10 
Psyche 
[February 
slowed up, appeared to be disturbed and jerked from side to side. 
The ejected individuals immediately headed for the mass and 
crawled into it and the whole, thus redintegrated, then quickened 
its pace and was soon moving along as before. 
Fig. 1. Sawfly larvae from Kartabo, British Guiana. X 1% 
Mr. S. A. Rohwer kindly examined a number of the larvae 
taken at Kartabo and reported as follows: “I regret that I am 
unable to help you very much with the identification of these 
specimens. We know so little about the larvae of exotic saw- 
flies and especially about those from South America. The only 
thing I can do is to guess as to the group to which your specimens 
belong. They remind me very much of the larva of Perga, and 
as this group is not represented in South America, but is replaced 
by another subfamily, I venture to suggest that your specimens 
belong to the family Perreyidae, subfamily Syzygoniidae ( Philo- 
mastiginae of my classification of 1910). I imagine that the 
crawling larvae you saw were in their last feeding stage and were 
looking for a place for pupation. I should also imagine that they 
had fed gregariously and that they would cocoon gregariously. 
Perhaps their cocoons will resemble those of the Australian genus 
