106 
Chelostoma mawillosum L. Nests are found in reeds on roofs. 
The bees first make a solid bottom of clay at the joint in the reed, 
the same as all bees and digger wasps do, who do not burrow 
themselves. The partitions are måde of clay, the nest is closed by 
two stoppers made of small stones, firmly jointed with clay, forming 
å very hard substance. 
Sapyga similis deposits its eggs in cells of Osmia maritima 
Friese. The Sapyga-Larva eats the fodder of the Osmia-Larva. It 
makes a cocoon and pupeates. Imago emerges in August and leaves 
the cocoon the next June or July. i 
The fact of the larva living on the fodder in the cell of the 
bee, removes it entirely from the position in the system hitherto 
accorded to it, among the digger wasps and Mutillidæ and Scoliadæ 
all of which live on animal food. It is an axiom that from a bio- 
logical point of view the distinctive mark of the digger wasps is 
their living on animal food and of the bees their living on vege- 
"table food. Accordingly the position of Sapygids is doubtless within 
the family Apidæ. 
6. Maj 1902, 
