Field Studies of the Non-Social Wasps 337 
that I have found little else to record concerning them. 
They neither loiter nor dance, fraternize nor fight. Only 
a few times during the summer were they seen feeding 
quietly on the flowers of buckbrush and goldenrod near 
their nests. 
The wasps continued to work the old burrows until 
late in the summer, but no new ones appeared during the 
latter part of the season. They continued to push up dirt 
and carry in prey; hence I surmised that they were ex- 
tending the burrows and putting in additional pockets. 
During the week of September 12-18 they disappeared ; 
the earth over their holes was soon beaten down by rain 
and traffic. The place and manner of their death was not 
learned. 
A number of other species were seen prowling about 
the premises of Cerceris’ home. Their purposes or meth- 
ods of approach were not actually ascertained, but we 
know the character of some of them well enough to feel 
justified in holding our suspicions. A Parametopia sp. 
entered one hole and was captured as it emerged. In 
early August many Hedychrum violaceum Brulle [S. A. 
Rohwer] (fig. 34) were seen entering the burrows, and 
in two instances Lyroda sublita Say [S. A. Rohwer] in- 
truded. A Megachile was also seen hovering about the 
burrows of Cerceris, but I could not catch her in any mis- 
demeanor. Several specimens of the Dipteron, Exopro- 
Sopa fasciata Macq. [C. T. Greene] were taken as they 
persistently hovered above the Cerceris burrow at Jer- 
Seydale, 
Tue Bu-sue Huntress, Cerceris bicornuta Gurrty 
[S. A. Rohwer]. 
Cerceris bicornuta, like C. raui, digs holes in the earth 
and uses bill-bug beetles for food. The various species 
