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Psyche 
[Vol. 89 
loped mandibles’ ( Orthognathotermes ). Intermediate positions are 
occupied by forms with ‘slight nasus development /well-developed 
mandibles’ (such as Cornitermes ) and ‘well-developed nasus/ well- 
developed mandibles’ ( Armitermes ). Grigiotermes, with no soldier 
caste, cannot be placed on this spectrum. 
These data also show that soldiers with very well- to well- 
developed mandibles and poorly developed nasi are both heavier 
and longer than soldiers with vestigial mandibles and well-developed 
nasi, Armitermes once again occupying an intermediate position. 
Complete taxonomic descriptions for Grigiotermes metoecus, 
Armitermes euamignathus, Cortaritermes silvest ri, Velocitermes 
paucipilis, and Orthognathotermes gibberorum can be found in 
Mathews (1977). Procornitermes araujoi is fully described in Emer- 
son (1952). Samples of Cornitermes cumulans collected during the 
study in Brasilia were identified following Emerson (1952). Al- 
though the general head and mandible forms were consistent with 
the published description, head length and width measurements 
were much lower than those previously described for this species. 
However, Emerson indicated that there is considerable variation in 
mean measurements between colonies from different localities. The 
samples from Brasilia were compared with various other species in 
the Museu Zoologia de Universidade de Sao Paulo (MZSP). The 
most closely related species was C. villosus which was clearly differ- 
ent in that it had a greater number of setae and differently shaped 
mandibles. As a result of this divergence the best classification 
appears to be C. cumulans. Specimens from Brasilia have been 
deposited in the MZSP and the Museum of Comparative Zoology, 
Harvard University. 
Samples of Nasutitermes sp. collected from the Distrito Federal 
were compared extensively with material in the MZSP but differed 
from all species examined. N. coxipoensis most resembled the Nasu- 
titermes we studied but differed in being smaller and in having a 
more oval shaped head. Further studies on these two forms are 
necessary to determine whether these differences are sufficient to 
warrant calling it a new species. 
B. Weights 
Fresh weights were measured on a Mettler balance. Fifty workers 
and fifty soldiers from each of three different nests were weighed, 
except for Syntermes for which only fifteen individuals of each caste 
