422 



FAMILY XI. STAPHYLINIDiE. 



g. Form larger, more robust, length 6 or more mm. ; neck broad, 

 more than half as wide as head ; elytral punctures in rows. 



Group F. Lathbotaxis. 

 gg. Form small, slender, length less than 5 mm. ; neck distinctly less 

 than half as wide as head ; elytral punctures coarse and sparse, 

 arranged in rows. Group G. Linolathra. 



ee. First joint of hind tarsi distinctly shorter than second. 



h. Body large, stout, parallel; length 9 or more mm.; gular sutures 

 less separated, nearest together at base of head. 



Group H. Eulathrobium. 

 hh. Body slender, less than 6 mm.; gular sutures widely separated, 

 nearest together in front, farthest apart at base of head. 



i. Elytra longer and wider than thorax ; head small and, in our 



species, dark ; body more or less fusiform. 



Group I. Lathrobiella. 



ii. Elytra small, shorter than thorax ; head larger, as wide as ely- 



tra and pale in color ; body parallel. 



GrOUP J. MlCROLATHRA. 



Group A. ( After alium.) 



To this group Casey ascribes two species, one of which occurs in 

 Indiana. 



808 (2521). Lathrobium brevipenne Lee. N. Sp. N. Am. Col., I, 3863', 44. 



Elongate, rather slender. Dark reddish-brown to piceous. shining ; legs 

 and antennas reddish-brown. Head as wide or slightly wider than thorax, 

 sides parallel, base truncate, hind angles rounded; surface coarsely and 

 rather closely punctate behind the eyes, smooth at middle. Antennas very 

 stout, the joints obconical, the basal joint robust. Thorax oblong, one- 

 fifth longer than wide, sparsely and coarsely punctured, with a broad me- 

 dian smooth space. Elytra but slightly more than half the length of thorax, 

 rather coarsely and sparsely punctate. Abdomen as wide as elytra. Length 

 7.8-9 mm. 



Putnam County; rare, March 25. Known heretofore from 

 Illinois, Iowa and Missouri. 



Group B. (Lathrobium.) 



Rather stout, usually large or medium-sized species, having the 

 thorax uniformly punctured, with distinct smooth dorsal line ; elytra 

 without a fold or raised line on side ; basal joint of hind tarsi dis- 

 tinctly shorter than second. The following species have been taken 

 or probably" occur in the State : 



KEY TO INDIANA SPECIES OF GROUP B. 



a. Bicolored; black, antennae, legs and elytra wholly reddish-brown; length 

 less than 5 mm. ; fifth ventral of male with a round discal impression, 

 sixth deeply notched at tip. bicolor. 



