DEVELOPMENT OF CASTES OF TERMITES. 



Gilson's fluid has proved a good fixative for the newly hatched 

 nymphs, and Benin's fluid is excellent for all older forms. As in 

 the case of Reticulitermes whole mounts of the newly hatched and 

 developing nymphs, stained with Conklin's picro-haematoxylin, 

 are most useful for preliminary study. 



The termites to be described in this paper are Termopsis 

 angusticollis Walker, Calotermes n. sp. Banks, Cryptotermes 

 cavifrons Banks, Neotermes castaneus Burm., Arrhinotermes sim- 

 plex Hagen, Reticulitermes flavipes Kollar, R. virginicus Banks, 

 and R. n. sp. Banks, A noplotermes fumosus Miiller, Amitermes 

 tubiformans Buckley, Eutermes pilifrons Holmgren, E. morio 

 Latreille and E. sanchezi Holmgren. 



In the accompanying table it may be seen that the first four 

 genera belong to the family Protermitidse of Holmgren, the 

 fourth, together w^ith Reticulitermes, belongs to the Mesoter- 

 mitidae, and the last three are Metatermitidse. The present 

 paper therefore includes examples from each family of the order 

 Isoptera. 



My study includes for each genus (i) the eggs, (2) the newly 

 hatched nymphs, in some cases these have been actually dis- 



