THE SHORT-WINGED SCAVENGER BEETLES. 



473 



rounded so as to leave an angle in which the wings are visible; 

 fourth and sixth joints of antenna- smaller than the fifth and 

 seventh. No species is at hand from the State. T. fimbria! us Lee, 

 .7 mm. in length, dark reddish or chestnut-brown, legs slightly paler, 

 probably occurs in the northern counties. 



Tribe II. OSORIINI. 

 Rather stout, black or piceous, more or less cylindrical species 

 having the middle coxae contiguous ; tarsi 5- jointed ; mandibles stout, 

 not toothed; abdomen not margined. Our two genera are treated 

 by: 



LeConte.—In Trans. Amer. Ent. Soc. VI, 1877, 215-216. 



KEY TO GEN EE A OF OSORIINI. 



a. Front tibia? armed with spines ; body cylindrical, pubescent. 



LXXVI. Osorius. 



aa. Front tibise unarmed ; body subcylindrical, glabrous. 



LXXVII. Holotrochus. 



' LXXVI. Osorius Latr. 1829. 



Head almost as wide as thorax, the front more or less flattened 

 and sloping toward mouth; eyes small; antennae short, reaching 

 middle of thorax, first joint long, the others bead-like, gradually 

 larger. This genus is represented in the State by two of the three 

 known North American species. 



914 (2701). Osorius planifrons Lee, Trans. Amer. Ent. Soc, VI, 1877, 



215. 



Elongate, cylindrical. Black, shining; antennae, legs and elytra dark 

 reddish-brown. Head as wide as thorax, minutely granulate, finely and 

 sparsely punctate, front distinctly flattened. Thorax widest at apex, sides 

 straight and distinctly converging to base; disk sparsely and coarsely punc- 

 tate, with a wide, smooth median stripe. Elytra narrower at base than 

 thorax at apex, sparsely, coarsely and sballowly punctate. Abdomen as 

 wide as elytra, finely granulate, sparsely and coarsely punctate. Length 

 7-8 mm. 



Lawrence and Crawford counties; rare. May 17-May 23. Oc- 

 curs beneath stones and logs in damp places. A member of the 

 Austroriparian fauna. 



915 (2702). Osorius latipes Grav., Mon. Col. Micr., 1S06, 19S. 

 Elongate, cylindrical. Blackish-piceous, shining, rather thickly clothed 



with yellowish hairs; antennae and legs pale reddish-brown; thorax and 

 elytra often chestnut brown. Head as wide as thorax, rather coarsely and 

 more closely punctate; front less flattened. Thorax as in planifrons but 



