The Ecology of a Sheltered Clay Bank 211 
Stlaon sp. (S. A. Rohwer) one was nervously walking 
about the clay bank on July 30, 
Sphea (Ammophila) nigricans Dahl. [S. A. Rohwer]. 
This was seen walking about the clay bank, August 14, 
1917, evidently seeking a place for a nest. Since her 
prey is Lepidopterous larvae, we cannot accuse her of 
having come to the bank for prey. 
Sphea (Ammophila) procera Klug. [S. A. Rohwer]. 
On August 16 this large wasp was seen burying a large 
caterpillar of the Noctuidae [S. B. Fracker]. Since she 
left her young ‘‘on the door step’’ of the bank, she should 
be regarded as an inhabitant or a pioneer; but since I 
took possession of both, she was thus reduced to a visitor. 
Odynerus (Stenancistrocerus) unifasciatus Say. [S. 
A. Rohwer]. This Eumenid was seen moistening a spot 
on the bank with water and biting out and carrying away 
the mud, June 28, 1920. 
Polistes variatus was foraging on the rose bush in 
front of the bank on May 28, 1920. There was hardly 
any connection or rather only a far fetched one, in the 
relations to the inhabitants of the bank, in that the P. 
variatus would probably carry off caterpillars which, in 
the natural course of events would have become food for 
the inhabitants. 
Hoplisus (Pseudoplisus) phaleratus Say. [S. A. Roh- 
wer]. This species, seen entering a crevice on July 21, 
1920, was distinctly new to the bank. 
Trypoxylon nigrellum Roh. [S. ‘A. Rohwer]. One was 
seen foraging for spiders in the old bee tunnels of the 
clay bank on September 6, 1917. 
Miscophus americanus [S. A. Rohwer]. Two females 
taken from the bank on August 31, 1918, were probably 
seeking a nesting site. 
