394 FAMILY XI. STAPHYLINIDJE. 



702 (2252). ACTOBIUS jocostis Horn, Trans. Amer. Ent. Soc., XI, 1884. 



232. 



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

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

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

 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- 

 inilis Lee.. 4.5 mm., and A. unibripennis Lee., 3.5 mm. in length; 

 all 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. 



Very slender, small or medium-sized species, having the head 

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

 neck; antennas 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 thoracic spiracles visible. Of the seven genera 

 comprising the tribe, four are represented in Indiana. 



KEY TO INDIANA GENERA OF XANTHOLININI. 



. Antennae strongly elbowed; edges of elytra overlapping at suture; mid- 

 dle coxae widely separated. 

 b. Last joint of maxillary palpi long, not awl-shaped. 



XXXVII. XANTHOLIJN i s. 

 1>1). Last joint of maxillary palpi short, awl-shaped. 



c. Front tarsi broadly dilated ; head densely strigose-punctate. 



XXXVIII. LEPTOLINIS. 



cc. Front tarsi not dilated. XXXIX. LEPTACINUS. 



mi. Antennae feebly elbowed; elytra not overlapping at suture, the sutural 



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



XXXVII. XANTHOLINUS Serv. 1825. (Gr.. "yellow.") 



This genus, sufficiently characterized above, is represented in the 

 Shite by nine known species, while one other may occur. 



KEY TO INDIANA SPECIES OF XANTHOLINUS. 



*/. 1'pper (outer) marginal line of thorax bent downward and united with 



the lower one at middle; thorax with dorsal rows of five or six fine 



punctures. 7(!3. CEPHAS'S. 



<ui. I'pper marginal line of thorax separate from the lower one nearly to 



apex, not bent downward in front. 



