478 FAMILY XI. STAPHYLINID^E. 



1)1). Wingless species; elytra very short, obliquely truncate at apex. 



ANGULARE. 



aa. Thorax very sparsely and obsoletely punctate; winged species: elytra 

 much longer than thorax. TENUE. 



921 (2808). ARPEDII-M CRIBATUM Fauv.. Bull. Soc. Linn.. II. 1878, 224. 

 Elongate-oval, depressed. Head black ; disk of thorax and elytra dark 



reddish-brown ; legs and narrow margins of thorax and elytra paler ; abdo- 

 men, under surface and autenme, except the base, piceous. Hetid about one- 

 half the width of thorax, sparsely and finely punctate. Thorax subquad- 

 rate, sides feebly curved, front angles rounded, hind ones obtuse, base al- 

 most as wide as apex. Elytra at base but slightly wider than thorax, reach- 

 ing almost to fourth segment of abdomen, coarsely, somewhat roughly, not 

 densely punctate. Abdomen smooth. Length 4.5-5 mm. 



Marion and Vigo counties; frequent locally. March 1-October 

 5. Occurs beneath bark of logs and dead leaves in damp places. 



922 (2809). ARPEDIUM SCHWARZII Fauv., Bull. Soc. Linn., II, 1878, 225. 



Elongate-oval, depressed. Dull brownish (or fuscous) yellow, mod- 

 erately shining; legs, sides of thorax and elytra slightly paler; antenna' 

 dusky, paler at base and apex. Thorax quadrate, scarcely wider than long ; 

 sides feebly curved ; disk finely and irregularly punctate, uneven, with three 

 or four smooth raised spaces near middle and a deep impression each side. 

 Elytra distinctly wider and more than twice as long as thorax, coarsely, 

 deeply, not closely punctate. Length 3.5-3.7 mm. 



Throughout the State; frequent. February 23-October 21. 

 Occurs beneath cover in damp places. The Acidnla subc&rinata of 

 my "Winter Insects." 



A. angular e Fauv., color and size of schwarzii and A. tenuc Lee., 

 blackish piceous in hue and 4-4.5 in length, are both boreal species, 

 taken in Michigan and probably occur in northern Indiana. 



AmpMcroum lit ri colic Lee., blackish to dull reddish-yellow in 

 hue, 3.7-5 mm. in length, occurs in abundance on flowers of Cra- 

 /<i(/us in Pennsylvania. 



TrnjonodctHus striatus Lee. is a southern form, also blackish 

 piceous, smooth, shining, length 4.5 mm., which has been recorded 

 from Cincinnati. 



Lathrimceum sordidiim Erichs., dull yellow, with piceous abdo- 

 men. 2.7 mm. in length, is also recorded from the same locality. 



LXXXII. OLOPIIRUM Erichs. 1838. (Gr., "bold.") 



Oblong-oval, convex, black or piceous species having the man- 

 dibles mid lihia 1 without teeth or spines; antenna 1 slender, as long 

 as head and thorax; elytra covering two-thirds of abdomen. One 

 species has been taken and another perhaps occurs in the State. 



