APPENDIX, 339 



ated ; wings hyaline, nervures fuscous ; pleura with a 

 small dot before the wing ; feet black ; tibise sericeous, 

 white on the exterior base; tarsi white; tergum, second 

 segment at tip each side with a small white spot. 



Length three-tenths of an inch. 



This species corresponds in its generic characters pre- 

 cisely with Arpactus, Jurine, and of course possesses 

 those oblique parallel lines of the metathorax which Jurine 

 mentions as distinguishing this genus. 



PEMPHREDON, Latr. Fabr. 



1. P. concolor. Black, minutely punctured; metathorax 

 with dilated punctures; abdomen glabrous. 



Inhabits North-west Territory, 



Head with minute pubescence, more distinct on the front; 

 mandibles obtusely bifid at tip, immediately above which 

 are two obtuse teeth ; punctures minute, sparse on the ver- 

 tex ; thorax with a slightly impressed, longitudinal line, 

 from which proceed numerous, minute wrinkles, curving 

 outwards and backwards ; punctures larger than those of 

 the head; wings slightly fuliginous, nervures blackish; 

 metathorax with dilated punctures, or slightly impressed 

 cavities ; feet somewhat sericeous ; abdomen polished, im- 

 punctured ; petiole moderate. 



Length of the body nearly seven-twentieths of an inch. 



This is allied to P. unicolor, Fabr. 



2. P. inornatiis. Black, immaculate, punctured ; abdo- 

 men impunctured, polished ; petiole nearly one-third the 

 length of the abdomen. 



Inhabits Pennsylvania. 



Wings hyaline, very slightly tinged with dusky, the 



