52 PKOCEEDINGS OF THE NATIONAL MUSEUM vol.75 



77. Fasciae on all tergites interrupted 78. 



Fasciae on tergites, some or all, continuous 80. 



78. Sixth and seventh tergites maculated 79. 



Sixth and seventh tergites not maculated inops. 



79. Scutum with broken U-shaped yellow discal mark; fasciae on tergites 



yellow frioensis. 



Scutum, at most, bearing small white discal lines; fasciae on tergites 

 white multipicta. 



80. Fasciae on tergites white with a trace of yellow on anterior margin ; 



sternites 2-5 with broad, bright yellow fasciae almost completely cover- 



jn<r them flavolatera. 



Combination of fasciae on tergites and sternites as given above not pres- 

 ent 81. 



81. Metanotum black; fasciae on tergites creamy white 82. 



Metauotum maculated; fasciae on tergites yellow 83. 



82. Fasciae on tergites continuous agrestis. 



Fascia on first tergite (and usually those on third and fourth) inter- 

 rupted texana. 



83. Front wing slightly infumated, most evident along the borders of the 



veins melanaspis. 



Front wing hyaline 84. 



84. Scutum usually with pair of discal marks; dorsum of propodeum with 



curved yellow fascia troglodytes. 



Scutum without discal marks ; dorsum of propodeum black 85. 



85. Process on second sternite prominent ; lateral spots on second sternite 



connected helianthopolis. 



Process on second sternite reduced, carinate in form ; lateral spots on 

 second sternite not connected bahiae. 



86. Antennae and frons (except spot surrounding anterior ocellus) ferruginous 

 - or yellow suffused with ferruginous ; tergites 1-5 with conspicuous 



maculations ; length 22-25 mm 87. 



Combination of characters as given above not present 88. 



87. Scutellum, metanotum, and propodeum each bearing a fascia diversipennis. 



Scutellum, metanotum, and propodeum immaculate refuscata. 



88. Neither metanotum nor dorsum or posterior surface of propodeum (exclud- 



ing lateral angles) maculated 89. 



Metanotum or dorsum of propodeum or its posterior surface, any or all 

 of these maculated 116. 



89. Fasciae on all tergites interrupted medially (in some cases reduced to 



lateral spots or wholly lacking) 90. 



Some or all of the fasciae on tergites continuous 103. 



90. Ultimate tergite strongly wrinkled belfragei. 



Ultimate tergite not wrinkled, punctate (or rugose, in which case the 



labrum is abnormally long) 91. 



91. Clypeus heavily marked with black 92. 



Clypeus not marked with black 96. 



92. Wings clear ; length 15 mm. or less 93. 



Wings somewhat infumated ; length greater than 15 mm 95. 



93. Scape black ; maculations of first and fifth tergites reduced to small widely 



separated lateral spots madecassa. 



Scape maculated below ; maculations of first and fifth tergites interrupted 

 fasciae , 94^ 



