AMERICAN HYMENOPTERA. 241 



3. Pubescence black prima Casad. 



Pubescence gray or fulvous 1. 



4. Wings clear or only faintly clouded 5. 



Wings rather strongly clouded apioally 10. 



5. Enclosure of inetathorax bounded by a salient rim, the surface more or less 



strongly longitudinally ridged 6. 



Enclosure indistinctly marked, the surface rather finely granular 7. 



6. Abdomen red, except sides of 1st and 2nd segments — both sexes. 



sphecotlina Casad. & Ckll. 

 Abdomen of female with the apical margins of the segments and apical seg- 

 ments more or less black, that of male black, save occasionally with 

 indications of red on the ventral surface of 1 and 2 ■ ■ ■ - JI stria* Rob. 



7. Head and thorax black, or varied with yellow, finely granular. Insects 



large or of moderate size 8, 



Head and thorax with bluish and greenish reflections. Insects rather small. 



iIIiiioicii*is form tricolor Rob. 



8. Insects of moderate size (about 10 mm.) 9. 



Insects rather large (12 mm. or over) 10. 



9. Abdomen of female red, sometimes with base of apical segments broadly 



black and with their apices testaceous; the males similar, but fre- 

 quently entirely black. Wings hyaline, apical margins faintly clouded. 



erythrogastra Ashm. 



Abdomen of female with base of all segments broadly black. Wings with a 



strong reddish yellow tinge rhodura Ckll. 



10. Clypeus dark in both sexes 11. 



Clypeus not dark, at least in the % ■ . ■ ■ 12 



11. First segment of abdomen very feebly and sparsely punctured. 



Jessiese Ckll. 

 First segment of abdomen strongly punctured argemoii is Ckll. 



12. Dorsum of thorax honey-yellow mellea Crrss. 



Thorax entirely black 13. 



13. Pubescence on head and thorax pale yellow or fulvous 14. 



Pubescence on head and thorax dull white 15. 



14. Pubescence fulvous; basal joints of antennse more or less strongly ferrugi- 



nous pr it ii or ii in Ckll. 



Pubescence pale yellowish ; antenna? entirely dark. 



prunorum sub. sp. Gillette! Ckll. 



15. Second segment of abdomen provided with a black band. . . 4';is;nl;r Ckll. 

 Second segment of abdomen with only a black spot on each side. 



pascoensis Ckll. 

 If). With the light color orange aud confined to the apex and base of segments. 



aureociiicta Ckll. 



The light color reddish or yellowish testaceous 17 



17. Larger (13.5 mm.), the pubescence rather long and copious, yellowish. Apex 

 of segments yellowish testaceous. Venter honey yellow. 



nielli veil tris Cress. 



Smaller (8.5 mm.), the pubescence scant, pale. Apex of segments broadly 



reddish. Fimbria pale lineata Prov. 



TRANS. AM. ENT. SOC, XXIX. (31) AUGUST. 1903 



