394 FAMILY XI. — STAPHYLINIDiE. 



702 (2252). AcTOBius jocosus Horn, Trans. Amer. Ent. Soc, XI, 1884, 

 232. 

 Elongate, slender, parallel. Color of preceding except that ttie elytra 

 are wholly black, and the antennae brown, paler at base. Thorax oblong, 

 slightly narrowed behind, sides almost straight, punctate as in pwderoides; 

 elytra much longer and more coarsely punctured than there, one-half longer 

 than wide. Length 4.5 mm. 



Lake County ; rare. June 15. Taken from beneath the prickly- 

 pear cactus. 



A. inutilis Horn, 3.5—4 mm. ; A. patella Horn, 5 mm. ; A. termi- 

 nalis Lee, 4.5 mm., and A. umhrvpennis Lee, 3.5 mm. in length; 

 aU have a known range which might include Indiana in their dis- 

 tribution, but no one of them has as yet been noted within the State, 



Tribe III. XANTHOLININI. 



Vei-y slender, small or medium-sized sjn'cies. biiviiii;- the head 

 usually equal in width to thorax and narrowed behind into a small 

 neck; antennse elbowed, inserted close together near the middle of 

 the front margin of the front; thorax long and rectangular with 

 rows of punctures of which the outer ones are curved, its side mar- 

 gins double and thdracic spiracles visible. Of the seven genera 

 comprising the tribe, four are represented in Indiana. 



KEY TO INDIANA GENEEA OF XANTHOLININI. 



(/. Antennae strongly elbowed; edges nf elytra overlapping at suture; mid- 

 dle coxae widely separated. 

 6. Last .loint of maxillary imlpi long, not awl-shaped. 



XXXVII. Xantholini'n, 

 66. Last joint of maxillary palpi short, awl-i^haped. 



0. Front tarsi broadly dilated ; head densely strlgose-punctate. 



XXXVIII. Leptolinus. 



cc. Front tarsi not dilated. XXXIX. Leptacinus. 



iia. Antennae feebly elbowed; elytra not overlappiiii; at suture, the sutural 



stria deep ; thorax narrowed in front. XL. Diociius. 



XXXVII. Xantholinus Serv. ^H■1'^. ((Jr.. "yelbjw.") 



This genus, sufficiently characterized above, is i-('])i-espnted in the 

 State by nine known species, while one other ma\' occur. 



KEY TO INDIANA SPECIES OF XANTHOIJNUS. 



II. ripper (oulcr) mnrginal line of Ihorax hciil downward and united with 



the lower one a( middle; Ihcira.x with dorsal rows ol' five or six fine 



punctures. 7,13. cephat.i s. 



an. Tiiper marginal line of thorax scparalc fnim the lower (me nearly ti> 



apex, not bent downward in irmit. 



