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 (Cephalotcs) 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 Abuna, 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- 



