538 THE AMERICAN NATURALIST. [Vor. XXXV, 
13. Xenomyrmex stollii Forel (Fig. 13). 
X. stollii is a small, smooth, dark brown ant, allied to the 
species of Monomorium. It is a native of Guatemala and was 
found, together with its larvae and pupe, living in a huge oak 
gall in company with a much larger ant, Camponotus abscisus 
Rog. More recently a sub- 
species, Jforidamus, of this 
same species was discovered 
at Lake Worth, Fla., by Mr. 
Pergande. (See Emery, '95, 
pp. 275, 276.) On this oc- 
casion the ants were living, 
unaccompanied by another 
species, in a hollow twig of 
Ayderoxylon masticodendron. 
Wasmann (94, p. 163) ex 
presses some doubt as to 
whether the Guatemala form 
really forms a mixed colony 
with the Camponotus, since 
the ants are members of dif- 
ferent subfamilies ; but he 
nevertheless regards this case 
as in a sense transitional to the mixed nest, since Xenomyr- 
mex appears to build no nest of its own. From an inspection 
of our Texan oak galls, which are frequently inhabited by 
ants, I feel sure that nests of very small size on the plan 
Fic. 13. — Xenomyrmex stollii Forel. Worker. 
occurrence of Formicoxenus in this country. My own reference to this form as 
occurring at Colebrook, Conn. (00, 8, footnote), is based on a wrong identi- 
cation. The species there si is really Zeptothorax nasi which in 
size, color, and superficial appearance resembles Formicoxenus nifi 
wo additional species of Formicoxenus have been recently discovered - 
Europe, and both have been described from female specimens only. Z. ravouxi 
André ('96) was captured in a normal nest of Leptothorax tuberum Fabr., subsp. 
enint Latr., provided with fertile queens. The host of the other spe — 
corsicus, described by Emery ('95 a, p. 12), is unkno 
Emery also describes (fóid, p. 11) another ant, Phaeris milie from a single 
specimen taken in a nest of Monomorium salomonis, var. subnitidum. Emery Te 
gards the new species as being in all probability parasitic or inquiline in tes e 
