o42 CLAVICOENIA. 



a 2. All abdominal segments about 

 equally large. 



Antennae sometimes scarcely thickened toward apex, 

 sometimes with three larger apical joints ; legs placed more 

 or less apart ; tarsi five-jointed, posterior pair in male 

 sometimes four-jointed. Cucujidae. 



b 2. First abdominal segment 

 larger than the rest. 



Club of antennae loose, usually three, rarely two-jointed ; 

 legs placed apart ; tarsi five-jointed, posterior pair in male 

 often with only four joints. Gryptophagidae. 



C 2. First two abdominal segments 

 fixed together. 



Club of antennae three-jointed, somewhat flattened ; last 

 joint of maxillary palpi generally hatchet-shaped ; legs 

 placed apart ; tarsi generally apparently four-jointed. 



Erotylidae. 



b 1. Tarsi apparently or really with 

 three joints. 



A 2, First and second tarsal joints 

 broad, produced beneath base of 

 succeeding j oint and thickly covered 

 with hairs on under-side. 



a 2, Tarsi with three joints ; 

 socket-holes of anterior coxae 

 generally closed. 



Antennae short, inserted before eyes, with a three-jointed, 

 flattened club ; last joint of maxillary palpi hatchet-shaped ; 

 posterior coxae apart, ridgelike border of intercoxal process 

 generally continued on to first abdominal segment as a fine 

 raised line, curved toward apex or side margin, or in a semi- 

 circle round coxae ; body convex, hemispherical or short 

 oval. Coccinellidae. 



b 2» Tarsi with four joints, third 

 very small ; socket-holes of an- 

 terior coxae open. 



Antennae moderately long, inserted between or before 

 eyes, last three joints more or less thickened ; last joint of 

 maxillary palpi sometimes nearly hatchet-shaped ; posterior 



