136 FAMILY IT. — cababid.t;. 



iiuiiiTssidiis Ions;, cui'ved ;niil sliiillow. not punctured. Elytral striit- very 

 tine, not puncturea : iutervjils tint : dcirsal punctures four, the tirst and sec- 

 ond on third stria, tlie otlicrs on second stria. Length 7-7..! mm. 



Lake ("lainty; scarce. About twenty specimens taken by "Wol- 

 cott near Wolf Lake. .Mai-ch 2(i. 



XXXIII. OLiSTiioPrs Dej. 182.3. (Gr.. "slippery + foot") 



Small piceous or brownish beetles of the tribe Platynini, having 

 the claws of the tarsi entire and the mentum without a tooth. But 

 twf) species are a.s yet known in the United States, one of which oc- 

 curs in Indiana. They are brieriy treated by 



LcContf.—Proc:. Phil. Acad. Xat. Sci., 1854. 58. 



Horn.— BnW, Brook. Entom. Soc. Y 1882. 63. 



*2.".7 (S:;!i). Olisthopi s pakmatus Say, 'lYans. Amer. Phil. S(X-.. II, ISi!, 

 4!>; ibid. II. 474. .>;7. 

 Uather broad. snbde]iressed. Head and thorax black; base of an- 

 lennu^. eilge of thorax. lej.,'s aii.d luisal halt of elytra dull brownish-yellow; 

 apical portion of elytra darker. Thorax rounded, one-half wider than long, 

 sides broadly rounded into base, margin very narrow, basal impressions 

 small and narrow. lOl.vtral stri;e rather flue, not punctured; intervals 

 slightly convex, the third with three very small dorsal punctures. Length 

 7-7.5 mm. 



Southern half of State, scarce : Lake County only in the north. 

 January 6-Xovember 7. The elytra are sometimes almost wholly 

 brownish-yellow. 



XXXIV Perigona Lap. 1837. (Gr., " around -i- angle."! 



Very small piceous or broAvnish beetles, having the labrum 

 square and flat; mentum deeply emarginate and without a tooth; 

 antenna? rather stout beyond the third joint, which is of the same 

 length as the second. The genus is treated by 



Horn. — Trans. Amer. Ent. Soc., XIX. 1892. 44. 



One species has been taken in Indiana, while another may occur. 



KEY TO SPECIES OF PEEIOONA. 



((. Mead alone piceous; elytra slightly oblong. xigricf.ps. 



an. Head and thorax piceous; elytra oval and more convex. 



2:^S. pallipe>-xis. 

 P nigriccps Dej.. length 2.."^ mm., is recorded from Cincinnati. 



l!:;s (fil'M)|. I'Kiuco.NA Pur.iPi.xxis Lee. Trans. .Vnier. I'hil. Soc, X, IS.")."., 

 :JS(3. 



Obhmg-nval, Head and thorax piceous; elytra dull reddish-brown; an- 

 tenuiB and legs pale yellow, Tlioiax sulxjuadrate, sliglitly wider than long; 



