Trans. Acad. Sci. of St. Lowis 
EXPLANATION OF PLATE 
Pirate XXI 
Fig. 20, 4 portion of the face of the clay bank, showing turrets 
(E) Entechnia faurea, and (U) Anthophora abrupta. (Thi 
shows the relative size of the turrets of the two species. 
tu is horizontally made CE)' of penne taurea. (S) 
Pig. 21; he 
Pe upturned turrets of Anthophora ra 
Fig. 22. Three years later; the same area as Fi ig 3; the nests of “st 
abrupta are gradua ally spreading southward as the sunlig 
shaded _ portions. 
reaches the previously 
