650 FAMILY XXVI. NITIDULID/E. 



1253 (3758). IPS CONFLUENTUS Say, Jouru. Phil. Acad. Nat. Sci., Ill, 1823, 



195 ; ibid. II, 125. 



Elongate-oblong. Head and thorax piceous black; elytra largely dull 

 yellow ; the tips, an oblique humeral spot, a small spot on each side of 

 scutellum, the suture at base, and a large discal spot connected with the 

 margin, piceous. Surface coarsely punctured. Sexual characters as in 

 quadriguttatus. Length 4.5-5 mm. 



Marion, Vigo, Crawford and Posey counties; scarce. June 27- 

 December 8. 



Tribe VII. RHIZOPHAGINI. 



This tribe is represented by a single genus of small, slender, 

 elongate species which live beneath bark. They have the antenna 

 10-jointed with two-jointed club; prosternum not prolonged at tip; 

 abdomen with the first and fifth segments long, the intermediate 

 three, short, equal; elytra truncate, exposing the last segment of 

 abdomen, and tarsi 4- and 5- jointed in the males, 5- jointed in the 

 females. 



XXII. RHIZOPHAGUS Herbst. 1793. (Gr., "root + eat.") 



Nine species of this genus are listed from the United States, 

 only two of which have been taken in the State, though three others 

 may occur. 



KEY TO INDIANA SPECIES OF RHIZOPHAGUS. 



a. Thorax longer than wide. 



?;. Elytral rows of punctures distinctly impressed and reaching the tips; 

 length 3-3.5 mm. 1254. SCALPTURATUS. 



&6. Elytral rows of punctures not impressed. 



c. Thorax beneath nearly smooth ; in male very decidedly narrowed 

 from apex to base, its sides nearly straight; length 4.5 mm. 



CYLINDRICUS. 



cc. Thorax beneath distinctly punctured, scarcely or not narrowed be- 

 hind in male, sides feebly curved in both sexes; piceous, elytra 

 each with two red spots. 1255. BIPUNCTATUS. 



a a. Thorax as wide or wider than long; length 2.5 mm. 



(L Elytra pitchy black. REMOTUS. 



<t<L Elytra each with two oblique reddish spots. MINUTUS. 



1254 (37G5). RHIZOPHAGVS SCALPTURATV s Mann., Bull. Mosc., II, 1852, 362. 

 Elongate, slender, subcylindrical. Dark reddish-brown or piceous. Tho- 

 rax longer than wide, sides feebly curved, gradually narrowed to base; disk 

 at middle subdepressed, sparsely and coarsely punctured, sides more finely 

 punctured. Elytra not wider than apex of thorax, the stria? rather coarsely 

 punctate; intervals flat. Length 3-4 mm. 



