Zo 
battle before it is overcome. A wasp hunting and subduing her 
prey is an interesting spectacle though frequently tedious to 
observe. 
It is interesting to note that some of the ponerine ants as 
Leptogenys and Lobopelta, the lowest subfamily of the Formi- 
cidae, and presumably derived from solitary wasps, have a method 
of hunting their prey—in this case small land crustaceans 
much like that employed by some of the more active terrestrial 
Fossores. In the Philippines I have seen ants of the genus 
Lobopelta, very active and nervous insects, searching beneath 
leaves, small lumps of soil, etc., in damp, shady places. Every 
now and then a crustacean would be flushed, to leap away to 
safety; eventually a less active or a cornered one would be 
pounced upon by the ant, which quickly paralyzed it by one or 
more stings on the underside of the body. The victim was then 
borne away nestward under the ant’s body. 
A single victim may prove sufficient food for a wasp grub; 
with other species a number may be required.* Rarely dead and 
dry food is furnished the grub (Microbembex). Sometimes the 
young wasp is fed from day 3 day by its parents, being given 
either entire insects (Bembex) or a chewed-up portion of cater- 
pillars (Synagris). A few wasps feed their young a honey-like 
substance (Masaridae; and perhaps Stenogaster). Many social 
wasps give their young a wide range of food. 

SLEEP OF WASPS: 
Not much is known about this interesting subject. In the 
United States, Rau and Rau (1916) have made a number of 
observations on the sleep of Hymenoptera. They found that 
some of the Sceliphronini or mud-daubers assemble in sheltered 
places for the night. Many other Sphecidae, Eumeninae, and 
some male Scoliidae pass the night on weeds. This applies more to 
the male sex. They may assume odd positions on these weeds 
which they grip with their jaws and legs or with the jaws only. 
Other wasps, mainly Fossores, occupy their nest-burrows or other 
holes for the night. The more social or specialized wasps sleep 
in or about their nests—thus we find some of the psammocharid 
mason wasps keeping watch in the shelter wherein their cells are 
situated and resting on them. Higher Eumeninae may occupy 
one of the cells of their nests (Zethus, Synagris, Zethusculus ), 
the Stenogaster or slender-bodied forest wasps most certainly 
sleep or rest on or in their nests. In the tropics however, where 
*T know of no case in the Aculeata except in many Bethylidae where more than 
one egg is laid on a victim. 
