I2(i2 FAMILY I;V. — TENEBHIONin.T:. 



XIX. Platydema l.ap. 1881. (Gr., "broad + body.") 



Small or iiKMliiini-sized, broadly oval convex species having the 

 first joint of hind tarsi longer than the two following together; 

 epipleurie entire; mesosternuni, concave; last joint of maxillary 

 palpi broadly triangular, its inner and outer sides nearly equal; 

 intereoxal process of abdomen triangnbir. acute. They occur es- 

 pecially ou Heshy fungi about the base; of stumps or trees or be- 

 neath bark. Al)out 16 species are kn(-wii from the Tnited States, 

 ten of wdiich are known from Indiana, while anothci' may occur. 



KEY TO INDIANA SPKCIKS OF PLATYDEMA. 



(I. Head with horns or tubercU^s ; trout (•oiicave. 



Ji. Fpper surface bhiek, shinhig. 2332. excavatum. 



hi). I'liper surtacc [lieeoiis or dark re(hlish-tii-o\vii. (i|)a(iue. 



2333. ERYTHROCERA. 



(i(t. Head witliont tubercles or liorns. 



r. Thorax dull red. el.vtra bl.-ick. 2334. ruficoixe. 



cr. Thor;ix and elytra black. 

 '/. Surface oiia(iue. 



G. El.vtra without red sjiots. 



/. Aiiteiiiue wholly pale. 2335. ruficokne. 



//. Anteuine black, three basal joints pale. 233G. flavipes. 



ce. Elytra each with an oblique red spot on basal half. 



2337. ELLIPTICUM. 



d(l. Surface shining black. 



(1. I'rosternum horizontal, its apex prominent. 



//. Head with distinct transverse groove and frontal impressi ai. 



AMERICAN; .M. 



////. Head without transverse iiniiression. 



i. Thorax very sparsely punctured. 2338. l.evipes. 



ii. Thorax and intervals of elytra densely punctured. 



2339. MicANS. 

 <l<h rrosternnni convex between the coxa', its apex detlexed and ob- 

 tuse. 

 /. Elongate-oval; black with :i tn-onzed tinge; smaller, not over 

 ,5 mm. 2340. Picir^BRrM. 



ij. Uroadly oval; larger, (1-7 nun. 2341. subcostatim. 



*2.'!32 (7r)10). I'LATYDEMA EXCAVATUM Say. Journ. Phil. Acad. Nat. Sci.. 

 Ill, 1824. 207; ibid. II, 157. 



I'.roadly oval, convex. Black, shining; autenna^ and legs reddish-brown, 

 the latter Si.metimes pleeous. Head of male with two parallel, i>rnniinent. 

 cylindrical horns between tlu' eyes: front deeply concave between the bases 

 of the horns; head of female with tubercles instead of horns. Thorax more 

 than twice as wide as long, narrowed from base to apex, surface finely and 

 sparsely punctate. Elytra with rather finely punctured stria> : intervals fee- 

 bly convex, minutely punctured. Eength 4.5 .'..."» nun. 



Thrfui'dioiit the State; coitunon. •laniiafv ll-Octoher 11. 



