^02 FAMILY XT. STAPH YLTNID.^. 



KEY TO INDIANA GROl PS OF STENUS. 



(/. Abdomen strongly and distinctly margined along the sides. 



b. Fourth .ioiut of tarsi simple. Group /. 

 bb. Fourth joint of tarsi bilobed. Group //. 



aa. Abdomen not distinctly margined, faint traces of a marginal line being 

 visible only on first segment. 



c. Fourth joint of tarsi simple or but slightly enlarged. Group ///. 

 re. Fourth joint of tarsi distinctly bilobed. Group IV. 



Group I. 

 This gi-oiip. on aecoiint of its size. Casey also separated into the 

 Followinir divisions : 



KEY TO DIVISIONS OV GKOfP I. 



a. Elytra each with an orange spot near the middle of tiic disk. 



Division .1. 

 (III. Elytra without pale spot. 



b. Punctures in some portion of the elytra more or less joined or coales- 



cent, sometimes only in twos or threes, sometimes in long channels. 



c. The channels or rows of punctures in some one spot on the surface 



of each elytron arranged in a si)iral or whorl which is comiilete 



or very nearly closed. Division B. 



cc. The channels or rows of united punctures often sinuous but never 



forming a completed vortex or whorl. 



d. Thorax with a more or less distinct median channel or groove. 



Division ('. 

 dd. Thorax without trace of median groove. Division D. 



bb. Punctures of elytra all isolated and distinct one from another. 



Division E. 

 Division A. 



The species of tliis division are anions: the larcfest in the genus. 

 They are easily recognized hy the orange colored spot on each ely- 

 tron. Two species have l){>en taken in Indiana, while another 

 doubtless occurs. 



KEY TO SPECIES OF DIVISION A. 



a. Femora black ; length 4.5-5 mm. 778. bipun( tati's. 



au. Femora not black, ranging in color from dark piceous-l)rown to dull yel- 

 low, 

 ft. Head wider than elylra. spot on latter liilobed; length ,3.6-4 mm. 



779. COLON. 



• bb. Head e<pial in width lo elytra, spot rounded ; ninth and tenth joints 



of antennic (H]nal; length 3.8^.4 mm. semicolon. 



778 (2803). Sti:m s nirrN( tati s Ericlis., Col. Mnrch.. is:t7, 530. 



Rather robust. I'.lack. feebly bronzed, shining, very finely and sparsely 

 pubescent; elytra eacii with a small, i)ale, rounded spot just behind the 

 middle. Head less than twice as wide as long, deeply excavated and finely 

 punctured between the eyes; anteume reaching middle of thorax, the third 



