102 
Psyche 
[June 
of a few outstanding features, should suffice to characterize it. Note 
the rather V-like outline of the posterior excision of the head. Head 
slightly more depressed, less convex above, than in A. ocellatus. 
The outstanding trait is the fine, nearly opaque, densely rugulose- 
punctulate sculpture of head and truncus. Among the rugules are 
crowded numerous small piligerous fossae, especially on the dorsum 
of the head, but these are clearly visible only in certain lights. Sides 
of truncus finely punctulate-rugulose, except for the lowest part of 
the mesothorax, which is smooth and shining. The hairs are abun- 
dant, particularly on head and promesonotum, but also present on 
nodes, short and inclined, slender but blunt, often feebly flattened 
or clavate toward their apices, those on the head directed anteriad. 
Pilosity otherwise as described for the genus. 
Humeral angles obtuse, not strongly projecting. Propodeal teeth 
diverging, very feebly curved as seen from above. 
The mandibles lack preapical armament, and there is not even a 
distinct welt at the site of the trigger hair, though a formation 
extending internally to the base of the hair can be seen within the 
transparent cuticle of the inner mandibular margin. 
Petiole with a low, rounded node (Fig. 2), the lower anterior 
slope with a low median carina,; node obout 0.22 mm long and 0.18 
mm wide; postpetiole subglobular. Petiole and postpetiole densely 
and finely reticulo-punctulate and opaque, except for the almost 
completely smooth, shining nodal summits. 
Color light reddish ferruginous; nodes and gaster yellowish fer- 
ruginous; but the gaster with the middle third shading into a broad 
brownish-red transverse band; appendages yellow to straw. 
Paratype variation is slight on the whole (see Table I). Workers 
from Boraceia, S. Paulo State, have the upper as well as lower 
mesopleura largely smooth and shining. Color varies from light 
to medium ferruginous. 
Queen : Measurements of a queen from the type locality are given 
in Table I. Her distinguishing specific characters correspond in the 
usual way to those of the worker. Mesonotum with crowded, slightly 
vermiculate longitudinal rugulae, interspersed with small fossae. 
Pronotum and propodeum transversely rugulose. Mesopleura with 
the upper half rugulose or smooth; lower half mostly smooth and 
shining. 
Male from the type nest series: TL 2.8, HL 0.52, HW without 
eyes 0.45, with eyes 0.54, L antenna 2.0, ML 0.05, WL 0.90, L 
forewing 2.55 mm. 
