486 



lA.MII.V XH. TRICIK'PTERYGID.li. 



KKV TO INDIANA CKXEKA OF TRU'IIOl'TEHVCI D.K. 



a. Elytra entire. 



h. Thorax widest at base. 



c. I'v^idiiiiii iiivisilile: form oval, very convex: color dark. 



I. NO.S.SIDIIM. 



(•('. ryj^idiuiii visible beyond the i-lytra ; hind an.ules of thorax not 



elongate; form elonjrate; color pale. Xanosella. 

 bb. Thorax widest before the base. 



d. Pygidinni visible beyond the elytra. Ptilium. 

 dd. Pygidinni invisible. II. Ptenidum. 



(1)1. Klytra truncate. 



c. Antenna' very short, ".(-jointed; eyes wanting; thorax larger than 

 elytra. Ill- Limulodes. 



re. Antenna' elongate. 11-jointed. 

 /. Thorax widest at the base. 



(/. Abdomen with seven ventral segments. 1'tekvx. 



!/(). Abdomen with six ventral segments. 



/(. Hind coxa» very widely seitarated ; mesosternnui scarcely cari- 



nate; color pale. I'tineixodes. 



JiJi. Hind coxa" moderately separated: mesosternum distinctly cari- 



n;ite. IV. Thiciioi'Tervx. 



//. Thorax widest iiefore the base. 



/. Klytra long: mesosternum carinate: color dark. \'. S.michis. 

 ii. Klytra short: niesosternnm not carinate. 



/. P.ody (ip.Kine: alidonien moderate: hind cox.-r with plates. 



Xephanes. 

 //. P.ody translucent: abdomen very long: coh.r iiale. 



VI. Ptinelia. 



I. NossiDii'M Ericlis. 1845. ((jlr., "nest + formed. ") 

 Small oval, convex species having joints 1 and 2 of antennas very 

 laroe. ;^-8 slender, 9-11 much thiekened; abdomen with seven seg- 

 ments, entii'ely covered by elytra : metasternnm not reaching the 

 sides of the body. One of the two known species ocenrs in the 

 State. 

 034 (2914). NossiDH M amehuanum Mots., P.uU. Mosc.. 41. ISdS, 1!)1. 



Oblong-oval, very convex. Head and thorax 

 Iiiceous, strongly shining: elytra reddish-brown, 

 rather thickly clothed with long yellowish hairs; 

 legs and antcniue yellow. Thorax more than 

 twice as wide as long, hind angles re<^tangular : 

 sides rounded, distinctly margined, surface very 

 linely and s])arsely i(uncture<l. Elytra not wider 

 than thoiax. surface with rather deep, rugose 

 Iiunctures in sinuate transvi'rse rows: tips broad, 

 nuuli rounded. Eengtli 1 nun. ( Eig. 173.) 



Monroe ('oiiiily; rrcMpieiil. May IH-June 

 !). Taken by sifting debris of beech stnmp. 

 FiK. 173. X 34. (Original.) i*rol)ablv (jcctirs t liroimlioii t the State. 



