3\l\nn: the ants of brazil. 485 



border truncate. Mandibles with six teeth. Eyes small, situated 

 posterior to middle of sides of head. Ocelli small. Frontal lamellae 

 elevated; enclosed area very slightly impressed at middle. Antennae 

 about two thirds as long as body. Pronotum narrow, anterior border 

 with raised margin which extends part way along the sides. Mesono- 

 tum much elevated, declivous in front, flattened above, with faint 

 indications of margin at sides. Epinotum rounded above and at 

 sides, margined at base. Node as in worker. Gaster ovate. Legs 

 long and slender. 



Head, thorax, epinotum, and node subopaque, densely, finely 

 punctate, minutely striolate transversely, with very sparse pubescence, 

 but with abundant, semierect pile. 



Gaster subopaque, densely punctate and striolate, both punctures 

 and striae being extremely minute. The pubescence is very sparse 

 and fine; the pile erect, not abundant. 



Scape of antennae and legs with many erect hairs; funiculi pubes- 

 cent. 



Color as in worker. 



Described from several workers and a female taken at Tumatumari, 

 British Guiana (Amer. Mus. Nat. Hist, collection). 



220. Dendroviyrmex chartifex subsp. mamoreensis, subsp. nov. 



Worker. Body much more robust than in the typical form of the 

 species. Head constricted behind the eyes, sides convex, occipital 

 border with edge rounded, without trace of margination. Sides of 

 head in front of eyes evenly convex, narrowed toward base of clypeus. 

 Clypeus strongly carinate. Mandibles with six teeth on the blade. 

 Surface of frontal area convex, longitudinally carinate at middle. 

 Antennae nearly as long as body, rather thick. Pronotum nearly as 

 broad as long, depressed, and broadly margined anteriorly; seen in 

 profile, the surface is convex; sides distinctly margined for three 

 fourths the distance to promesonotal suture. Mesonotum slightly 

 convex above, rounded at sides. Epinotum flattened, sides marginate. 

 Petiolar node, seen in profile on anterior side straight and perpendicu- 

 lar at base, then sloping to apex, with an acute angle between the 

 two surfaces; posterior surface convex; from behind, evenly rounded 

 above. Gaster ovate, short and thick. Legs long and slender. 



Body nearly opaque, gaster subshining; antennae and legs sub- 

 lucid. 



