50 
Psyche 
[March 
On Aug. 4, at 3 :30 p.m. I witnessed a raid of Harpagoxenus 
and subsequently saw several others from the same nest. 
The raids differed in only one respect from those which I 
described in a previous paper (’27). The tendency of the 
raiders to move in columns, which I saw only once during 
former observations, was a regular feature of these raids. 
There were never more than six ants in a column. They 
moved in single file and kept quite close together. Their 
antennae were rapidly vibrated and constantly brought in 
contact with the substratum or the ant ahead. 
It may be of interest to note that Harpagoxenus americanus 
is now known to occur as far north as Boston, Mass. In the 
spring of 1927 I took a single female in the Blue Hills Reser- 
vation. The nest was small and contained, beside the queen 
eleven workers of L. longispinosus and a small amount of 
brood. No Harpagoxenus workers were present. The known 
range extends from Massachusetts through southern New 
York, New Jersey and eastern Pennsylvania as far south as 
Washington. It is likely that in the future our knowledge of 
its southern range will be considerably extended but the 
scarcity of the insect in Massachusetts points to this state 
as the northern limit of its distribution. 
Literature cited: 
Creighton, W. S. 
1927. The Slave-Raids of Harpagoxenus americanus. Psyche, 
Vol. 34, p. 11-29. 
Sturtevant, A. H. 
1927. The Social Parasitism of the Ant Harpagoxenus 
americanus. Ibidem, p. 1-9. 
