212 Trans. Acad. Sci. of St. Louis 
Vespa germanica Fabricius. In August, 1920, one 
worker of this hornet visited the bank at short intervals 
for three whole days, and as described elsewhere, car- 
ried off each time a specimen of the Chalcid parasite, 
Monodontomerus. 
Pseudagenia architecta Say. The first and only speci- 
men of this wasp was observed on July 7, 1917, to 
enter many old burrows of the mining-bees. Its be- 
havior was very much like that of its cousin, P. mellipes 
when hunting; hence we suppose that it was foraging. 
This wasp makes tiny twin cells of mud that are some- 
what barrel-shaped. 
Megachile generosa Cress. [S. A. Rohwer]. This 
bee always returned and rested on the bank after 
{ missed capturing her on June 3, 1922, which indicates 
that her interests were probably other than being merely 
a visitor. 
Halictus pectinatus Rob. [S. A. Rohwer]. ‘A male bee 
of this species was found dead on the bank, September 
6, 1917. 
Photopsis sp. One individual was making itself at 
home on the bank. This wasp is supposed to be para- 
sitic; it had evidently found a host among the population. 
Camponotus herculeanus L. subsp. pennsylvanicus 
De G. var. ferrugineus Fab. [W. M. Wheeler]. These 
ants, many of them workers and some with large heads, 
were going about the bank, often entering burrows. They 
first appeared in 1921. 
Beetles. 
Corymbites inflatus Say. [E. A. Schwarz]. This click- 
beetle was at rest at the foot of the bank on July 16. 
This beetle, or others of its kind, arriving there would 
