CEDEMERID^ OF BOREAL AMERICA. 385 



Tarsi with the penultimate alone spongy-pubescent. 5. 



5. — Both mandibles bifid at tip. 6. 



Right mandible bifid, left entire. Alloxacis. 



Both mandibles simple. 9- 



6.— Head slightly prolonged, the antenna? at base separated from 



the eyes. 8. 



Head short, antennas very near the eyes. 7. 



7.— Claws simple. CopidUa. 



Claws toothed. Asclera. 



8. — Eyes entire; antennas slender. Chri/sanlhht. 



Eyes slightly emarginate, antenna? slightly flattened. Sisenes. 



9.— Head short. Oxacis. 



Head prolonged in a beak. Rhinoplalia. 



Calopus Fab. 



Form slender. Eyes deeply emarginate, embracing 

 the base of the antenna?. Mandibles bifid at apex. 

 Antennas subserrate, inserted upon slight protuberances, 

 eleven-jointed. Tibia? with two terminal spurs, tarsi 

 with two joints spongy-pubescent beneath, the penulti- 

 mate alone bilobed, the antepenultimate triangular and 

 but feebly emarginate. Claws simple. 



This genus is represented by one species in our fauna, 

 which resembles in its habitus some of our more slender 

 Elaphidion. 



Calopus angustus Lee. Ann. Lye. N. Y., v, p. 158. 



Form slender, brownish, finely, sparsely pubescent. 

 Head moderately coarsely punctate, more densely be- 

 tween the eyes than posteriorly. Thorax as wide as 

 long, sides moderately arcuate in front, then parallel to 

 base, disc moderately coarsely and closely punctate, sur- 

 face uneven. Elytra more than half wider at base than 

 the thorax, nearly parallel, vaguely subcostulate, surface 

 coarsely and moderately closely punctate. Body beneath 

 much more finely punctate than above, rather sparsely on 

 the metasternum, more densely on the abdomen. Length 

 .50-. 72 inch.; 12. 5-18 mm. 



