424: 



FAMILY XI. STAPHYLINJDiE. 



Laporte County ; rare. July 25. Described from New York, 

 Ontario and Illinois. 



*S1Q (2522). Lathrobium armatum Say. Trans. Amer. Phil. Soc, IV, 1834, 

 453 ; ibid. II, 56S. 



Elongate, rather robust. Black or piceous, feebly shining; palpi, an- 

 tennae and legs reddish-brown. Head as wide as elytra, its sides rounded 

 into base; surface finely and sparsely punctate. Thorax oblong, nearly 

 equal in width to head and elytra; surface, as well as that of elytra, 

 coarsely, evenly and sparsely punctate ; the median smooth line very nar- 

 row. Abdomen as wide as elytra, parallel, finely and rather closely but 

 not densely punctate. Length 8-10 mm. 



Southern half of State, frequent ; less so in the northern coun- 

 ties. February 14-Sept ember 22. Occurs especially in low, damp 

 sandy places ; taken also at sap of soft maple. 



811 (2524). Lathrobium simile. Lee, N. Sp. N. Am. Col., I, 1863, 43. 

 Elongate, rather slender. Black, shining ; elytra and abdomen piceous ; 



antenna? and tip of abdomen reddish-brown ; legs paler. Head subquadrate, 

 sparsely and finely punctate. Thorax oblong, as wide or slightly wider than 

 head, scarcely longer than wide, rather coarsely and sparsely punctate. 

 Elytra as long and slightly wider than thorax. Abdomen as wide as elytra, 

 minutely and very densely punctate. Fifth ventral of male narrowly and 

 deeply impressed along the middle; sixth also with a lengthwise groove 

 and a wide, deep notch at apex. Length 7.5-9 mm. 



Vigo and Marion counties ; scarce. February 14-Oetober 4. 



812 ( ). Lathrobium ixsanus sp. nov. 



Elongate, slender. Dark reddish-brown: elytra tinged with red; legs 

 and antenme paler. Head subquadrate. narrowed in front, its surface, as 

 well as that of thorax, closely and rather coarsely punctate. Antenme 

 slender, the outer joints obconical, as wide at apex as long. Thorax longer 

 than wide, its sides straight, feebly converging from apex to base. Elytra 

 as long as thorax, finely and much more sparsely punctate than there. 

 Abdomen finely and densely punctate. Notch of last ventral of male dis- 

 tinctly wider and less deep than in simile. Length S.5 mm. 



Laporte County; rare. July 25. 



L. crural is Casey was described from New Jersey, Ohio and 

 Iowa. L. concolor Lee. is said by Casey to occur in "Indiana and 

 Avestward. ' ' 



Group C. ( Lathrobioma. ) 



This group is composed of rather small, slender species which 

 resemble those of Group B. in their large head and thick, bead-like 

 antenme. but the joints of the hind tarsi are subequal. Casey has 

 placed in the group 11 species, two of which may occur in the State, 

 though neither is in the collection at hand. They are: 



