PSYCHE 
VOL. XXXVIII JUNE - SEPTEMBER, 1931 Nos. 2-3 
ANTS COLLECTED ON CAPE COD, MASSACHUSETTS 
By A. H. Sturtevant 
California Institute of Technology, Pasadena, California 
The list below represents the results of collections made 
each summer from 1925 to 1930 inclusive. Ants have been 
recorded from Cape Cod by Wheeler (1906, 1910, 1913) ; 
these records have not been reproduced in the present list 
except where they represent localities or forms not included 
in my own collections. 
All available records are included, even for the com- 
moner ants, with the result that a rough estimate of the 
frequency of a species on the Cape may be made by noting 
the number of localities from which it has been taken. The 
dates given represent the extremes between which winged 
queens or males have been collected. Dates in parentheses 
are from neighboring portions of eastern Massachusetts 
when these extend the limits found for Cape Cod. 
The list as given cannot be supposed to represent the 
entire fauna of the region. Three forms in particular were 
expected and carefully searched for, without success — 
Lasius aphidicola, L. inter jectus, and Camponotus caryx. 
They are certainly either absent or much less common than 
in neighboring portions of the mainland. Other forms that 
may be expected are Pheidole pilifera (recorded by Wheeler 
from Naushon) and Tetramorium cespitum (which I have 
taken at Rochester, only a few miles from the Cape) . 
Cape Cod apparently represents the northern limit, or 
very nearly so, for the range of several ants : Monomorium 
minimum , Aphaenog aster treatx, Leptothorax davisi, Pren- 
