72 
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~s 
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39. 
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8. 
© 
Trans. Acad. Sci. of St. Louis 
EXPLANATION OF PLATE 
Pirate XXIV 
The entrance to the nest of Cerceris bicornuta. 
The burrow of Bembix nubilipennis, enlarged by Cerceris 
bicornuta. 
Pseudagenia mellipes. 
The wall removed from nests of Sceliphron Se to 
ea (arrows) the nests of Pseudagenia mellip 
Interior arrangement of ray of Pseudagenia mellipsa in nest 
of Sceliphron caementari 
