232 long's second expedition. 



Length less than two-fifths of an inch. 

 2. P. politus. [Ante, p. 113.] 



<CEBCEBJS Latr. 



C. deserta. — Black ; hypostonia, feet, and bands of the ter- 

 gum, yellow. [344] 



Inhabits North-west Territory, Missouri, and Pennsylvania. 



% Hypostoma entirely yellow ; antennae yellow before, dark 

 brown behind ; collar with two transverse yellow spots ; scutel 

 with a transverse line, yellow ; wings hyaline, brownish on the 

 costal margin near the tip ; feet yellow ; anterior thighs black on 

 the posterior middle, intermediate thighs on the posterior base 

 and posterior thighs at tip, black; tergum, first joint rounded 

 with a spot each side ; second and third segments with each a 

 band on the posterior margins slightly and widely emarginate 

 before, remaining segments with each a narrower band on their 

 posterior margins, yellow; venter, three or four first segments 

 with each a lateral, triangular, yellow spot. 



Length more than two-fifths of an inch. 



Var. a. metathorax with a yellow, oblique line each side be- 

 hind; first joint of the tergum immaculate. 



Var. P- metathorax and first joint of the tergum immaculate ; 

 bands of the tergum excepting the first, very narrow, linear ; 

 ventral spots obsolete ; feet with a larger proportion of the black 

 color. 



Var. y. a small yellow spot each side before the tip of the 

 scutellar line. 



EUMENES Latr. 



1. E. eraterna. — Black ; hypostoma, anterior thoracic mar- 

 gin, scutellar line, posterior submargins of the segments of the 

 tergum, and two spots on the second segment, yellow. 



Inhabits United States. 



Body polished, punctured ; hypostoma emarginate, and with a 

 line between the antenna?, pale yellow ; antennae, [345] basal 

 joint with a whitish line before; thorax with the anterior mar- 

 gin somewhat contracted in the middle, yellow ; scutel yellow ; 

 wings fuliginous; thighs black, yellowish at the knee joint; tibiae 

 whitish, a black line near the tip ; tarsi pale yellowish, dusky 

 towards the tip; tergum, first segment with a subbidentate yel- 



