AMERICAN HYMENOPTERA. 137 



Postpetiole with white spot or band at tip. 



Metathorax immaculate 56. iiiiifa«4<>iatoria9. 



Metathorax with two white spots behind 5.". siiUIsiliiM, var. 



Apex of abdomen marked with white.. Ambly. improvisus. 



Antennte entirely black. 

 Postpetiole entirely black. 



Scutellum entirely black Ij. iiiaoiloiif lis. 



Scutellura pale. 

 Apex of abdomen black. 

 Metathorax immaculate. 

 Posterior tibife white or yellow, black at tips. 



Wings fuscous 5S. Broiifeiis. 



"Wings subhyaline. 



Posterior tarsi whitish; all the coxse black 59. aiKlax. 



Posterior tarsi white, annulate with blat^k; four anterior coxas 



white 60. ciiicf ilai'Ki*^. 



Posterior tarsi entirely black, all the coxse white... Ambly. ultus. 

 Posterior tibiae black, with white line above. 



Face entirely black Ambly. expunctus. 



Face white laterally, centrally black. 

 Postpetiole coarsely aciculated. 

 Abdomen black, second segment uniformly sculptured ; pos- 

 terior coxse marked with white Ambly. ultus, var. 



Abdomen blue-black, second segment coarsely and longitudi- 

 nally rugose on basal middle; posterior coxae entirely 



black Ambly. stadaconensis. 



Postpetiole smooth or punctured. 



Sides of face narrowly white 51. COrdatas. 



Sides of face broadly white. 

 White line on posterior tibise entire. 



Wings smoky, sometimes clear at base. ..49. viltirrous. 



Wings hyaline, narrowly dusky at tips 50. recens. 



White line on posterior tibife not reaching the tip; wings 



hyaline 34. siibcyaneiis. 



Face entirely white; wings hyaline 52. jejunilS. 



Metathorax with two white spots behind 53. s<«iil»latus. 



Apex of abdomen fulvous, venter and narrow lateral margins of dorsal 



segments yellowish 63. Ten trails. 



Postpetiole with white spot or band at tip. 



Scutellum white only on lateral margins; abdomen blue. ..23. CDCrillciIS. 

 Scutellum white; abdomen black. 



Metathorax immaculate 54. Azotus. 



Metathorax with lateral white spot 55. infidclis. 



Posterior legs black, their coxfe, femora and tibise marked with white. 



Scutellum white only on lateral margins; abdomen blue; metathorax marked 



with white 24. piiloltcr. 



Scutellum white; abdomen black; metathorax immaculate. ..61. oruatipcs. 

 Posterior legs ferruginous. 



Posterior coxse ferruginous, tips of their femora, tibiae and tarsi entirely 

 black; form slender. 



Face pale 68. itiierilis. 



Face black Ambly. illaetabilis. 



TBANS. AMEn. ENT. SOC. VI. (19) JULY, 1877. 



