238 NORTHERN ZOOLOGY. 



(323) 1. * Meracantha canadensis. Canada Meracantha. 



M. (canadensis) nigro-anea, glabra, nitida, punctata : elytris striatis : striis punctatis ; interstitiis punctulatis. 

 Canada Meracantha, black-bronzed, naked, glossy, punctured ; elytra furrowed, furrows punctured ; interstices minutely 

 punctured. 



Length of the body 6 lines. 



Taken in Canada by Dr. Bigsby. 



DESCRIPTION. 



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 antennas 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 STENOCHIADJE. Stenockiadans. 



CXXIX. * Genus ARTHROMACRA. 



Labrum transverse. 



Labium dilated above the insertion of the palpi, subemarginate. 



Mandibles bidentate at the apex. 



Maxilla, 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. 

 I,abial palpi three-jointed, last joint securiform. 

 Mentum obtriangular. 

 Antenna; filiform, eleven-jointed : scape short, incrassated ; pedicel short, incrassated at the apex ; 



joints 3 — 8 obconical, nearly twice the length of the pedicel ; last joint cylindrical, downy, 



as long as the five antecedent ones taken together. 

 Body long and slender. Head triangular ; eyes kidney-shaped. Prothorax cylindrical not wider 

 than the head. Scutellum rounded. Elytra wider than the thorax, linear. Legs slender ; tarsi 

 very long. 



This genus is sufficiently distinguished from Stenochia, which it a good deal resembles, by the 

 remarkable length of the last joint of the antennae, which occupies more than a fourth part of the 

 whole length. 



