1914] ’ Mann—Myrmecophilous Insects from Mexico 183 
Head much broader than long, with straight sides, rounded 
posterior corners and straight posterior border. Clypeus 
broadly rounded in front. Mandibles slender, curved; the 
tip thick. Eyes large and flat, located in front near sides 
at about half their length from base of clypeus. Ocelli ab- 
sent. Antenne 12-jointed, short and thick, the first joint 
swollen, as long as the second and third together; second 
joint shorter than third, joints 3-11 subequal, eylindrical, 
longer than broad; apical joint about twice as long as 
penultinate. Head and antenne shining, minutely 
punctate, the vertex with four distinct fovez arranged 
trapezoidally. Prothorax transverse, narrowed in front 
to form a short, thick neck, sides slightlyrounded; post- 
erior border concave. Mesothorax transverse, flat above; 
the pleurz extended into broad, vertical lamelle, which 
incline slightly backward toward the base. Metanotum 
narrower than mesonotum, longer than broad, widest be- 
hind; depressed at middle, the posterior border acutely 
carinate; posterior surface flat. Abdomen with a short 
thick petiole; a little longer than head and thorax, sub- 
cylindrical. Legs stout, the femora enlarged, flattened, 
middle tibize with five strong spines on outer edge. The 
entire body with very sparse scattered erect, black hairs, 
tarsal joints spinose at apex. 
; : : j Fig. 4. 
Described from a single specimen taken with Bryesiella formicaria 
Formica microgyna rasilis var. nahua Wheeler — gen. & sp. nov. 9 
at Guerrero Mill. 
Family PreRoMALIp«®. 
Pheidoloxenus wheeleri Ashmead. 
A single specimen of this wingless parasite was found with 
Pheidole ceres Wheeler var. tepaneca Wheeler at Guerrero Mill. 
Wheeler, who discovered the species in nests of Pheidole instabilis 
in Texas, considered that it is entoparasitic, either on the ants or 
their brood. 
Family Eucuarip2. 
Orasema tolteca sp. nov. 
Female: Length4mm. Head triangular, slightly longer than broad, with convex 
occipital border and nearly straight sides. Mandibles bidentate, the teeth long 
and acuminate; front flat; clypeus and frontal area separated from the remainder 
of front by a deep impression. Eyes oval, large, very convex; ocelli large and 
