180 Psyche [December 
should be included with these, though in some specimens the 
mentum is very feebly notched. 
The species which belong to Cremastocheilus subgenus Cre- 
mastocheilus have the mentum distinctly incised behind and are 
all native of the Atlantic states. The type of the genus Cre- 
mastocheilus is C. castanee Knoch. 
Cremastocheilus (Myrmecotonus) mexicanus West. 
Several specimens, found with Formica subcyanea Wheeler at 
Guerrero Mill agree closely with others identified as this species 
from nests of Formica gnava Buckley in the Huachuca Mts. 
(Schaeffer) and from the Santa Rita Mts., Arizona (Snow). 
There is in this series, as in other species in the genus, considerable 
variation in sculpture and pilosity as well as in size. 
Cremastocheilus (Myrmecotonus) armatus Walker. 
C. pilisicollis Horn. 
Recently I examined the type and several paratypes of C. 
armatus in the British Museum, and compared with specimens of 
the form which is identified in collections as pilisicollis Horn. 
The two are identical, so the latter name must fall into synonomy, 
as was considered probable by Horn. (Monographic Revision of 
the species of Cremastocheilus and Synopsis of the Euphoriz of 
the United States. Proc. Amer. Phil. Soc. XVIII, 1879, p. 390). 
Family CuRcULIONID. 
Liometophilus manni Fall. 
A single specimen of this curious weevil was taken at Pachuca 
in the galleries of a colony of Liometopwm apiculatum Mayr. 
The species was first found in Southern Arizona, where it lives 
with a variety of the same ant. The oily-red color, so character- 
istic of the chitin in many beetles of myrmecophilous habits, is 
evident at the middle of the anterior elytral margin, where the 
scales are absent, probably having been gnawed off by the ants. 
This is, so far as is known, the only truly myrmecophilous weevil 
found in North America. 
The Mexican specimen (length 4 mm.) is considerably larger 
than a paratype from Arizona in my collection, and the light- 
