STAPHYLINID^E. 87 



but they differ a good deal among themselves in antennal structure, 

 the first two being congeneric with longula in this and other respects, 

 but the last five are aberrant. Sexual characters are not distinct 

 except in callidula. 



Hydrosmecta dulcis n. sp. Slender, feebly convex, rather shining, ex- 

 tremely minutely and closely but inconspicuously punctulate, the abdomen 

 less closely; color dark piceous, the head and abdomen black, the elytra 

 moderately pale, infuscate basally, the legs pale; pubescence short, close; 

 head nearly as long as wide, parallel, rounded at base, the tempora fully as 

 long as the eyes, which are setose and not prominent, the carinae wholly 

 wanting; antennae rather pale red-brown, slender, rather long, only very 

 feebly incrassate, the ninth joint almost, the tenth fully, as long as wide, 

 the last elongate-oval, nearly as long as the two preceding, the second much 

 elongated, distinctly longer than the third ; prothorax very slightly transverse, 

 as wide as the head but evidently narrower than the elytra, parallel, slightly 

 widest anteriorly, with the sides feebly arcuate, the median line very ob- 

 soletely impressed ; elytra slightly transverse, much longer than the pro- 

 thorax; abdomen much narrower than the elytra, linear, elongate, parallel 

 and straight at the sides, the fifth tergite much longer than the fourth. 

 Length 1.75 mm.; width 0.3 mm. Wisconsin (Bayfield), \Vickham. 



The ninth and tenth antennal joints are mutually less unequal 

 and the eleventh relatively longer than in longula. 



Hydrosmecta caduca n. sp. Very slender, scarcely at all convex, aluta- 

 ceous, the abdomen more shining; color pale piceous-brown, the elytra still 

 paler, the abdomen clouded, except basally and at apex, the legs pale flavate; 

 sculpture very minute and close; head subquadrate, the eyes rather large, 

 convex and prominent, fully as long as the rather less prominent tempora, 

 the caring present but extremely short and basal; antennae rather pale, 

 very long, slender and filiform, not incrassate, the ninth joint much longer 

 than wide, the tenth still slightly longer, the last slender but much shorter 

 than the two preceding, the second longer than the third; prothorax nearly 

 as in dulcis; elytra about as long as wide, parallel, much longer as well as 

 wider than the prothorax; abdomen only moderately narrower than the 

 elytra, shorter, parallel though with somewhat arcuate sides; hind tarsi 

 short, the four basal joints short and equal. Length 1.6 mm.; width 0.27 

 mm. New York (Catskill Mts.). 



Readily distinguishable by its slender form and long slender fili- 

 form antennae. 



Hydrosmecta callidula n. sp. Larger and relatively stouter than either 

 of the preceding, rather depressed, moderately shining, the punctures ex- 

 tremely fine and close, sparse on the abdomen; color piceous, the elytra 

 but little paler, the legs pale flavate; head rather large, nearly as long as wide, 

 with an impressed central fovea, the eyes large, convex, more prominent 

 than the rounding and converging tempora, the carinae fine but complete 



