STAPHYLINID^; 235 



The very deep and acutely incised notch of the sixth tergite in 

 the female type is as usual, but the lobe at each side of the opening 

 of the notch is very acutely angulate and not obtusely rounded, 

 as it is in the European erosa and also in americana. 



Deinopsis americana Kr. Stouter, much more convex anteriorly, 

 the pronotum very convex and strongly shining when denuded, dark 

 piceous to black in color, the punctures and pubescence nearly as usual, 

 the former very minute and feeble on the pronotum; head a little larger 

 than in harringtoni, the prothorax similar in general outline but very 

 much more convex and declivous anteriorly, not quite so transverse, 

 elytra equal in width to the prothorax, longer than in harringtoni, the 

 suture being evidently longer than the pronotum; abdomen nearly similar 

 though somewhat more tapering, the fifth tergite not more than three- 

 fifths as wide as the base. Length 2.6 mm.; width 0.95 mm. Virginia 

 (Fredericksburg) . 



From harringtoni the two females of this species before me differ 

 very much in the greater anterior convexity of the upper surface; 

 also in having the angle at each side of the deep acute incisure of 

 the sixth tergite obtusely rounded, as in the European erosa, but, 

 in the latter, the sixth ventral plate is different, being very broadly 

 trapezoidal at apex; here it is narrower, with the apex truncate. 



Deinopsis rapida n. sp. Form, lustre and sculpture very much as in 

 the preceding but darker in color, black or nearly so, the vestiture palish; 

 antennae long and very slender; prothorax toward base fully as wide as 

 the elytra or apparently somewhat wider, of the usual form, the hind 

 angles slightly prominent posteriorly and right; elytra shorter than usual, 

 the suture not quite so long as the pronotum; abdomen at base very nearly 

 as wide as the elytra, unusually feebly narrowed from base to apex, the 

 fifth tergite very large, almost as long as the two preceding and fully 

 three-fourths as wide as the base. Length 2.8 mm.; width 0.98 mm. 

 Iowa (Cedar Rapids), Brendel. 



The sixth tergite in the two male types is bilobed at tip, the 

 median notch acute but much shallower than in the female and less 

 abruptly limited at the sides than in the male of erosa, the lobes 

 being more rounded. The sixth ventral plate is much more broadly 

 truncate medially at apex than in the male of that species, where 

 the median truncature is narrow and feebly sinuate. 



In Deinopsis the remarkable even flat fringe of scale-like hairs 

 at the apex of each ventral segment is as in Gymnusa, but there 

 is no vestige of this singular character in Myll&na. 



