6 U.S. NATIONAL IMUSEUM BULLETIN 2 68 



33. Scape broad and flattened; denticles on the posterior apical angles of the first 



five segments of the flagellum (southern Arizona, southwestern New 



Mexico, Sonora and Baja California, Mexico) angulata Rohwer 



Antennae normal in form 34 



34. Enclosure ridged; dark vittae of face extending to the free border of the 



clypeus 35 



Enclosure pitted; lower face without dark vittae 36 



35. Fore and mid femora with oval creamy white patches (north central 



Mexico) baccharidis, new species 



Femora usually immaculate (arid sections W. of Rocky Mountains) 



vittatifrons Cresson 



36. Thorax and first two abdominal segments immaculate; mandibles normal 



(southern Mexico, states of Puebla and Oaxaca) . , stangei, new species 



Thorax and first two abdominal segments with yellow markings; mandibles 



unusually broad (Rocky Mountains, Montana south to central Mexico) 



montana Cresson 



FEMALES 



1. Second submarginal cell not petiolate 2 



Second submarginal cell petiolate 8 



2. Without a distinct projection or extension of the ventral clypeal margin or 



surface, except for a slight medial carina; ferruginous with yellow 



markings 3 



With a conspicuous projection or extension of the ventral clypeal margin or 

 surface 4 



3. Abdominal terga with broad yellow bands showing little or no emargination 



(southern Arizona, southern New Mexico, western Texas and north central 



Mexico) lacunosa lacunosa Scullen 



Abdominal terga with distinctly emarginate bands of yellow (southern 

 Arizona, southern Texas, Coahuila, Mexico) 



lacunosa sabinasae, new subspecies 



4. Clypeal surface with an emarginate projection on the surface of which are two 



subparallel carinae; brown with sclerite borders and some depressed areas 

 black (known only from the states of Hidalgo, Michoacan and Jalisco, 



Mexico) brunnea Scullen 



Ventral clypeal border with a rounded medial extension 5 



5. Mandibular denticles acute; with a large amount of fulvous to ferruginous 



coloring (western to southwestern Mexico from Sonora to Oaxaca) 



velutina Scullen 

 Mandibular denticles rounded; black with yellow markings only .... 6 



6. Length about 23 mm. (only one specimen from Panama, Central America) 



violaceipennis Scullen 

 Length about 15 mm 7 



7. Two lateral large yellow spots on the scutellum; enclosure black except for 



two elongate yellow spots; tergal bands much reduced (one specimen only 

 from Temax, north Yucatan, Mexico) punctifrons punctifrons (Cameron) 

 Emarginate band on the scutellum; entire enclosure yellow; solid but narrow 

 bands on all terga (one specimen from El Salvador) 



punctifrons cavagnaroi, new subspecies 



8. Distinct projections or elevations on the surfaces of the lateral clypeal 



lobes 9 



All projections, elevations, or processes confined to the medial clypeal 

 lobe and/or margins of the lateral lobes 11 



