'I'm; (MinrxD i'.r;i:'i'r.i':R. 121 



!!m; iT'iIM. <'\i \riM s iMi'i \( I All s Say, 'I'l-aiis. Aiiicr. I'liil. Snr., II, lSli;i, 

 i:. ; il)i(l. II, 471. 

 Eloiijiatc-iiv.il r.la.l; m|- jiiiMiiis, sliiiiin.:;: aiitciiiia' and Icus pale red 

 dish-browii. 'I'liorax sli,i;IiU.v \vi(l(M- lliaii loii;;, sides Itroadly cm-vcd, hind 

 an.srles chtuscly ivaindcd. htisal iiiiprcssioiis nil puiiclurcd. lilyti'al stria? 

 dt'«'|i. iinl iiunrliiicii ; iiilffxals c.uiM'x, (he thifd will: I w u dislimi |iiinr 

 (iircs. Lcnulli lo.T) 1 1 ."i mm. 



Norllicni liaif (iT St;i1(' ; si-ai-i'c. -Iinic IT Aii'4iisl L'l. 



XXXIl. I'l.ATYXis Uoii. ISI:^. ((if.. "H;i1 or depressed.") 



A ItU'O'e ji'eniis of l)hiek. .urce!'. oi- Itroiized beetles of luediiini siz(; 

 and possessing the characters of the tribe. Fali)i slender, with the 

 last two joints snbequal; first, third and fourth joints of antenna' 

 of about the same length. Body usually somewhat slender witb 

 the elytra nearly twice as wide as the head or thorax. Thorax veiy 

 variable in form, being either oval, cordate, scjuare or rounded; 

 the margin sometimes barely visible. Elytra oval or oblong, some- 

 times elliptical, usually slightly sinuate at apex, sometimes almost 

 truncate; the interval between the second and third stria' with from 

 three to seven dorsal punctures. 



The members of the genus oceui- beneath cover in all kinds of 

 situations, some species lieing found only along the margins of 

 ponds, streams and lakes, others in high. di-y upland woods, and 

 still others only in sandy locations. A number are known to hiber- 

 nate as imagoes. The two papers treatin.g of the species of the 

 United States fauna are as f ollov/s : 



LeConte. — "Synopsis of the Species of Platynus and Allied 

 Genera Inhabiting the United States." in Proc. Phil. Acad. 

 Nat. Sc.i., VII, 1854. 35. 



LeCoiite. — ^''' Synopsis of the North American Species of Platy- 

 nus," in Bull. Brook. Entom. Soc, II. 1879, 43-58. 



About 90 species of Platynvis have been described fi'om the 

 United States. Of these 41 are known to occur in Indiana. Since 

 the number of species is so large, the genus in the table which fol- 

 lows is first divided into groups, and these in turn into species. 



KI'JY TO GliOlPS OF INDIANA PLATYNIS. 



(I. I'Mytra oval witlmut Immci'al aui^'les: side piect's nf iiielatliorax slin-l. 



not ruiicli longer than wide: thorax ovate, narrowed behind, usnally 



strongly margined at sides. Gronp .1. 



««. Elytra with liroadly ronnded humeral angles; sid(> jiieces of nietatheriix 



longer than wide. 



ft. Hind angles of thorax not rounded. 



c. Front tarsi without gr iMves. middle and hind tarsi with grooves 

 on the sides; thora.x narrowed heliind. Group B. 



