NORTH AMERICAN HYMENOPTEKA. 191 



Head very large, nearly twice broader than thorax, with two large 



spines beneath, behind mandibles Robiiisouii. 



Head very large, twice as broad as thorax; siecoud abdominal segment 

 with au ovate spot of deep golden pubescence on the disc. 



quatiridens. 

 Head large, a little wider than thorax; cheeks with an acute s\nnv 



beneath capitata. 



Head subquadrate, as wide as thorax, with two ovate spots of golden 

 pubescence ; metathorax with two lateral stripes of golden 

 pubescence, and two similar spots on the second segment of 



abdomen, black entirely Cirabbii. 



Black ; head, and a transverse band on the thorax, with bright gol- 

 den pubescence ; second abdominal segment ferruginous, with 

 a large, subovate patch of black pubescence at its base ; fourth, 

 fifth and sixth segments with golden pubescence above. 



ducalis. 

 Head wider than thorax, subquadrate, with coarse, golden pubescence. 



leda. 

 Posterior angles of head carinate, ending beneath in a short spine. 

 Head ferruginous, with golden pubescence on vertex ; second abdomi- 

 nal segment with two pale yellowish spots lertiia. 



Ferruginous ; head and thorax with golden pubescence ; second abdomi- 

 nal segment with two large testaceous maculje..coinbusta. 

 Head entirely ferruginous, shining; second abdominal segment with 

 two large ferruginous spots, occupying nearly the whole seg- 

 ment above caiiadeiii^is. 



Ferruginous; head wider than thorax, basal margin of second abdomi- 

 nal segment at middle with bright golden pubescence and two 

 ovate spots of same color near its apical margin. .blaiidiiia. 

 Posterior angles of head carinate, unarmed beneath. 

 Second abdominal segment above yellowish, a large spot on basal middle, a 

 dot on each side and broad apical margin, narrowed laterally, 

 black ; bead and thorax black, with golden pubescence. 



bisigiiata. 



Black; vertex and ]n-othorax with bright rufo-fulvous pubescence; 



second abdominal segment with two ovate spots and its apical 



margin with bright yellowish pubescence araiieoides. 



Second abdominal .segment above ferruginous, with a large black spot at l)ase 

 and another at apex ; head with dense golden pubescence. 



couiiecteii!s>. 

 Second abdominal segment above ferruginous, with three spots at base (mid- 

 dle one largest) and broad apical margin fuscous ; head with 



dense ochraceous pubescence eoiituniax. 



Second abdominal segment above golden yellow, with three black spots, 

 middle one large and longitudinal ; head ferruginous, occiput 



black gothica. 



Second abdominal segment above silvery, with three black spots towards 

 base, middle one large and longitudinal ; head ferruginous, 

 occiput with two black spots izucar. 



