HISTEE. 413 



2? J5, Thorax with raised ridges. 



Body roundish ; fuiiicidus of antennae not thickened at 

 apical end, its joints grachially smaller ; cavities for recep- 

 tion of clul) of antennae deep, placed at anterior angles of 

 prosternum ; inandil:)les scarcely prominent ; legs slender, 

 tibiae somewhat cylindrical, with I'eeble spines ; elytra 

 with longitudinal ridges. Onthoj^hilus, Leach. 



C C. Thorax without separate side border or 

 ridges. 



a a. All tarsi five-jointed. 



Body roundish ; funiculus of antennae not thickened at 

 apical end, its first joint thick, second much longer and 

 thinner, rest small ; cavities for reception of club of 

 antennae tolerably large, placed in middle of sides of pro- 

 sternum ; mandibles retracted; legs slender, anterior tibiae 

 dilated in middle ; elytra without striae, or with only a 

 rudimentary oblique dorsal stria at base. Ahraeus, Leach. 



b l)» Front pairs of tarsi five-jointed, posterior 

 pair four-jointed. 



Body short oval; funiculus of antennae not thickened at 

 apical end, its first joint double as long as second, rest 

 small ; cavities for reception of club of antennae broad, 

 placed in middle of side of prosternum; mandibles retracted; 

 legs slender, anterior til)iae only slightly dilated toward 

 apex ; elytra with a fine marginal stria and sometimes 

 with one short oblique dorsal stria at base. A critics, Lee. 



H, Elytra completely covering abdomen. 



Antennae very short, ten-jointed ; first joint much 

 thickened, club received in a rounded excavation at 

 anterior angle of thorax ; eyes coarsely granulate ; thorax 

 transverse, with sides bordered, closely applied to elytra, 

 which are punctured in rows ; prosternum with a process 

 in front, covering under-side of head; first ventral segment 

 of abdomen much longer than second ; all coxae placed 

 apart, anterior pair globular, not prominent ; trochanters 

 ol)liquely truncate at apex ; tarsi slender, four-jointed, last 

 joint scarcely shorter than the rest together. 



Murmidius, Leach. 



Hister, 



A» Elytra with a lateral stria, 



