2 Psyche [February 
all of these species except barbatus, and the insufficient evidence of 
this really being an Antennophorus, that the genus will prove to be 
peculiar to the north temperate zone and to comprise species which are 
always parasitic on ants of the genus Lasius. As this group of ants is 
abundantly represented in North America, we should expect the 
parasitic genus to have a like representation. ‘This turns out to be 
the case, since during the spring of 1909 I succeeded in finding near 
the Arnold Arboretum at Forest Hills, Boston, Massachusetts, two 
typical Antennophori allied to the four known European species 
(uhimanni Haller, foreli Wasmann, pubescens Wasmann and grandis 
Berlese). ‘The American forms occurred, as was to be expected, on 
workers of the common yellow ants belonging both to the typical genus 
Lasius and to the subgenus Acanthomyops, which is peculiar to the 
nearctic fauna. Only one of the mites, the one I call A. donisthorpei, 
was seen in a living condition. It was perched on the gula, or lower 
surface of the ant’s head, actively waving its long, antenniform fore- 
legs about in the manner so often described for the various European 
species. There can be little doubt, therefore, that, like its trans- 
atlantic cousins, it titillates its host or any ants within reach of its 
appendages and induces them to feed it with droplets of regurgitated 
food. Janet* has shown that when only a single A. pubescens is 
present on the European L. miatus it clings to the ventral surface of 
the ant’s head, with its forelegs directed towards the ant’s mouth-parts. 
When two are present, there is one on each side of the head or one on 
each side of the gaster; in the former case the antenniform appendages 
are directed towards the anterior, in the latter towards the posterior 
end of the ant’s body. When there are three mites, one attaches 
itself to the gula and the two others to the sides of the gaster. Four 
place themselves in pairs on the sides of the head and gaster. If six 
are present, which rarely happens, four are arranged in pairs on the 
sides of the head and gaster, while of the two remaining individuals, 
one attaches itself to the gula, the other to the mid-dorsal surface of the 
gaster. Janet believes that these symmetrical arrangements are for 
the purpose of balancing the burden and thus making it easier for the 
ants to carry. 
As the species of Lasius on which both the European and North 
American Antennophori occur, are specially devoted to attending root- 

1 Sur le Lasius mixtus, L’Antennophorus uhlmanni, ete. Etudes sur les Fourmis, les 
Guépes et les Abeilles Note 13. Limoges 1897, 62 pp., 16 figs. 
