STAPHYLINID^: 241 



One of the most remarkable of our species in its large prothorax, 

 very short elytra, feebly tapering abdomen, small size and other 

 features as stated. 



Myllaena decreta n. sp. Small, stout, convex, strongly attenuate 

 behind, brown in color, the abdomen blackish, pale at apex; surface 

 slightly shining, the minute punctures only moderately dense and the 

 short palish hairs well separated; head three-fifths as wide as the pro- 

 thorax, the antennae (cf) pale, notably short, rather stout, distinctly 

 and rather strongly incrassate distally, the tenth joint about as long as 

 wide; prothorax large, one-half wider than long, rather strongly narrowed 

 apically, widest near the base, the sides rounded, the base feebly arcuate, 

 becoming slightly sinuate laterally, the angles obtuse and somewhat 

 blunt; elytra slightly narrower than the widest part of the prothorax, 

 short, the suture less than two-thirds as long as the pronotum, the sinuses 

 at apex moderately deep; abdomen at base almost as wide as the elytra, 

 rapidly and evenly conical, with thin margins, the fifth tergite slightly 

 more than half as wide as the base, the sixth obtuse at tip, the sixth 

 ventral (cf ) narrowly and strongly rounded at tip. Length 1.3-1.6 mm.; 

 width 0.36-0.52 mm. California (Truckee). 



Recognizable by its incrassate antennae, rapidly tapering abdo- 

 men, well developed prothorax and rather loose punctuation. 



Myllaena impellens n. sp. Small, rather convex and stout in form, 

 slightly shining, the sculpture and vestiture nearly as in the preceding; 

 color piceous-brown to paler, the abdomen blackish, paler at apex; 

 head as in decreta, the short antennae (cf ) dark in color, only very mod- 

 erately incrassate distally and with their vestiture composed of less 

 close-set, coarser and more bristling hairs, the tenth joint about as long 

 as wide; prothorax notably shorter, two-thirds wider than long, other- 

 wide nearly similar, the lustre more shining; elytra short, fully as wide 

 as any part of the prothorax, the suture about two-thirds as long as 

 the latter, the apical sinuses well developed; abdomen at base nearly 

 as wide as the elytra, rapidly tapering, with thin margins, the fifth tergite 

 but little more than half as wide as the base, the sixth rather narrowly 

 angularly produced but with the angle blunt, the sixth ventral (cf ) 

 strongly rounded, with the short apical series of minute serrules distinct. 

 Length 1.2-1.75 mm.; width 0.34-0.6 mm. California (Hoopa Valley, 

 Humboldt Co.). 



Well distinguished from the last by its shorter prothorax, less 

 incrassate antennas and still more shining surface lustre. It seems 

 to vary in size even to a greater degree than usual. 



Myllaena brevicollis n. sp. Nearly similar in form and convexity 

 to the preceding but less shining, dullish because of the rather dense 

 punctures, the vestiture moderately short, palish, the coloration nearly 

 similar; head almost three-fifths as wide as the prothorax, the antenna? 

 dark brown, short, distinctly incrassate, the tenth joint not quite so 



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



