THE ANT-LOVING BEETLES. 317 



eighth, ovate, truncate at base. Thorax finely punctulate, slightly wider 

 than long. Elytra one-half longer than thorax, discal lines parallel. Cari- 

 na? of first dorsal three-fourths the length of the segment, separated by one- 

 half its width. Length 1.4 mm. (Fig. 149. c.) 



Lake and Putnam counties; scarce. March 26-May 25. 



D. aJmorme Lee., and D. exsectiim Brend., both are recorded as 

 occurring in the "Northern States east of the Mississippi River," 

 while D. longulum is a southern form which may occur in the south- 

 ern counties. 



Bythinus tychoides Brend. (Fig. 149, />.), chocolate-brown, an- 

 tenna? and legs dark yellow, length 1.2 mm., has been taken at Cin- 

 cinnati, while Nisaxis tomeniosus Aube, reddish-brown, pubescence 

 long and fine, body coarsely punctate, length 1.2 mm., is recorded 

 from southern Illinois. 



XI. RYBAXIS Saulcy. 1876. 



In this genus the males have a strong tooth on the front tibia 1 . 

 Two species have been taken in the State, while another may occur. 



KEY TO SPECIES OF KYBAXIS. 



a. Median fovea of base of thorax large, pubescent ; antenna? of male very 

 long, the club slender. 603. VALIDA. 



. Median fovea small, not pubescent. 



6. Carina? on basal dorsal segment of abdomen including but one-fourth 

 of the width of segment between them; antennal club loose, the 

 next to last joints not elongate or compressed. CONJUNCTA. 



66. Carina? on base of abdomen including one-third of width of segment; 

 antennal club dilated and compressed in male, densely clothed with 

 black hairs. 604. BRENDELI. 



603 (1014). RYBAXIS VALIDA Brend., Bull. Lab. Nat. Hist. Iowa, I, 1890, 



273. 



Dark piceous-brown ; elytra and antenna? red; legs paler. Vertex with 

 a deep impression ; antennae nearly one-half the length of body, first joint 

 almost as long as third and fourth together; second shorter, oblong, 

 rounded; third to sixth narrower; seventh and eighth narrower and 

 shorter; ninth and tenth suddenly increasing in size, wider than long; 

 eleventh as long as the two preceding together. Thorax deeply impressed 

 each side near base. Length 2.2 mm. 



Posey County; rare. April 16. 



R. conjuncta Lee., black, elytra red or darker, length 1.8-2 mm., 

 is said to occur "over the territory east of the Mississippi River." 



604 (1916). RYBAXIS BRENDELI Horn. Crotch's Check List, 1S73, 36. 

 Black, shining; elytra ranging to piceous-red ; legs, palpi and club of 



antenna? reddish-brown. Head with two very large fovea? between the eyes. 



