THE ANT-LOVING BEETLES. 



329 



//. Head large, truncate; antennae very remote; lirst dorsal 

 of abdomen with distinct basal carina?. 



XVII. EUPLECTUS. 



nil. Head smaller, the front more abruptly and strongly nar- 

 rowed ; antennae less distant ; abdomen without basal 

 carina?. . Thesiastes. 



gg. Thorax without a discal impression ; elytra without discal 

 striae. Bibloplectus. 

 ff. Prosternum finely but distinctly car mate throughout the mid- 

 dle of its length ; thorax with a small, subapical impression, 

 its basal foveaa connected by a transverse sulcu ; ; antenna 1 

 less widely separated, the tenth joint larger than usual. 



Thesium. 



ee. Antennal club consisting almost entirely of the Iarg2 abrupt ter- 

 minal joint; thorax without discal impressions. 

 Ninth and tenth antennal joints verj^ short, distinctly trans- 

 verse. 



j. Elytra with a subhumeral fovea from which an acutely ele- 

 vated carina extends to apex ; also with discal strise reach- 

 ing to middle; head never wider than thorax, the latter 

 with a large fovea on each side connected by a transverse 

 groove. Actium. 

 jj. Elytra without trace of a subhumeral fovea and without 

 discal strise, but with an elongate basal impression. 

 k. First dorsal segment of abdomen much elongated and with- 

 out trace of a median impression. 



XVIII. Teimiomelba. 

 JcJc. First dorsal shorter, equal to second. XIX. Melba. 



ii. Ninth and tenth antennal joints larger, less transverse; elytra 

 with a discal stria and with two basal foveae but without 

 subhumeral fovea ; sulcus of thorax not continued down the 

 flanks but ending in small enlargements near the margin. 



Tkimioplectts. 



Eafomis tolnlce Lee dark brown, polished, clothed with long, 

 dense pubescence, antennae and legs yellowish, length 2.1 mm., oc- 

 curs rarely near Cincinnati. 



XV. RHExiusLee. 1849. (Gr., "I break.") 



Head and thorax each wider than long; tarsi with two unequal 

 claws; antenna? elbowed. One of the three species occurs in the 

 State. 



023 (1957). Khexius ixsculptus Lee. Eiost. Journ. Nat. Hist.. VI, 1S49. 

 103. 



Subcylindrical, depressed. Pale reddish-brown, clothed with short erect 

 hairs. Head twice as wide as long, base truncate, front rounded, concave 

 and with three fovese; occiput carinate. Antennae reaching base of thorax, 

 joints 3 to S transverse, nearly equal ; ninth twice as wide as third ; tenth 



