672 FAMILY XXXI. 15YRR1IID.K. 



coxal cavities open behind; hind coxa? extending to the margin of 

 the body, transverse ;md dilated into a plate partly protecting the 

 hind thighs; tarsi short, five-jointed, last joint nearly as long as the 

 others united. 



The literature treating of the North American species is as 

 follows : 



LrConlc. "Synopsis of the J>yrrhida j of the Tinted States," in 

 Proc. Phil. Acad. Nat. Sci.. VII. 1M54. 113-117. 



Horn. ''Table of Species of Limnichus," in Bull. V. S. Geol. 

 Survey, V, 1879, 514. 



('<ixrij. "Limnichus," Synopsis of," /// Ann. N. Y. Acad. Sci., 

 V, 1890, 145-160. 



Forty-six species, distributed among 11 genera, represent the 

 family in the United States. Of these 8 species, belonging to four 

 genera, have been taken in Indiana. 



KEY TO INDIANA GENERA OF BYRRIIID.E. 



(/. Head prominent ; meutnm large, elongate, semi-elliptical, coarsely punc- 

 tate, entirely closing the mouth below. I. XOSODENDRON. 

 . Head retracted: mentmn small, quadrate, largely exposing the base of 



the maxilla?. 

 l>. Antenna? 11-jointed. clnvate ; lower face or epistoma not distinct ; size 



medium, 5 or more mm. 



c. Front tarsi only retractile. II. CYTILUS. 



cc. All the tarsi retractile. III. BYRRIII s. 



bb. Antenna 1 KVjoiiited : episttuna corneus. separated by a line suture; 



size small, less than .'! mm. IV. LIMNICIH s. 



I. NOSODENDROX Lat. 1807. f'Gr., "disease 4 tree.") 



This genus comprises two oval, convex beetles, having the head 

 advanced in front; mentum as described in key ; antenna 1 11-jointed. 

 situated under the side of head. They live beneath the bark of 

 trees. One of the two occurs in Indiana. 



1l's7 CiSTG). NOSODENDRON rxicoum Say. Long's Expecl. to St. Peter's Kiv.. 



II, 274; ibid. I, ISO. 



Kounded-ovnl, strongly convex. Black, somewhat shining: anteunse pic- 

 eons. Above uniformly, rather densely and coarsely punctate, more spar- 

 ingly and coarsely beneath. Elytra not striate but witli rows of short, 

 si iff, erect yellowish hairs, plainly visible only in side light. Length f>- 

 fi.T mm. 



Lake, Putnam. Crawford and Posey counties; scarce. April 

 22-July 4. 



