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. ahnorme Lee, and D. exsectum 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, b.), chocolate-brown, an- 

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

 cinnati, while Nisaxis foment osus Axibe, 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?. 

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



KEY TO SPECIES OF EYBAXIS. 



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

 long, the club slender. 603. valida. 



aa. Median fovea small, not pubescent. 



J). 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. 

 l)l>. 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 (1914). 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 ; antenna? 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 Connty; rare. April 16. 



E. 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 beendeli 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. 



