100 
Pseudagenia nye mitawa, unlike the larger Macromeris and 
Paragenia, lives in solitude and deserts her exposed nests when 
they are completed; thus parasites have a good chance of carrying 
on their nefarious trade 
Pseudagenia caerulescens Williams. 
Length 9 mm.; metallic greenish blue. 
This very pretty spider wasp was observed nest-building but 
once. On August 11, 1917, I saw her erecting her little mud 
nest within the silken retreat of a jumping spider, the web being 
in a vertical crack in a bamboo stump. Psewdagenia was in the 
act of bringing in rather large helpings of mud with which she 
capped the first cell. This completed, she commenced another 
cell, building it with the base against and below the first. On 
the morning of August 12 the cell was finished. and at 9:55 a. m. 
she had already stored a spider and was ovipositing on it; in 
doing this she rested quietly for a minute or so, her abdo- 
men “partly inserted in the cell. Immediately thereafter she took 
flight, and returning with a supply of mud in her mandibles, 
commenced sealing up the cell, using the tip of her abdomen as a 
trowel. But at this point I captured the architect, well knowing 
that 1f I waited a little longer she would be gone for good. 
The two cells, which were thickest in the middle, were 10-11 
mm. long by 6.5 mm. in diameter; exteriorly they were rough 
and not artistic. Each contained a species of jumping spider 
with a long conical abdomen and large grasping legs or chelae. 
Six legs had been cut off. 
The egg, which was pearly white, was a little arched in con- 
forming with the curve of the spider’s abdomen, and a very little 
less rounded and more pointed at the tail end. It measured about 
2 mm. long by 0.6 mm. in diameter, and was transversely fast- 
ened by the head end, on the side and near the base of the spider’s 
abdomen. On August 17th, one of the wasp larvae commenced 
spinning, and on the thirty-first a male emerged from the first 
cell. In making his exit therefrom he bit a small hole through the 
clay near the end of the cell. 
Pseudagenia sp. 
Length about 8 mm. 
Unfortunately I secured no adult females of this species and 
saw but a single one engaged in nest building, and this one I 
noted was of a steel gray color with clear wings and red hind 
