TIJi: FLAT BARK BEETLES. ~><>1 



Almost 400 species of the family are known, about (>0 of which, 

 distributed among 17 genera, are from the United States. These 

 are divided among five subfamilies, four of whieh are represented 

 in Indiana, 



KEY TO INDIANA SUBFAMILIES OF CUCUJ1D.E. 



. Front coxal cavities closed behind. 



1). Tarsi not lobed beneath, the fourth joint small ; antenme with dis- 

 tinct club, their third joint never longer, usually shorter than the 

 second. Subfamily I. SILVAMN.K. i>. 501. 



bb. Tarsi with the third joint lobed beneath; fourth tarsal joint very 

 small: antenna 1 long and slender, filiform; last joint of maxillary 

 palpi in our species large, hatchet-shaped. 



Subfamily IV. TELEPIIANIN.E. p. 501 . 

 aa. Front coxal cavities open behind; antenna- usually without club; the 



third joint longer than second (except in some L(nnophla'us). 

 c. Maxilke concealed by horny plates which extend out from the sides 

 of the month ; thorax as long or longer than broad. 



Subfamily II. PASSANDRIN/E, p. 504. 

 <<-. Maxilla- not concealed. Subfamily III. Crrr.TiN.E, p. 505. 



Subfamily I. SILVANINAE. 



Elongate, depressed brownish forms, less than 5 mm. in length, 

 having the tarsi 5-jointed in both sexes; the maxilla- 1 exposed. Three 

 genera occur in the State. 



KEY TO INDIANA GENERA OF SILVAN] N.K. 



<i. Club of antenn.-e formed by abrupt enlargement of last three joints; 

 form very slender; length less than 3 nun. 



h. The three joints of the club subequal. I. SILVANUS. 



" 

 hli. The middle joint of the club slightly larger than either of the other 



two. II. CATHARTIS. 



(id. Club formed by gradual enlargement of the joints; form broader; 



length 3.5-5 mm. III. NAUSIBITS. 



I. SILVANPS Lai. 1S07. ( L.. "pertaining to a wood or forest.") 



Small oblong or elongated species having the head snb<|iiadrate, 

 last joint of palpi obconical; antenna 1 with joints one and two 

 larger, three to seven smaller. snbe<|iial ; eighth smallest; nine to 

 eleven forming an abrupt loose club. Klytra with large round 

 punctures arranged in rows. They occur beneath bark, more es- 

 pecially that of oak, elm or poplar, or in grain. Four species are 

 known from the State. 



