896 FAMii-v xr.ii. — cioiD.T':. 



typical genus, ('is, which is from a Grcjk word nieaning' "a worm 

 in wood or grain. " The beetles are mostly found under the bark of 

 trees and in dry and woody species of fungi, and are usually 

 gregarious. Some species occur in houses and are injurious in the 

 larval stage to books, furniture and old woodwork, which they 

 pierce with small round holes. Tbe grubs which prey upon l)Ooks 

 are known as ''l)ook-worn]s." 



The principal characters by wliicli the Cioidip may be known are 

 the 8- to 10-jointed antenna:' (ll-jointed in one genus), inserted at 

 the front margin cf the eyes, the last three joints larger, forming a 

 loose club; eyes rounded, somewhat granulate; thorax with side 

 margins distinct, cylindrical, rounded in front, and frecpiently pro- 

 longed over the liead. P]lytra entii'cly covering the abdomen, the 

 latter with five free ventral segments, the first longer than the 

 others; front and middle coxip oval, not ]irondnent, without troch- 

 antins, the cavities small, separate, nai-rowly closed behind; legs 

 moderately short; tarsi four-jointed, joints 1-3 very short, equal, 

 fourth long with simple claws. 



The principal available paper treating of the North American 

 species is that by 



CaseiJ. — "Studies in the Ptinida% f'ioida- and Si)hindida' of 

 America," in Journ. N. Y. Entom. Soc, VI, 1898, 61-93. 



Of the nine genera recounized by Casey, representatives of seven 

 have been taken in Indmna. 



IvEY TO INDIANA GENERA OF CIOID.E. 



a. Anteimop with last tiiroe joints larger, forming a loose club. 

 1). Antenna? 10-jointecl. 



c. Prosternum simple or nearly so. 



(J. Body with distinct erect bristly hairs; front tibia^ usually ]iro- 



duced and toothed on outer side at apex. I. Cis. 



(Id. Body glabrous or minutely pubescent; front tibite not toothed 



or produced ; body elongate ; head and thorax simple in male. 



II. Orthocis. 

 cc. I'rostenmm carinate along the middle; budy either glabrous or 

 with short decumbent pubescence. HI. Xestocis. 



Z>?>. Antenna' S;- or 9-jointed ; body glalirous. 



c. Front tibi;c thickened and rounded ou the outer side. 

 f. An1('nii;i' n-.i<iin1ed; body narrow, cylindrical. 



I \'. FiNNKAU'IllltON. 



//. Anlciiii;r s Joinlcd. V. Ceracis. 



rr. Froiil 1ilii;c nnrrowiy (riangiilar. Ihc .mler edge straight and 



iiiiii!ilcl\ spinulnsc: anlcnn.c S Joinlcd. VF. Octotemnts. 



(Id. Antcmijc wilh joinls .5 (o 11 forming a large peclinale mass, ll-jointed; 



elytra sulcate. VII. Bhipidandrus. 



