212 THE CANADIAN ENTOMOLOGIST. 



FAMILY HELOPID^E. 



Genus Meracantha Kirby. — Labrum transverse, scarcely emarginate ; 

 labium subtriangular, longitudinally and obtusely ridged in the middle 

 with a deep impression on each side ; mandibles bidentate ? at the apex ; 

 maxillae mutilated ; maxillary palpi first joint minute : second longer than 

 the rest, clavate ; third obconical \ fourth very large, securiform ; labial 

 palpi broken off ; mentum trapazoidal ; antennae filiform, scape incras- 

 sated ; pedicel obconical ; third joint longer than the rest, subcylindrical, 

 a little incrassated at the apex ; fourth shorter than the fifth, subobconical ; 

 fifth longer than the subsequent ones, elongate, obconical ; 6 — 10 

 obconical, gradually decreasing in length, and the 9th and 10th in thick- 

 ness ; nth ovate acute. 



Body ovate, convex, apterous. Head triangular ; front elevated on 

 each side at the eyes protecting the base of the antennae ; eyes large, 

 lateral, internally emarginate. Prothorax rather wider than long, narrowest 

 anteriorly, subquadrangular ; margined on the sides and anteriorly, margin 

 very slender. Scutellum an obtusangled triangle. Elytra with the 

 epipleura narrow, falciform ; shoulders incrassated, armed with a tooth ; 

 calcaria very short and scarcely visible. 



[238.] 323. Meracantha canadensis Kirby. — Length of body 6 

 lines. Taken in Canada by Dr. Bigsby. 



Body black-bronzed, naked, glossy, punctured : on the upper side of 

 the body the colour is more metallic. Head and prothorax confluently 

 punctured, two last joints of the antennae pale from hairs ; elytra slightly 

 furrowed, the sutural and the marginal furrows meeting at the apex and 

 including the rest ; furrows punctured ; interstices very minutely and 

 thinly punctured ; sides of the abdomen longitudinally wrinkled : tooth 

 of the shoulder short and wide, placed a little above the middle. 



FAMILY STENOCHIAD^E. 



Genus Arthromacra Kirby. — Labrum transverse ; labium dilated 

 above the insertion of the palpi, subemarginate : mandibles bidentate at 

 the apex ; maxillae bilobed ; lobes thick, obtuse ; maxillary palpi 

 incurved, four-jointed ; first joint minute ; second longer than the rest, 

 clavate ; third shorter than the fourth, triangular ; fourth very large 

 securiform, with the truncature oblique : labial palpi three-jointed, last 



