132 
Psyche 
[August 
ON SOME TROPHOBIOTIC COCCIDiE FROM BRITISH 
GUIANA. 12 
By Harold Morrison. 
Bureau of Entomology, Washington, D. C. 
Representatives of all of the species of Coccidse discussed in 
the following pages were collected by Dr. W. M. Wheeler of 
Bussey Institution, Harvard University, in the course of his 
investigatoins at the Tropical Research Station of the New York 
Zoological Society in British Guiana and were recently submitted 
to the writer for determination. Critical study of the material 
available for examination in the National Collection of Coccidse 
has shown that two of these species have also been collected in 
certain of the West Indian islands by the writer and others, and 
this opportunity has been taken to add these records to those 
from British Guiana. 
SUBFAMILY MARGARODINiE 
GENUS STIGMACOCCUS HEMPEL. 
Stigmacoccus asper (Hempel) 
A number of specimens of this species were received with 
the following note by Dr. Wheeler: 
“No. 757. Kartabo, B. G. Sept 5, 1920. Taken from a 
huge colony of Cremntogaster sp. (near acuta Fabr.) nesting under 
bark of a large standing tree. The nest covered an area of more 
than 12 square feet and contained several hundred coccids 
enveloped in black carton. The young coccids were golden 
yellow, the older darker.” 
Published with the permission of the Secretary, U. S. Department of Agriculture. 
2 — The intimate relations described — as existing between ants on the one hand and the 
various Homoptera — on the other hand — have a common peculiarity. In all of these cases 
the ants are supplied with food in the form of an excretion or secretion elaborated from the 
juices of the plants. Wasmann has therefore designated these relationships as Irophobiosis to 
distinguish them from the cases of myrmecophily proper — (Wheeler, Ants, etc. New York, 
Columbia Univ. Press, 1013, p. 360). 
