Field Studies of the Non-Social Wasps 359 
the secret of kneading its material with saliva, so its pots 
have not the proper permanency, and for this reason 
they are not placed in exposed situations. (Step, Mar- 
vels of Insect Life, p. 426; Sharp, Insects, Pt. 2, pp. 
105-106.) 
Pseudagenia adjuncta makes tiny mud cells in the old 
cocoons left in the nests of Trypoxylon politum, and it 
also plasters larger mud cells to the same nests. (Rau, 
Journ. Anim. Behay., 6; 42, fig. 21, 23.) 
Agenia subcorticalis builds nests in old Pelopoeus 
cells, taking the dirt from the walls of the nests in which 
She is building, moistening the dirt with water as she 
works. (Hartman, Bull. Univ. Texas, 6 : 51.) 
Pseudagenia blanda builds stout cells of mud, cylin- 
drical and thick walls, ranged alongside each other, 
Sometimes as many as four cells in a nest; they are 
placed in the fissure of a vine or at the base of a tree. 
(Williams, loc. cit., p. 97.) 
Pseudagenia makilingi makes a two-celled mud nest 
which is hidden in a curled-up leaf. (Williams, loc. cit., 
p. 97.) 
Agenia bombycina makes clusters of little mud cells 
% crevices. (Peckham, Wasps Social and Solitary, p. 
4.) 
Pseudagenia architecta makes twin cells of mud. (Rau, 
Wasp Studies Afield, p. 84.) These nests are probably 
smilar to those described by the Peckhams (Wise. Geol. 
& Nat. Hist. Surv., 2; 165-166), but they do not men- 
tion any attachment of the cells in pairs. Ashmead 
(Psyche 7; 66. 1896) records that the nests are thimble- 
Shaped, and are found under bark, logs and rocks. This 
brief description by Ashmead is applied also to three 
other species, A. bombycina, A. corticalis and A. mellipes. 
