518 SUBFAMILY XII. COSSOXIX.E. 



Subfamily XII. COSSONIN/-E. 

 THE BROAD-XOSEI* BARK BEETLES. 



This subfamily, as here treated, is equivalent to the Cossonina? 

 of LeConte with the Acamptini added. Its strongest characters 

 are in the normal mouth parts and modified antenna? which de- 

 part from the form seen in Curculionino 1 either by reduction in 

 number of funicular joints or by enlargement and loss of pubes- 

 cence in first joint of club. A prolongation of the inner apical 

 angle of the tibia 1 into a long curved spine or hook is also usual, 

 and the tarsi are usually narrow with feebly emarginate or sim- 

 ple third joint. These characters are to a great extent, duplicated 

 in the snbtribe Hydronomi (p. 221), especially in Lissorhoptrus 

 and fiagous; the student must therefore exercise care in compar- 

 ing the descriptions. 



The members of the subfamily are small oblong or elongate 

 black or brown species having the eyes small, sometimes wanting; 

 beak variable in length, often very short and broad; antenna 1 

 variable, both in insertion and structure, the scape generally 

 reaching to or beyond the eyes; club small, oval, feebly annulated; 

 elytra long, conjointly rounded at tip, concealing the pygidium ; 

 first and second ventral segments each much longer than third 

 and fourth united ; femora unarmed. The species live mostly 

 beneath bark of dead trees, though certain genera occur only 

 along the coast, living in old boards, roots, etc., washed upon the 

 beach. In addition to the papers of Horn and LeConte men- 

 tioned under Calandrina?, our species are treated in part by 



Casci/, TJios. L. "Ooleop Notices, IV, Cossoninre," in Ann. 

 X. Y. Acad. Sci., VI, 1892, G89 TOT. 



Van Dyke, Eflirin ('. ''The Species of Cossonus Clairv. of 

 America North of Mexico," in Bull. Brook. Ent. Soc., X, 

 1915, 12:!. 



Canistcs selinxtcri Casey, of the tribe Cryptorhynchiui, has 

 many characters suggestive of this subfamily. LeConte (18T6, 

 329) regarded the Cossonina 1 as a connecting line from Hylobiini 

 to Scolytidfp, to which family the tribe Rhyncolini are closely 

 related, both in appearance and habits. 



KKV TO THIBES OF SUBFAMILY COSSONINAK. 



a. Body uneven, covered with a crust. 



&. Beak short, stout, resting in repose upon the front coxa;; surface 

 with stout erect bristles. Tribe I. ACAMPTINI, p. 519. 



bl). Beak long, not dilated at tip; surface without erect bristles. 



c. Funicle 7- or 8-joiuted. Tribe II. ANCIIOXIXI, p. 520. 



cc. Funicle 4- or 5-jointed. Tribe III. DRYOPHTIIOIUXI, p. 523. 



