254 ^■A.Mll.^ \i. — iiydiioimi m.id.e. 



finely ;in(l sparsely inmctate. its sides broadly flattened; inodian si'oovo 

 wide and deep, discal f(!vea' separated, the hind ones obliiine and larger 

 than those in front; lateral ones broad, shallow and bnt slightly cnrved. 

 lOlytra with rows of large quadrate i)inictures. Length 1.5 mm. 



Ptttnajn County; rare. Oetoher 17. Sifted from debris at sidi^ 

 of hillside spring. ]\Ir. IManchaid. who eontpai'ed the specimen 

 with those at Cambridge, writes that "the short convex form is 

 (|uite different from any of onr named species." 



IV. HvnR.KNA Kug. 1704. (dr., "to wash or l)athe.") 



Our single member of this genns is smaller than any of those 

 belonging to the two preceding genera. Th(» thora.x is subquadrate, 

 about three-fourths the w'idth of elytra, and the latter are marked 

 with more than ten rows of punctures. 



4S<) (l.jSl'). IIVDIi.ENA PENNSYLVA.MCA Kll'S., LllUI. Euloni.. IV. 1S4C>. HIC. 



Elongate-oblong, snbeonvex. riceons or dark reddish-brown, the palpi, 

 legs and n.tirrow side margins of thorax dull yellow. Thorax narrower at 

 base than apex, side margins sinuate: disk eiarsi'ly and densely punetate 

 and with a large impression each side near front angles. I'nnetnrcs of ely- 

 tra] stria' elose. rather eoarse. (juadrate; intervals narrow, convex. Jiength 

 l.S-2.2 mm. 



Kosciusko County; scar<'e. .June 24. Sifted from (lam|), ch'- 

 caying sphagnum moss in tamai'aek swamp. 



'I"ril)e II. 1IY1>K()1M111,1.\1. 



Large oi' mcdiuiii sI/.mI beetles of an oval or elliptical convex 

 form, olive-black' in ( olor, rarel\- with sides of thorax and elytra 

 y(41()w. Elytra, not striate; antenna' !)-jointed; meso- and meta- 

 stt'rna. forming a continuous keel which is prolonged beliind inlo an 

 acute spine; middh^ and hind tarsi strongly compressed, fringed on 

 the inner side with long hairs. Three genera occur in Indiana. 



KEY TO GENEKA OF IIYni?OPHlLINI. 



(/. I'rosteriunn sulcate; metasternal spine long. 



b. Length LM or more nun.: last joint of maxillary paljii shorter than 



the ]ii-ece(ling. ^'. IIvorophilus. 



///*. I>ength less than il' mm.: tisl Joint of m.-ixillary jialin equal to or 



longer than preceding. W. 'riioPisTEimrs. 



(/(/. IM'ostermmi carinate; metasternnl spine short: lenglii i:; IC. mm. 



VII. IlYDROCHAHIS. 



V. TIvDKoPiTiLi's Ceoff. 171)4. (C,r.. "water i loving.") 



This genus includes two vvvy large black beetles, the giaitts of 

 the family as represent ed in Xorlli America. 



