530 COLEOPTERA OF NORTH AMERICA. 



Group III. — Brachytarsi. 



In this group tlie beak is g-radually narrowed from the eyes 

 forwards, so as to become trapezoidal in form ; the antennal 

 cavities extend to the eyes, vvhi(;h are coarsely granulated and 

 emarginate in front. The first and second joints of the antennae 

 are stout, the second a little longer, 3-8 shorter, gradually a little 

 wider; 9-11 much wider, forming an oval compressed sensitive 

 club. Prothorax rounded in front, overhanging the head, basal 

 ridges flexed rectangularly at the angles, but extending only a 

 very short distance along the sides; inferior basal margin acute. 

 Elytra with even and equal interspaces. Tarsi with the first joint 

 scarcely longer than the second, which is triangular and emargi- 

 nate ; third deeply bilobed, not narrower than the second, claws 

 toothed near the tip, so as to appear cleft. Mentum deeply 

 emarginate with lobes, rounded at tip ; gula transversely im- 

 pressed. 



Our species, which occur in the Atlantic region, represent two 

 genera. 



Ba.sal ridge flexed abi'ui)tly forwards at the hind aiigh^s, and continued 

 along tlie sides of the prothorax for a short distance. Brachy tarsus. 

 Basal ridge gently rounded and becoming obsolete at the hind angles. 



Anthribulus. 



Tribe 111.— AR^OCERIWI. 



But two genera of this tribe have occurred in our fauna ; they 

 are of small size, and are easily known by the antennse being 

 inserted in small fovea? upon the upper surface of the beak. The 

 transverse carina of the prothorax as in the preceding tribe is 

 l)asal, suddenly flexed, forming a right angle, and extended a 

 short distance along the sides ; the antennas are slender, and the 

 last three joints form a loose club. The elytra are regularly 

 striate as in all the preceding tribes and groups of the family. 



Antennae with second joint shorter than the first. Araeocerus. 



Antennae with second joint as long as the first, elytra striate. Choragus. 



Arseocerxis fasciciilatus has become cosmopolitan in articles 

 of commerce. Choragus occurs in the Atlantic States. 



