2 
Psyche 
[March-June 
There was definitely no hostility between the ants and the 
guest larvae; rather the latter seemed to be treated as ant 
brood. 
Unfortunately I had to continue my journey upriver im- 
mediately and had time only to place a few of the blue larvae 
in a small vial. Strenuous travelling up several hundred 
miles of rapids and falls prevented study of the material. 
One larva pupated during the journey and July 28 an imago 
emerged. Mr. Nathan Banks has kindly determined this as 
Nadiva valida Erichs. (Chrysopidae) with the note that the 
Fig. 1. a, Larva of Nadiva valida Erichs ; b, Pupal case of same. 
species “was described from the United States but known 
also from Brazil. It belongs to a peculiar group, the body 
being broad and heavy; and the venation not as much spe- 
cialized and inconstant. Allied forms are mostly in South 
Brazil, Argentina and Bolivia.” The larva and neat cocoon 
are figured below. 
A large larva after preservation was 10.5 x 5 mm., the 
extended and dried pupal envelope 10.5 mm. and the ellipti- 
