no 



FAMILY XI. — STAPHYLINIML 



KEY TO INDIANA GENERA OF BOLITOCHAKINI. 



a. Mesosternal process broadly truncate or einarginate behind; middle 

 coxae widely separated ; labial palpi with two joints only. 



IV. Gyrophjena. 



(id- Mesosternal process more or less pointed behind; middle coxae moder- 

 ately separated or contiguous. 



b. Labial palpi with two joints only. 



c Hind tarsi with the first joint at least as long as the second and 

 third together; front tarsi with the first joint distinctly longer 

 than the second ; ligula very broad and short, very broadly 

 rounded in front ; labial palpi short, their first joint swollen. 



Placusa. 



cc. Hind tarsi with the first joint not or only a little longer than the 

 second ; front tarsi with the first three joints equally long ; ligula 

 very narrow ; labial palpi with both joints more or less elongate. 

 d, Labial palpi moderately long, not bristle-like ; ligula moderately 

 narrow^, split at tip ; body depressed. V. Homalota. 



dd. Labial palpi very narrow, prominent, stiff, bristle-like; ligula 

 very narrow, entire, more or less narrowed toward tip; body 

 rather convex. Silusa. 

 Labial palpi with three joints. 

 e, Ligula entire. 



/. Labial palpi with the second joint as long as and scarcely nar- 

 rower than the first. VI. Leptusa. 

 ff. Labial palpi with the second joint longer and narrower than the 

 first; thorax wider than elytra. VII. Philotermes. 

 ee. Ligula split, or bifid at tip. VIII. Bolitochara. 



IV. Gyroph^na Mannh. 1830. (Or., ' ' a circle + to show. ") 



Form short and broad; antenna? rather short; head strongly 

 transverse; eyes prominent; third joint of maxillary palpi thick- 

 ened; thorax short, broad, distinctly margined; elytra large, abdo- 

 men short and broad; surface smooth, shining, almost destitute of 

 hairs or punctures. , The species live in fungi and are gregarious. 



KEY TO INDIANA SPECIES OF GYROPH^ENA. 



a. Antennae abruptly dilated beyond the fourth joint, the last seven joints 

 forming a loose parallel club. 

 1>. Elytra and abdomen almost wholly black or piceous. 



(535. COKKUSCULA. 



bb. Elytra and abdomen almost wholly pale. 636. lobata. 



aa. Antennal joints gradually enlarged from fourth joint to tip ; abdomen 

 bicolored. - 



c. Eyes always separated by more than twice their own width ; base 



and apex of abdomen pale. 637. vinula. 



cc. Eyes more convex, separated by not more than their own width ; 

 basal half of abdomen pale, apex black. 63S. dissimilis. 



