The Ecology of a Sheltered Clay Bank 237 
by name, living at the expense of bees of the genus 
Anthophora. ‘‘The eggs of Sitaris are deposited in the 
earth in close proximity to the entrances of the bees’ 
a ar a single female producing upwards of two 
thousand eggs. ..... They hatch in about a month, 
producing a tiny triungulin of black color; the larvae, 
however, do not move away, but, without taking any 
food, hibernate in a heap until spring, when they be- 
come active. Although they are close to the abodes of 
the bees, they do not enter them, but attach themselves 
to any hairy object that may come near them, and thus 
get onto the bodies of Anthophora and are carried to the 
nest.’’? At first it seemed strange that at the clay bank 
at Wickes they were present only in such small num- 
bers, but this is explained by the statement from the 
Same work that the triungulins distribute themselves 
on all sorts of unsuitable insects, so that it is possible 
that not more than one in a thousand succeeds in gain- 
ing access to the Anthophora nests. 
Résumé of Parasites. 
To summarize this group, I have found in the clay 
bank parasites to the number of 19 species. This 
is highly interesting in the light of the relation of 
this number to the number of pioneers and renters. 
Of the first there were 18 species, many of which could 
not possibly be host of these parasites; of the latter 
there were 11 species, including spiders and others which 
likewise could not serve as host. Leaving out of consid- 
eration all the non-host species of both the pioneers and 
the renters, we find the parasites greatly outnumbering 
legitimate residents of either class. 
The following table recounts the parasites that visited 
the bank. 
