MANN: THE ANTS OF BRAZIL. 489 



with flattened surface, reflexed at base. Petiolar node thick; rounded 

 above and at sides, a httle broader than long; in profile rounded in 

 front, nearly straight behind ; the postero ventral surface of the petiole 

 with a rounded projection. Ventral surface of mesothorax with an 

 angulate tooth at anterior third. Gaster elongate oval, about two 

 thirds as long as the thorax. Legs very long and slender. 



Head sublucid, finely, densely, and evenly punctate. Thorax 

 shining, minutely punctate. Epinotum finely striate, sublucid. 

 Node sublucid, more coarsely striate transversely. Gaster shining, 

 finely striolate. 



Head without pubescence but with sparse, erect pile, antennae more 

 coarsely pilose, funiculus pubescent, and with erect pile. Thorax, 

 petiole, and node without pubescence, and but sparsely pilose. Gaster 

 with scattered pubescence and sparse erect pile. Legs pilose, tibiae 

 with a little pubescence. 



Color dark ferruginous, the thorax lighter in color than the head 

 or abdomen. Pile and pubescence white. 



Described from several workers taken at Abuna. This is a very 

 aberrant form, resembling at first sight one of the elongate American 

 species of Dolichoderus. The long neck and the divided epinotum 

 widely separate this species from those others which have been in- 

 cluded in the genus Dendromyrmex. 



Camponotus {Dinomyrme.r) agra Smith has the occiput drawn out 

 into a neck, and the head of the worker minor resembles that of 

 Dendromyrmex branneri, but the thoracic structure is entirely different. 



The following key will serve for the identification of the species of 

 Dendromyrmex. 



Form very long and slender ; occiput drawn out into a narrow neck 

 which is longer than broad; epinotum divided by broad trans- 

 verse depressions into two portions (saddle-shaped in profile). 



branneri Mann 



Form more robust; occiput not long; epinotum not divided. ... 1 



1 . Thorax brown, or yellowish brown 2 



Thorax black, or at least dark brown 4 



2. Gaster shining chartifex Smith 



Gaster opaque 3 



3. Head smaller; occiput faintly margined; color yellow. (British 



Guiana) chartifex var. felis Mann 



Head larger; occiput not margined; color reddish. (Brazil) 



chartifex var. mamoreensis Mann 



