,);>8 FAMILY XX. — Rin RSODID.E. 



;iiit('iiii;i'. usually i-cccivcd iu a ra\il.\' al llic apical aujzlr of the llio- 

 rax, ;ni(! Iln' widely scpai'atcd cdxa'. F'wc ejcnci-a arc recognized Uy 

 Casey/'' While no lueinltcr of the Irihe has as yet been noted from 

 Indiana, two of the g:enei'a. each ol w hich. contains a single species, 

 may he i'e|)i-eseM(ed in the Slate. 



KKV TO INDIANA GENERA OF MlK.Nr U)! I M. 



(I. Aiiteunnl cavities visiMe rroiu above; prosterual lobe large, completely 

 (•(iuce.-ilin.^ tile Inhnini and mouth |iarts iu re]>ose: lej;s strongly re- 

 tractile. MURMIDII'.S. 

 (HI. Antenual cavities visiliie in Irenl. 1ml Udl from above; prosternal lobe 

 truncate, not coucealiny the nidutli parts; legs free. Mychocerus. 



Murniullus nnills l>eck.. hi'ownish, shining, elytra with I'ows of 

 distant pnnctiires, length l.."i nnn.. is widely dispersed by commerce. 



Mi/choccriis depressus Lee. reddish-brown, depressed, length 1 

 mm., is a rare sonthern species which has been taken near Cincin- 

 nati. 



Family XX. RIIYSSODTD.K. 

 The WmNiiLEti Baric Beetles. 



This family comprises only fonr North American species, two 

 from each side of the continent. The name of the family is founded 

 upon that of the typical gentis Rhjjssodes, meaning "wrinkled- 

 form, ' ' and doubtless refers to the deep grooves of head and thorax. 

 They are narrow, elongate, somewhat flattened brown beetles having 

 the head strongly constricted behind into a neck, and furrowed by 

 two deep grooves ; antenna? composed of 1 1 nearly equal rounded 

 joints (Fig. 4, No. 12), inserted under the frontal margin; thorax 

 long, deeply grooved; scutellum wanting; elytra rounded at tip, 

 covering the abdomen ; front coxal cavities widely separated, closed 

 behind; a])donien with six ventral segments, the first broadly trian- 

 gular, widely se|)araling the coxa'; legs short, the front tibife ter- 

 minated ])y two hooks; tarsi H-jointed, ver}' slightly pubescent be- 

 neath. 



The principal papei- treating of the family is the following: 



Le(U)iUf.—''Note^ on the Rhyssodida' of the IT. R.," iy, Trans. 

 Amer. Ent. Soc. V, 1875, 162-168. 



The two species of the Atlantic slope both occur in Indiana, 

 living under hark of decaying logs. They belong to different 

 genera, separated as follows: 



♦Ann N". Y. Acad. Sci., VIII, ISO.'), ^I 



