ERRATA AND CORRIGENDA. 



Throughout for " Corumba" read Corumba. 



Page 37, for " stalli " read stalii. 



Page 107, No. 149, for "furculata" read furcillata. 



Page no, for "Abracis" read Abracris. 



Page 132, for "Pezottix arrogens" read Pezotettix arrogans. 



Page 187, reverse scale of reduction for figures in plates X and XI. 



Page 206, for the last two lines on page read: "Apparently confined to higher 



elevations; the three examples above listed all coming from the Paramo 



de Rosas in the Venezuelan Andes." 

 Pages 222-356, in Dr. Arnold E. Ortmann's Paper upon the Families and 



Genera of the Najades, make the following changes throughout: 

 For "Fusconaja" read Fusconaia. 

 For "Nephronajas" read Nephronaias. 

 For "Amygdalonajas" read Amygdalonaias. 

 Page 265, in legend of figures 9 and 9a for " Pleurobena" read Pleurobema. 

 Pages 427, 435, 441, for "borelli" read borellii. 

 Page 451, for "Leurocererus" read Leurocerus. 

 Page 479, for " Arnila cylindrodes" read Arnilia cylindrodes. 

 Page 479, for "Opshontala " read Opsomala. 



IX 



