B.S. 21942. Lagoon with 
vegetation covering entire shore- 
line. Resistencia, Chaco, 
Argent ina. 
July 8, 1920. 
B.S* 21943* Termite nest. 
Chaco, Argentina. 
July 8, 1920. 
Resistencia, 
B.S. 21944* The Rio Negro, a 
typical sluggish stream, near the 
Rio Paraguay. Resistencia, Chaco 
Argentina. 
July 8, 1920. 
