460 



FAMILY XI. STAPHYLINIDJE. 



b. Legs black. 



c. Sides of thorax feebly rounded ; elytra pale, with suture, sides and 



.a narrow stripe black. majok. 

 cc. Sides of thorax much rounded; elytra wholly black. 



888. STYGICUS. 



bb. Legs yellow. 



d. Color above wholly or in great part black or piceous. 

 e. Elytra in part at least dull yellow. 



f. Suture and sides of elytra black. 889. vjttatus. 



ff. Suture and outer apical angles black. fasciatus. 

 ee. Elytra wholly black ; under surface pale yellow. bicoloe. 

 del. Color above reddish-yellow. 



g. Sides of elytra fuscous. 890. lateralis. 



gg. Spot on head, two on thorax and part of dorsal surface of ab- 

 domen, black. 891. occipitalis. 



0. femoralis Grav., 7-7.5 mm. and 0. major Grav., 9 mm. in 

 length, have both been recorded by Dury from Cincinnati. 



888 (2692). Oxypoeus stygicus Say, Trans. Amer. Phil. Soc, IV, 1834, 

 459 ; ibid. II, 575. 



Elongate, rather robust. Black, strongly shining; antennae piceous, 

 joints 2 to 5 and the tarsi reddish-brown. Thorax widest at middle, thence 

 much narrowed to base, sides strongly rounded ; surface, as well as that of 

 head, smooth. Elytra together one-half wider and one-third longer than 

 thorax, each with a subsutural and two discal striae, the former finely, the 

 latter more coarsely punctate, and with a number of coarse, scattered punc- 

 tures intervening. Abdomen at base slightly narrower than elytra, smooth. 

 Length 6.5-8.5 mm. 



Southern half of State; frequent. June 11 -November 4. 



8S9 (2693). Oxypoeus vittatus Grav., Mon. Col. Micr., 1806, 195. 



Oblong, robust. Black or piceous, shining; elytra dull clay yellow, the 

 suture and a stripe on sides, gradually widening from humerus to apex, 

 black ; legs and base of antennae reddish-yellow. Head slightly wider than 

 thorax, the base very finely and sparsely punctate. Thorax one-half wider 

 than long, sides strongly curved, the base much narrower than apex, disk 

 smooth. Elytra one-third wider and distinctly longer than thorax, with a 

 sutural and two discal rows of rather fine punctures and a number of 

 coarser scattered ones. Abdomen as wide as elytra, smooth, the tip of the 

 last segment pale. Length 5.5-6 mm. 



Lake and Vigo counties; frequent. July 2-October 9. Occurs 

 especially in clumps of overlapping fungi at base of stumps. 



0. fasciatus Melsh. and 0. bicolor Fauv., are in all probability 

 only color varieties of vittatus. I have included them in the key, 

 that the variation may be noted, though authentic specimens of 

 neither are in the collection at hand. 



