422 FAMILY XI. STAPHYLINID.-E. 



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

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



Group F. LATHROTAXIS. 



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. LTNOLATHRA. 



ee. First join) of hind tarsi distinctly shorter than second. 



Ji. I.ody large, stout, parallel; length or more mm.; gular sutures 

 less separated, nearest together at base of head. 



Group II. EULATHROBIUM. 



////. r.udy slender, less than <> mm.: gular sutures widely separated. 



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

 /. Elytra lunger and widei- than thorax; head small and, in our 

 species, dark: body more or less fusiform. 



Group I. LATHROBIKLLA. 



//. Elytra small, shorter than Ihorax; head larger, as wide as ely- 

 tra and pale in color; bndy parallel. 



Group J. MICROI.ATIIKA. 



GROUP A. (APTEKALIUM.) 



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

 Indiana. 



808 (2521). LATHROBIVM BREVIPEXXK Lee.. X. Sp. X. Am. Col.. I. 1803. 44. 

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

 and antenna? 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. Antennre 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; raiv. March 2f>. Known heretofore from 

 Illinois. Iowa and Missouri. 



GROUP B. (LATHROBIVM.) 



TJathei- 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: 



KKV TO INDIA.NA Sl'KI IKS OK <;I!OIP I!. 



a. r.icolored ; black, antenna', legs and elytra wholly reddish-brown ; length 

 less than ."> mm. : fifth ventral of male with a round discal impression, 

 sixth deeply notched at tip. BICOLOR. 



