STAPHYLINID^E 225 



Tetralina helense n. sp. Rather stout, dull in lustre, black, the elytra 

 very faintly picescent, the legs pale brown; punctures minute, close, 

 feebly asperulate, even closer throughout the abdomen though much 

 finer and not asperulate; pubescence short, giving a grayish tint; head 

 much wider than long, more than three-fourths as wide as the prothorax, 

 the eyes very large, prominent, at less than a third of their length from 

 the base, the short tempora rapidly converging behind them; antennae 

 black, extending nearly to the middle of the elytra, slender, gradually and 

 feebly incrassate, the first three joints subequal in length, the first much 

 the thickest, fourth shorter, one-half, the fifth a third, longer than wide, 

 the ninth nearly as long as wide, the tenth evidently wider than long, the 

 last gradually acute apically and as long as the two preceding; prothorax 

 a third wider than long, parallel, the sides gradually rounding and con- 

 verging in about apical, and very feebly converging and nearly straight 

 in basal, half, the basal angles obtuse but distinct, the base rounded, the 

 apex subtruncate, the surface feebly impressed along the median line 

 from base nearly to the apex; elytra large, slightly transverse, with very 

 feebly diverging sides, at base a sixth wider, the suture a third longer, 

 than the prothorax; abdomen at base distinctly narrower than the elytra, 

 thence distinctly narrowing to the fifth tergite, with feebly arcuate sides, 

 the sixth segment abruptly much narrower, the dorsal plate broadly 

 rounded, the ventral truncate and with rounded angles in the type. 

 Length 2.1 mm.; width 0.62 mm. Montana (Helena), Wickham. 



To be known by the long legs and filiform tarsi, black color, dull 

 lustre, large convex eyes and other characters as detailed above. 

 The sex of the type is probably female. 



Tetralina filitarsis n. sp. Form, coloration and sculpture nearly as 

 in the preceding but smaller, much less stout, with still more developed 

 elytra and blackish legs; head not quite so transverse, fully four-fifths 

 as wide as the prothorax, the eyes not so large but prominent, at nearly 

 half their length from the base, the tempora subparallel for a very short 

 distance, then strongly and obliquely rounded to the base; antennae 

 piceous-black, extending to the tips of the elytra, more slender and not 

 distinctly incrassate, subfiliform, the fourth joint three-fourths, the 

 tenth one-fourth, longer than wide, the last slender, acutely pointed, 

 as long as the two preceding; prothorax relatively smaller than in the 

 preceding and more than two-fifths wider than long, otherwise nearly 

 similar, except that the impression along the median line extends from 

 apex to base and is much broader, feebly concave and parallel, with the 

 asperities in the concavity sparser than elsewhere; elytra shorter than 

 wide, nearly parallel, a fourth wider, the suture almost two-fifths longer, 

 than the prothorax; abdomen almost as in helencs but narrower, the 

 sixth segment in the type relatively not so narrow, with the broader 

 truncate ventral plate projecting posteriorly much more beyond the 

 dorsal. Length 1.76 mm.; width 0.45 mm. Montana (Kalispell), 

 Wickham. 



T. L. Casey, Mem. Col. II, August 1911. 



