llYrOGYl'TUS. 231 



II. Elytra smooth, generally with three rows of 



punctures. 



Thorax smooth, with a row of four punctures along the 



anterior margin, anotlier along posterior margin, and three 



punctures along each side margin. Disc either impunc- 



tate or with two or more punctures. 



1, Last joint of labial palpi as Ijroad as, or broader 

 than second. 



A A. Maxillary palpi short ; anterior tarsi 



dilated in male. 



Ligula slightly excised in middle, paragiossae shorter than 



ligul'a. Head roundish. Megacronus, Steph. 



B B. Maxillary palpi elongate ; anterior tarsi 



not dilated in male. 



Ligula as in Megacronus. Bolitolius, Leach. 



2, Last joint of labial palpi much narrower than 

 second. 



A A. Fourth joint of maxillary palpi about as 



long as third and slightly narrower. 



Ligula slightly excised in middle; paragiossae shorter 



than' ligula. Br y oji o r u s, Kr. 



B B. Fourth joint of maxillary palpi only half 



as long as, and much narrower than third. 



Ligula as in Brgoporus. Mycetopo r us, Mann. 



Ilypocyijtiis. 



A. Club of antennae not abrupt ; seventh joint nearly as 

 long as eighth. 



Black, shiny; antennae and legs yellow-brown; side 

 margins of thorax with a pale yellowish appearance ; apex 

 of abdomen generally pitch-brown. Posterior angles of 

 thorax nearly right angles; elytra half as long again as 

 thorax. L. |— | 1. Common. H. longicornis, Payk. 



B. Club of antennae aljrupt, eighth joint distinctly longer 

 than seventh. 



a. Elytra unicolorous black or pitch-brown. 



I, Elytra one-third longer than thorax ; apex of ab- 

 domen red-brown. 



