[September 
198 Psyche 
ulkei colonies at Palos has been published (Park, Thomas, 
1929). 
Formica ulkei colonies are also established at Palatine, 
Illinois, some thirty miles north-west of Chicago under the 
same general ecological conditions. The Palatine colonies 
have not been as thoroughly studied for myrmecocoles as 
those at Palos, this latter section having been visited re- 
peatedly. 
A number of species of insects have been taken from the 
ulkei colonies. These species have been determined as fol- 
lows, 1 and the locality records given in order to supplement 
as much as possible the account of Holmquist (1928 a, pp. 
88-4) : 
TABLE I. Myrmecocoles of Formica ulkei Emery. 
Homoptera 
Cicadellidae 
1. A nymph taken at Palos, August 4, 1929, in the lower 
dome galleries. 
Neuroptera 
2. A neuropterous larva, very similar to the larvae of the 
Chrysopidae, taken in a lower gallery at Palos, 
August 4, 1929. It may have been brought in by 
the ants, or it may have wandered in, either by 
chance or to feed upon aphids. 
Diptera 
Syrphidae 
3. Microdon, sp. The larvae of Microdon were usually 
present in the nest, both in Palatine and at Palos, 
and were present in certain nests in great abun- 
dance on October 6, 1928, at Palos, especially in 
the less superficial galleries. 
H am greatly in debt to my friends, Mr. W. J. Gerhard and Mr. 
Emil Liljeblad, of the Field Museum of Natural History, for their 
care in determining and rechecking the material collected from the 
ulkei nests. 
