172 Psyche [December 
Liometopum and Tapinoma, and two to Pheidole, all of which 
genera are commonly the hosts of inquilines, Prenolepis less 
frequently than the others. The inquilines found are mostly 
undescribed species of genera known to be of myrmecophilous 
habits, but a new Diaprid, Hemilexis jessei, and a new genus of 
Bethylidee, Bruesiella formicaria, both of which are probably 
parasitic on the host ant, are described. There is also an in- 
teresting new genus of cockroach, Myrmecoblatta rehni, which 
inhabits nests of various species of ants, where it no doubt officiates 
as scavenger. The occurrence of the weevil Liometophilus manni 
Fall at Pachuca, with the same species of host with which it has 
been found in Arizona shows that it is definitely associated with 
this ant. 
I have included in this paper a few remarks on the synonomy of 
some species from north of the Mexican boundary, and erected a 
new subgenus to contain certain of our species of Cremastocheilus. 
ORTHOPTERA. 
Family Buarrip». 
Subfamily BLATTIN. 
Myrmecoblatta gen. nov, 
Female: Body elongate oval, not greatly flattened, the abdomen about as broad 
as the thorax. Head almost concealed by the pronotum, only a narrow strip of 
the vertex showing. Head small, triangular, the vertex somewhat swollen. 
Eyes well developed, elongate, emarginate on inner border. Antenne long and 
slender, the first joint thickened, the second small, the third longer than the second 
and twice the length of the fourth. Thorax longer than broad, convex above, 
tegmina and wings absent. Abdomen convex above, beneath gradually elevated 
to the middle, which is therefore broadly carinate. Supra-anal plate semi-orbic- 
ular, evenly rounded in outline. Cerci large, with eight distinct joints. Sub- 
genital plate apparently provided with valves. Last ventral segment completely 
divided by a V-shaped slit. Legs short and robust, with abundant fine, short 
hairs. Femora weakly armed beneath, and with a strong spine at apex; tibie 
spined at apex and on outer margin. 
Male: Form broad. Pronotum entirely concealing the head. Tegmina more 
than half as broad as long; short, not reaching apex of abdomen, with poorly 
developed veins. Wings short and broad, less than half the length of tegmina, 
with poorly developed veins. Supra-anal plate more than twice as long as broad, 
the sides concave in outline, posterior border notched at middle, rounded on either 
side. Sub-genital plate broader than long, straight at sides, rounded behind, 
slightly concave at middle, bearing two equal stylets. 
Type: Myrmecoblatta rehni sp. nov. 
