388 Trans. Acad. Sci. of St. Louis 
CHAPTER V. 
Wasps oF THE Genus OpyNERUS AND THEIR NESTING 
Hapsirts. 
Odynerus (Stenodynerus) conformis Sauss. 
[S.'A. Rohwer]. 
One might logically expect to find, in the emergence of 
twig dwellers, that the first egg deposited would be the 
first to give forth its mature adult. Of all the possible 
orders of emergence, we find three kinds actually occur- 
ring in various species. 
1. The first egg deposited is the first to mature, and 
the insect quietly stays in its cell at the bottom of the 
tunnel and waits for the others to become adult and clear 
the way to give it free egress. 
2. The insect from the first egg deposited is the first to 
emerge from the pupal case, and the new adult does not 
wait for the younger ones above to go before, but breaks 
into the successive cells and through the numerous par- 
titions, kicking back behind it both debris and brothers 
alike in its rush for freedom. This pioneer of course 
clears the way and makes emergence quite easy for the 
followers. 
3. A more specialized order of development is that in 
which the larva nearest the opening is the first to arrive 
at maturity and emerge, the one below following it, and 
80 on, so that each has only to break through the one roof 
over its own cell—provided, of course, that the emergence 
of the brothers above has been successful. 
When one thinks of the order of development of the 
young of Ceratina,* where the oldest egg deposited pro- 
*An account of the life history +8 easing calcarata is to be pub- 
lished soon in Annals Ent. Soc. Amer 
