•I'liM iiisi'i;k I'.i:i;'I'i-I':!^. 



601 



]]!;_' c'.icii. lliiKiiinA 1 (issi i,.\i;is S;i\, .IniiiMi. IMiil. Ac;mI. Nat. Sri., V, 

 is:.'.".. IT : iliiil. I I. i-'7l. ,^ 



Kfsciiililcs closrly llir | M-crcdi ii-. ( li iTcri ii'4 <inl\ in the ^^ VrMs^.-^ 

 striiitioii dl' llic cl.xlrn. 'I'lic liisl siria is sIkhI. (•xtcmliii;,' 

 not (ivrr ;i I'onrlli of Hu' t'lyti'a. tin" sccchkI still sli.irti'r iind 

 tlio tliird nirrcly a ti-a.c. Males willi ;i tlrcp pit near the? 



front aiiii-Ics dl' thorax, this lacking in I'lMnalcs. Lcii.L,'tli T- 

 <t.."i nnn. ( Fi.u;. I'.'IO.) 



SoutluM'ii half <>r Slatr; fro(|n(Mit. April G-June 

 27. Appoai's to lie much iiiofc coiiiinoii in spring. 11^,0:50. x .3. 

 This and Iho i)i-.'c(Mliii^' arc very close and time will (OriKinai.) 

 douhtlcss |)rovc that they aiv the same. Say's name liaving priority. 



Triho 11. IIISTKINI. 



To this tribe belong a. nunibei' of genera, whicli live mainly in 

 excrements or beneath l)ark. They vai-y inncii in form and have the 

 mandibles capable of iK'iiig api)li(Hl to Ihc front edge of the pro- 

 stennim so as to conceal the mouth. I'.etwee'i the prosternal lobe 

 and the prostei-nnm proper is a sutnr(\ so tliat the former appears 

 to be a distinct i)iece. In a nnmber of genera tlie lobe is very wide, 

 extending to the under edge of the thorax and forming the floor of 

 a cavity wliicli holds the antenna^ wlicn the lu'ctle is in repose. 

 AVhen so extended, the widened poi"ti(Mi is called the "pcndoral 

 plate." Six of the twelve known genera of the tribe are rei)n>- 

 sented in Indiana, Avhile a seventh probahly ocenrs. 



KKY TO l.NDIANA (a:\KI{A OF lllSTUTNT. 



a. .\nlennai cavities l.cnealli the Iront angles of the tliorax, open in fi'onf, 

 hilt closed nioi'e ei' less ((iniplelely heneath hy the pectoral plate. 

 h. Clul) of antenna' mere m- less <>val. pnhesceiit. and distinctly rinst'<l 

 or annulate : tiiei-a.\ witlmnl a lehe nn the side, 

 r. Mandililes vailier preminenl. npiier ed.^c lonnded : lalirnni trape- 

 zoidal; antenna! cinh hfeadly nval; elylfa distinct ly striate. 



ir. IIlSTKU. 



cc. Mandihles retracted, \ipper edu'e acnte: lal.nnn short, very trans- 

 verse. 

 (h P'orm ovate; elytra scarcely striate: prosternuni broad, the lobe 

 short; anteinial club truncate. III. Tribaus, 



(hi. Form more oblong; elytra distinctly striate; i)rosternum of mod- 

 erate width, the lobe distinct : antennal clnli rounded. 



IV. KriKKCs. 



hh. (hill of antenna" ol)conical. solid, -labrous; thor;i^\ with a distinct 



lobe on each side ; clypeus trnm-ate. V. IIet-Kiucs. 



(lit. Antennal cavities beneath the middle of the intlexed sides of the thorax. 



in front of the outer jiortion of the coxa\ not closed beneath by a 



pectoral plate. 



