THE ANT-LOVING BEETLES. 



Group A. 



KEY TO SPECIES OF GROUP A. 



a. Vertex without a median carina ; occiput swollen behind, overlapping 

 the neck ; middle femora of male with a curved spine near the tro- 

 chanters. 612. ION^R. 

 ad. Vertex with one or more carina?. 



J). Vertex with three carina? converging in front. 



a. Front tibkc of male with a strong recurved spine near the middle; 

 middle femora notched above. (Fig. 151, b.) 

 d. Occiput swollen above ; hind tarsi of male with second joint di- 

 lated. ARMIGER. 

 (/(/. Occiput not swollen ; hind tarsi of male simple ; elytra punctu- 

 late; ninth antenhal joint one-half the width of tenth, eleventh 

 wider than tenth, ovate. 613. eerox. 



cc. Front tibia? of male simple; middle femora not notched above; hind 

 tibia? rather suddenly and strongly dilated on the inner side at 

 basal third. 614. cavicrus. 



1)1). Vertex with one median carina. 615. coneinis. 



*612 (1894). Batrisodes ion^e Lee, Bost. Journ. Nat. Hist, VI, 1849, 94. 



Uniform reddish-brown, shining, sparsely clothed with long yellowish 

 hairs. Head longer than broad, its surface sloping from the prominent 

 occiput to front margin. Antenna? half the length of body, joints 2 to 8 

 subequal, ninth larger, slightly transverse; tenth large, globular; eleventh 

 oblong-ovate, much thicker and toothed on inner side in male. Thorax 

 bell-shaped, widest at middle, slightly narrower at base ; disk with three 

 impressed lines, the median one entire and ending at base in a small fovea ; 

 sides with a small acute tubercle. Elytra sparsely and distinctly punctate ; 

 humeri rounded, not prominent. Abdomen slightly depressed at base, sparsely 

 and finely punctate. Length 2.5-2.7 mm. (Fig. 151, a.) 



Vigo and Crawford counties; rare. August 10-December 10. 

 One specimen on the latter date from beneath a partly buried chunk 

 in sandy woods. A species of southern range, described from 

 Georgia. 



B. armiger Lee, reddish-brown, sparsely pubescent, length 2.4 

 mm., is known Prom Pennsylvania. 



613 (1898a). Batresodes eerox Lee, Bost. Journ. Nat. Hist., VI, 1849, 95. 



Uniform reddish-brown, rather sparsely pubescent. Head quadrate ; 

 fovea? of vertex small and in a line behind the middle. Antenna? half the 

 length of body, joints 3-5 cylindrical, 6-9 quadrate or rounded and slightly 

 wider; tenth larger, globose in male, obconical in female; eleventh thicker, 

 oblique, truncate at apex, rounded at base, as long as the two preceding. 

 Thorax widest at apical third, sides strongly curved, apex half as wide as 

 base ; disk with three impressed lines, median one obsolete in front ; basal 

 fovea? deep. Elytra one-sixth wider at base than thorax, finely and evenly 

 punctate ; humeri with an obtuse spine. Carina? of basal dorsal very short, 

 separated by one-fifth the width of segment. Length 2.4 mm. (Fig. 151, 6.) 



