122 COLEOPTERA OF NORTH AMERICA. 



Tribe III.— E]\'DOM[YCHI]¥I. 



One species, Endomychus higuUalus Say, found in the Atlantic- 

 region, represents this tribe in our fauna. It is a very pretty 

 shining black, glabrous insect, witli scarlet elytra, each orna- 

 mented with two black spots. There is no special difference, 

 between this and the preceding tribe, except in the form of the 

 ligula, which is here oblong and rounded at tip. The genus 

 differs- from the foreign genera by the following characters: — 



Prosternum flat, spatulate, not margined ; antennte elongate, 

 with loose not large club ; sides of prothorax feebly sinuate, 

 strongly but narrowly margined; longitudinal basal impressions 

 very deep, but the transverse line is represented only by a very 

 fine basal margin. 



Fam. XXII.— erotylidae. 



Mentiira of variable form, well developed, usually divided 

 into three more or less distinct surfaces, anterior margin bi- 

 sinuate: ligula variable, palpi 3-jointed, first joint slender, 

 second short, third variable in form. 



Maxillae exposed at the base, with two lobes, the outer 

 oue subtriangular, as long as the inner one, which slender, 

 ciliate, sometimes with one or two spines: palpi 4-jointed, 

 first joint slender, second and third short and obconical, 

 fourth variable. Submentum transverse. 



Eyes finely or coarsely granulated, oval or rounded. 



Antennas 11-jointed, inserted at the sides of the front, on 

 the inner anterior margin of the eyes, the last three or four 

 joints forming a distinct club. 



Head small, or moderate, immersed in the prothorax to 

 the hind margin of the eyes, with the front forming a more 

 or less distinct muzzle. 



Labrum transverse, rounded or emarginate, ciliate. Man- 

 dibles stout, curved, toothed or cleft at tip, inner margin 

 often bordered with membrane. 



Prothorax with- side margin distinct; side pieces separate 

 from the prosternum, which is not abbreviated; coxal cavi- 

 ties usually closed, but open in Langurini, never confluent, 

 always separated by the prosternum. 



Mesosternum moderate in size, side pieces somewhat vari- 

 able in form. 



Metasternum long, in proportion to the form of the body, 

 side pieces narrow, linear, epimera usually visible. 



