■nil: i''i.\'i' r.AK'K r.i:i'"i'i,i':s. 



r.(ii 



Aliiidsl }i'() si»('('ics tif liic r.-iiiiily ;irc known, iiIkmiI (i(> nl' wliicli. 

 (listril)nli'(l ;iiii(iii-j 17 genera, ai'c IVoiii the rnitcd States. Tlu>s<! 

 arc divided aiinui>:' live snhramilics. fdiir (d" wliicii arc i-(<prosonte(l 

 in Tndiaiia. 



KKV TO INDIANA SIHFAMII.IES 01'' CUCUJJD.K. 



a. Front cnxal cnvitios closed behiiid. 



b. Tarsi imt lol.ed beneath. IIh' loui-lli .joint small; antennie with dis- 



tinct ihih. tlieir third joint never lon.u;er. nsnally shorter than the 

 secon<l. Snlifaiuily I. Sii.vanin.t^, p. 501. 



hJ). Tarsi with tlie tliinl joint lolicd beneatli; I'onrtli tarsal joint very 

 small: antenna' lon.u and slender, lilil'orm; last joint of nnixillary 

 jialiti in i>in- species lai-.irc. liatchet-sliai>ed. 



Subfamily IV. Tki.kpiianin.e. ]k .'>c.'.i. 

 ltd. Front coxal cavities open lieliind; antenna' nsnally without clnb ; the 

 third joint longer than second (except in some LdDiophhjcus). 



c. Maxilkr? concealed by horny plates which extend ont from tiie sides 



of the ninntli: tliorax as long or longer than broad. 



Subfamily II. Passandrin.15, ]). 564. 

 cc. IMaxilhe not conceale<l. Subfamily III. Ci-cjt.tin.k, p. 505. 



Subfamily I. SILVANINAE. 



Eloiiii'atc, dci)resscd l)r(twiiisli forms, less than 5 mm. in length, 

 liaxang the tarsi 5-jointed in both sexes ; the maxilla' exposed. Three 

 genera oeenr in the State. 



KEY TO INDIANA GKNERA OF S1LVANIN.-E. 



</. Club of antenn:e formed by abrupt eulargenuMit of last Ihrce jeints; 



form very slender ; length less than 3 mm. 



h. The three joints of the clnb subequal. I. Silvani's. 



hJ). The nuddle joint of the club slightly I.ii-ger than either of the other 



two. II. Catharti s. 



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



length ."..5 5 nun. III. Nausibius. 



I. SiLVAxrs Tat. I.'^OT. (L.. "itcrtainiiig to a wood or forest.") 



Small oblong or elongated species lia\'ing the head snl)(|uadrate. 

 last joint of ]ialpi obconical ; aidciiiia' with joints one atid two 

 hirger. three to seven smaller. sul)(M|iial: eighth smallest; nine to 

 eleven forming an abrni^t loose club. Elytra with hirge round 

 punctures arranged in i-ows. They occur beneath bark', more es- 

 l)eeially that of oak. elm or poplar, or in grain, h'iuir species are 

 known from the State. 



