TiiK snoiri'-\vi\(;i;i) srAVK\f!i:i! isKirrr.Ks. 401 



Caseji, Thos. L. — "Revision of tlic Slctiini nl" AiihtIi-;) Xoftli nl' 

 Mexico." 18S4. pp. 1-20fi. f f>iil)lislic(I priviildy. ) 



Two erenern coiiiprise the suM'iiiiiily. both ol' wliicli arc reprc- 

 st'iilcd ill Iii(|i;nia. 



KKY TO GFNKRA OK STKNIN/K. 



'/. rarajrlossM no) narrowed at base; cheeks iirdmiiieiil ; (^lytra oaeh with 

 a larfre rtHldish-yeUow si)ot. XLT. DiANors. 



uu. Paraglossa strongly narrowed a1 base; cheeks very small, nsnally in- 

 visible fnan above. XLIT. Stenus. 



XLT. DiAxors Leach. 1810. (Gr.. "to meditate") 



Rather robust species having' the eyes smaller and more widely 

 separated than in Sic mis; antennae long and slender; abdomen 

 strongly margined at the sides. Two species are known from the 

 Ignited States, one of whicli has been taken in the State, while the 

 other. Z>. cdcrulrscens G-yll. has been taken about the Great Lakes 

 and probably occurs in northern Indiana. 



KEY TO SPECIES OF DIANOUS. 



(/. Elytra scarcely longer than wide; punctuation coarse and sparse. 



777. NITIDULUS. 



au. Elytra distinctly longer than wide: punctuation fine and dense. 



CCERULESCENS. 



777 (2301). DiANOUs nitidi lis Lee., Proc. Bost. Soc. Nat. Hist. XVI. 

 1874, 272. 

 Black or dark steel blue; elytra each with a large rounded pale spot 

 behind the middle; pubescence very fine and sjiarse, visible only on head 

 and abdomen. Head with two wide, shallow grooves betw'een the eyes, 

 separated by a convex ridge ; finely and rather closely punctured. An- 

 tennjB reaching middle of thorax, third joint one-half longer than fourth. 

 Thorax subcylindrical, widest at middle, narrower at base than apex, with- 

 out median impression; surface rather coiirsel.v. not closely punctate. Ely- 

 tra slightly narrower than head, coarsely, rather sparsely and evenly punc- 

 tate, the punctures separat(Ml by twice their own width. Abdomen finely 

 and sparsely punctate. IjCngth 4.5 mm. 



Floyd County: scarce. Octohci- 4-()ctobei" 0. Taken beneath 

 stones on llu' bank of the Oliio River. 



XLll. Stkni s Lat. 17!»H. (Gr.. "narrow.") 



A very large genus of closely related forms wliidi for conven- 

 ience are sejoarated into the follownig groups; 



