672 FAMILY XXX r. — byrrhid/t;. 



coxal cavities open behind; hind coxfR extending to the margin of 

 the body, transverse and 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 : 



LeConte. — "Synopsis of the l*>y rrhidffi of the United States," in 



Proc. Phil. Acad. Nat. Sci., VII, 1854, 113-117. 

 Horn. — '"'Table of Species 'Oi Limniehus," in Bull. IT. S. Geol. 



Survey, V, 1879, 514. 

 Casey. — "Limniehus," Synorwi.s of," in Ann. N. Y. Acad. Sci., 



V, 1890, 145-160. 

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

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

 genera, have been taken in Indiana. 



KEY TO INDIANA GENEEA OF BYEEHID^. 



a. Head prominent ; mentum large, elongate, semi-elliptical, coarsely punc- 

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

 aa. Head retracted; mentum small, quadrate, largely exposing the base of 

 the maxillie. 

 6. Antennffi 11-jointed, clavate ; lowev face or epistoma not distinct ; size 

 medium, 5 or more mm. 

 c. Front tarsi only retractile. II. Cytilus. 

 cc. All the tarsi retractile. III. Bykehi's. 

 66. Antennce lO-jointed ; epistoma cornens, separated by a fine suture; 

 size small, less than .3 mm. lY. Limnichc'S. 



I. NosoDEi^DEON Lat. 1807. (Gr., "disease -f tree.") 



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

 advanced in front ; mentum as described in key ; antenna^ 11-jointed, 

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

 trees. One of the two occurs in Indinna. 



1287 (3876). Nosodendron unicolor Say, Long's Exped. to St. Peter's Eiv., 

 II, 274 ; ibid. I, 180. 

 Rounded-oval, strongly convex. Black, somewhat shining ; autennce pic- 

 eous. Above uniformly, rather densely nnd coarsely punctate, more spar- 

 ingly and coarsely beneath. Elytra not striate but ^\ith rows of short, 

 stilt, erect yellowish hairs, plainly visUilp only in side light. Length 5- 

 5.7 mm. 



Lake, Putnam. Crawford and Poscv counties; scarce April 

 22-July 4. 



