 



aa. Thorax dull yellow, the disk brownish. 931. AMERICANUS. 



M. excisus Lee., piceous, narrower than americanus, 2.5 mm. in 

 length, is recorded by Dury from Cincinnati. 



931 (2883). MEGARTHRUS AMERICANUS Sachse., Stett. Ent. Zeit, 1852, 149. 

 Oblong-oval, depressed. Dusky or fuscous yellow ; head black ; legs 



dull yellow. Head narrower than thorax, finely rugose. Thorax as wide 



