MANN: THE ANTS OF BRAZIL. 449 
nest was in the hollowed trunk of a small tree. It is omnivorous in 
habit, frequenting garbage and eating even carrion. Some dead 
macaws which I placed in the woods as bait for carrion-feeding insects 
were continually covered by C. atratus, to the exclusion of other 
insects. It is diurnal, and a striking form as it walks slowly about on 
tree trunks and logs. The hard spiny armor is sufficient to protect 
it from any ordinary enemy. 
122. Cryptocerus (Cephalotes) oculatus (Spinola). 
One colony from Para. 
123. Cryptocerus (Zacryptocerus) clypeatus (Fabricius). 
This species was very common at all places along the Rio Madeira, 
and at Itacoatiara and Santarem. A large colony was found nesting 
in a hollow parasitic vine. 
124. Cryptocerus (Cryptocerus) umbraculatus (Fabricius). 
A colony found at Abunda, Rio Madeira was nesting in a hollow 
branch near the top of a recently felled tree. 
125. Cryptocerus (Cryptocerus) inaequalis, sp. nov. 
Worker. Length 5.25 mm. 
Head broader than long, broadest behind the eyes; narrowed in 
front. Posterior margin straight, the angles projecting as lamellae, 
and broadly concave at apex. Sides and anterior corners of head 
evenly rounded. Anterior margin of clypeus deeply concave. Pro- 
and mesothorax together as broad as long; prothorax angulate at the 
anterior corners and with a pair of flat triangular teeth at posterior 
half of margin. Sides of mesothorax with a short slender spine at 
middle. Epinotum more than twice as broad as long, with two broad 
teeth at sides. Petiole and postpetiole subequal in width. Petiole 
with long, slender, backward curving spines. Spines of the postpetiole 
short and broad, projecting forward. Gaster broadly cordiform, 
very convex above; anterior third of sides broadly margined; excised 
at middle of anterior border. 
Subopaque. Sparsely, foveolately punctate above, except the gas- 
