456 CLAVICORNIA — CUCUJlDAE. 



Ligula rounded in front. Anterior tibiae with one of 

 the apical spines curved ; first tarsal joint shorter than 

 second. Laemophloeus, Dej. 



II. Inner lobe of maxillae without hook ; last joint 

 of maxillary palpi almost double as long as third, 

 gradually narrowed, but truncate at apex. 



Central joints of antennae alternately larger and smaller. 

 Ligula bilobed. First tarsal joint shorter than second. 



Pediacus, Shuck. 



b. All tarsi with five joints in both sexes. 



I, Fourth tarsal joint of usual size. 



First joint of antennae elongate. Last joint of maxillary 

 palpi large, triangular ; ligula slightly eraarginate. Third 

 tarsal joint produced. Psammoechus, Boudier. 



II, Fourth tarsal joint very small. 



1, Club of antennae three-jointed. 



A A, Last joint of maxillary palpi gradually 

 narrowed, truncate at apex ; thorax narrower 

 at base than at apex. 



Head almost square behind, narrowed, produced and 

 truncate in front ; club of antennae elongate and rather 

 loose ; thorax elongate, gradually narrowed behind, often 

 toothed at sides, anterior angles prominent ; third tarsal 

 joint emarginate, fifth joint as long as first three togetlier, 

 first three joints hairy beneath. Silvanus, Latr. 



H H, Last joint of maxillary palpi cylindrical, 

 thorax as broad at base as at apex. 



Head triangular, obtuse in front ; club of antennae with 

 its first joint small, second larger than first and third, 

 transverse, tliird nearly globular ; thorax transverse ; fifth 

 tarsal joint longer than the rest together, first three joints 

 hairy beneath. Pij^locoelus, Gu^r. 



2, Club of antennae two-jointed. 



In other respects similar to Diplocoelus. 



Di'pliyllus, Shuck. 



3, Club of antennae four-jointed. 



Temples not prominent; eighth joint of antennae broader 

 tliau preceding joints ; anterior angles of thorax reaching 



