COLYDIIDAE. 127 



Anterior coxal cavities open behind. 

 AntennjE 10-jointed, club solid. 



Head without ant(mnal grooves. Synchita. 



Head with distinct grooves. Cicones. 



Antennae 11-jointed, club 2-jointed. 

 Eyes free, rounded. 



Head without antennal grooves. Ditoma. 



Head with distinct antennal grooves. 



Tibise with distinct terminal spurs. Eudesma. 



Tibiae without terminal spurs. Endophlceus. 



Eyes emarginate by the sides of the front. 



Antennal grooves distinct. Phlceoiiemus. 



Anterior coxal cavities closed behind. 



Antennas with a 2-jointed club ; no tibial spurs. Coxelus. 



Antennaj with a 3-jointed club; small til)ial spurs. Lasconotus. 



Eiidophloeus and Phloeoneraus occur on tlie Pacific coast, 

 Cicones and Eudesma on the Atlantic side, the other genera 

 have representation on both sides of the continent. 



Tribe III.— COLYDIIXI. 



Species having a cylindrical, sometimes very slender form; 

 found under bark. Aglcnus has been introduced from Europe. 

 Eulachus, formerly placed in this tribe, has been united with 

 Ditoma of the Synchilini. 



The genera indicate three groups: — 



Anteriorcoxa; narrowly inclosed behind, prosternum at tip attaining the 



posterior margin. Group Colydii. 



Metasternal side pieces moderate. Anterior tibiae finely denticulate at 



outer apical angle. Aulonium. 



Metasternal side pieces linear. Anterior tibiae with outer aiiical angle 



prolonged. Colydium. 



Anteriorcoxa^ Ijroadly inclosed behind, the epiniera meeting on the median 



line, presternum not attaining the margin. Group Nematidii. 



Metasternal side pieces covered. Nematidium. 



Anterior coxal cavities open behind. Head witlmut eyes. Group Acji.kxi. 



Metasternal sides pieces narrow. Aglenus. 



Nematidium occurs in the Gulf States, Auionitim and Colydium 

 are represented on both sides of the continent. The introduced 

 Aglenus occurs in the Atlantic region and California. 



