128 COLEOPTERA OF NORTH AMERICA. 



Tribe IV.— DERETAPIIRIIVI. 



This tribe contains three genera of elongate cylindrical form. 



Tarsi rather short, the first tliree joints not as long as the fourth. An- 

 tenna ten-jointed, club solid. Anterior coxse contiguous, tlicir cavities 

 very narrowly closed behind. Oxylaemus. 



Tarsi moderately long, first three joints longer than the fourth. Antennae 

 eleven-jointed, club three-jointed, anterior coxae distinctly separated, 

 their fcavities distinctly closed behind. Deretaphrus. 



Tarsi long, first joint always longer than the nest two together, and tliat 

 of the middle tarsus much longer. Autennse eleven-jointed, club two 

 jointed. Anterior coxse contiguous, their cavities distinctly closed be- 

 hind. Sosylus. 



Deretaphrus occurs in Oregon and Australia, the other two 

 genera have one species on each side of the continent. 



Tribe v.— PYCIVOMERIIVI. 



Elongate, somewhat flattened species, covered with coarse punc- 

 tures, having on the elytra rows of very large punctures. Tht; 

 palpi are cylindrical, and the posterior coxae, as in the preceding 

 tribe, are distant, but the ventral segments are equal in length. 



Antennae with eleven distinct joints, clul) '2-jointed. Penthelispa. 



Antennae with ten apparent joints, club solid. Pycnomerus. 



Penthelispa Pascoe was subsequently described in the first 

 edition of this work as Endectun. Two species of the first, and 

 one of the second genus occur in the Atlantic region. 



Tribe VI.— BOTHRIDERIIVI. 



In this tribe the posterior coxte are widely separated, and the 

 first ventral segment is elongated. The species are somevv^liat 

 flattened, and the elytra are ribbed ; the buccal cavity is deep, 

 and the oral organs are retracted ; the mentum is transverse and 

 concave, and the inferior margin of the mandibles is dilated at 

 the base ; the eyes arc not prominent ; the antenna are short, 

 1 1 -jointed, with the club 2-jointed. 



Head horizontal or nearly so. Antc^rior ooxie very narrowly inclosed be- 

 liind. Outer apical angle of tibia? not prolonged. Bothrideres. 



Head deflexed. Anterior coxae very distinctly inclosed. Outer apical 

 angle of tibife prolonged; Erotylathria. 



