324 MEMOIRS ON THE COLEOPTERA 



Dorsal punctures five, rarely six, impressed and larger than in any other 

 group of the subfamily 24 



18 Antennae with the subbasal joints carinate; integuments usually pol- 

 ished and almost always metallic in coloration; head very moderate, 

 the slender palpi with the last joint fusiform and rather pointed; 

 thoracic foveae two in number, sometimes variable; elytral striae 

 generally rather fine, the scutellar long. Atlantic and Pacific re- 

 gions. [Assumed American type Per. chalcites Say (sayi Brul.)] 



Poecilus Bon. 



Antennae with the subbasal joints not carinate; integuments usually pol- 

 ished, only very seldom with metallic lustre of any kind 19 



19 Prothorax coarsely margined at the sides; body parallel and subde- 

 pressed, moderate to large in size; head large, the palpi slender, oc- 

 casionally with the fourth joint much shorter than the third, in 

 which section, also, the usually polished elytra become dull; tho- 

 racic angles sharply marked, the foveae duplex; striae moderate, gen- 

 erally feebler externally and posteriorly, the scutellar very long. 

 Atlantic regions. [Type Per. tartarica Say] Lophoglossus Lee. 



Prothorax more or less finely margined at the sides 20 



20 Thoracic foveae duplex; head well developed, with prominent eyes 

 and slender palpi; prothorax more or less constricted at base, except 

 in luctuosus; hind angles always sharply marked; elytral striation 

 somewhat as in Lophoglossns; scutellar stria usually long; hind tibiae 

 normal in the male. Atlantic regions and Europe. [Assumed 

 American type Per. ebenina Dej.] Omaseus Dej. 



Thoracic foveae single, linear, impressed; hind angles never carinate. . 21 



21 Posterior tibiae pubescent within in the male; prothorax orbicular, 

 never constricted at base, the angles obtuse, sometimes with a 

 minute acute prominence as in mutus; head only moderate in size; 

 elytral striae deep, never punctate, the scutellar long. Atlantic 

 regions. [Type Per. muta Say] Dysidius Chd. 



Posterior tibiae not more pubescent in the male 22 



22 Head moderately developed as in Dysidius; thoracic sides more or 

 less sinuate basally, the angles sharp, the fovea long; elytral striae 

 not punctate, the scutellar long. Pacific coast regions. [Type 

 Per. lustrans Lee.] Parargutor nov. 



Head notably small ; body very small in size 23 



23 Prothorax flattened and deplanate toward the broadly rounded basal 

 angles; elytral striae impunctate, the scutellar completely wanting, 

 the ocellate puncture distinct however as usual. Atlantic regions. 

 [Type Per. erythropns Dej.] Pseudargutor nov. 



Prothorax not flattened or explanate at the sides, the basal angles sharp 

 and distinct; striae punctured as a rule, impunctate in patruelis; 

 scutellar stria always well developed. Atlantic regions. [Type 

 Per. patruelis Dej.] Micromaseus nov. 



24 Body somewhat as in Parargutor, the head moderate; hind angles 

 of the prothorax well defined throughout, the foveae single, linear; 

 elytral striae more or less fine, the scutellar long; elytra frequently 

 sericeous in the female. Atlantic to Pacific regions, especially in 

 more northern parts. [Type Pt. adstrictus Esch.] Bothriopterus Chd. 



