520 THE AMERICAN NATURALIST. [Vor. XXXV. 
on this peculiarity as representing a decided step towards the 
conditions exhibited by the guest ant, Formicoxenus nitidulus 
(g.v.. It is of even greater interest in connection with the 
habits of its congener, L. emersont. 
3. Monomorium minutum Mayr., var. minimum Buckley. 
This widely distributed ant forms small but very populous 
nests, containing from one to a dozen or more dedlated queens 
and hundreds or even thousands of workers. It is very com- 
mon under stones in the open cedar brakes in many places 
about Austin, Texas. Usually its nests are solitary, but it fre- 
quently forms double nests with the larger ants of the vicinity. 
I have often found it with Camponotus maculatus, subsp. sansa- 
beanus ; C. fumidus, var. Jestinatus ; Formica subsericeo-neorufi- 
barbis ; Pachycondyla harpax; and under small stones on the . 
summits of the nest-cones of Pogonomyrmex barbatus, var. 
molifaciens Buckl. The large ants are assailed with fury when 
the nests are disturbed and they accidentally stumble into the 
galleries of the Monomorium. These minute black ants, how- 
ever, are not altogether averse to the society of other ants, as 
is shown by their forming mixed nests with two interesting 
species to be considered below, viz., Leptothorax (Dichothorax) 
pergandet Emery and Epacus pergandei Emery. 
4. Forelius fetidus Buckley (— Forelius mccooki Forel). 
Attention was first directed to this small, dull yellowish 
dolichoderine ant by McCook, who found it living amicably 
within the nest boundaries of the Texan agricultural ant 
(Pogonomyrmex barbatus, var. molifaciens). The substance of 
his observations is contained in the following remarks (79, 
p. 202): * Numbers of these ants were frequently seen trav- 
eling in long lines across or near to the nest of Barbatus 
(PL XXIV, Fig. 118). Usually their route was established 
upon blades of grass growing on those nests which were cov- 
ered with the Aristida, or along the low tufts of grass on the 
margin of the disk. They seemed to prefer this elevated transit 
to moving directly upon the surface, which they touched only 
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