INHABITING NORTH AMERICA. 8S 



solete, undulated bands behind the middle, the posterior 



one less deliiiite. 

 Feet whitish-testaceous. 

 Found in Missouri by Mr. Nuttall. 



5. B. *co?itrncfu7n blackish-brown, thorax nuich contiactcd 

 behind, Irnsc iuudly hroudcr than tiie peduncle, rectilinear. 



Lengtli one-lifth of an inch. 



Head iilack ; untenmv brown, base rufous ; lahnirn deep pi- 

 ceous ; mandibles piccous before the tip : palpi piccous- 

 black. 



Thorax black, slightly cupreous, widest rather before the 

 middle, nuich contracted behind, lateral groove not di- 

 lated, posterior angles very small, base, excepting the an- 

 gles, hardly wider than the peduncle, basal line rectilinear. 



Elytra blackish, or dark piceous slightly glossed with cu- 

 preous, witli a very indistinct paler posterior margin and 

 tip, stria' impressed, obsolete at tip, lateral ones shortest, 

 punctures very distinct, approximated, interstitial lines 

 flat, third with a puncture before and one behind the 

 middle. 



Feet testaceous. 



The |)ale hind margin and tip are usually obsolete, and 



often almost imperceptible; it varies in extending to the base, 



but is ordinal ily in the form of a very indistinct, sul)tcrminal. 



marginal spot, and an apicial larger one. 



6. B. *niger purple-black; elytra bronzed, stria' obtuse, ob- 

 solete at tip: feet rufous. 



Length more than tlnee-twentieths of an inch. 



Tachya niger. MeUh. Catal. 



Bodji beneath piccous-lilack. 



Head blaekish tinted with pin-plc ; anteruifr fuscous; base 



and palpi rufous. 

 Thorax black, slightly purpurescent, broadest rather before 



