91 
be found that some lack these silken sheets; these are the newer 
cells, still unoccupied or containing an egg or a larva. Others 
containing an egg or larva already have this sheet. We find, 
then, that the wasp economizes in using a cell over again, as do 
social wasps. 

Fig. 42. Ventral view of 
pupa of MW. violacea, X 
»/”) 
9/¢ 
o/s. 

Fig. 41. M. viola- 
cea cell in verti- 
cal section show- 
ing cocoon with- 
in. About. nat- 
ural size. 
The pupa (Fig. 42) is, in the female, about 23 mm. long, large- 
headed and long-limbed. At first it is whitish, but soon darkens 
with age. The 1 upper portion of the body bears several processes 
and spines. The abdomen has four forked puplecetes on each 
side, and a fifth unbranched one. The tarsi are swollen at their 
tips, and the tibial spines prominent. 
On January 29, a. m., I saw female Macromeris emerge from 
her cocoon; she took about thirty minutes to bite and force her 
way out of it. A copious brown juice which she exuded from 
her mouth softened the silk at the broader end of the cocoon and 
thus aided her efforts. Finally an irregular hole was formed 
and, struggling actively, she parted the last resisting strands. 
Macromeris came out with wings fully developed though some- 
what bent down at their tips. She was quite sprightly. A rough 
hole is bitten out of the cell cap by the emerging wasp. 
The life-cycle of the single Macromeris that I followed through 
was: 
December-February: Egg stage, 3 days; larval stage, 6 feed- 
