470 bulletin: museum of comparative zoology. 



Thorax robust, the anterior surface of the pronotum decUvous in 

 profile. Petiole and gaster similar to those of the worker minor. 



Body and legs without erect pile, sparsely pubescent. Antennae, 

 excepting the first two joints, very densely covered with rather long, 

 erect pubescence. 



Color black, legs and antennae dark fuscous. Wings hyaline. 

 Veins and stigma fuscous. 



Described from four major workers, three minors, and a male from 

 Itacoatiara. This form differs from the typical A. schumanni in not 

 having erect hairs on the antennal scape, the head is less narrowed 

 in front, and the clypeus is not depressed at the middle. Azteca 

 schumanni var. taediosa Forel is more robust and has the head less 

 excavated behind and the antennal scapes longer. 



173. Azteca miillcri Emery subsp. terminalis, subsp. nov. 



Plate 2, fig. 16. 



Worker major. Length 4 mm. 



Head, excluding mandibles, as broad as long, narrowed in front, 

 with strongly convex sides, especially opposite the eyes, narrowly 

 rounded occipital corners and deeply excavated border. Clypeus 

 convex, the anterior border straight, except at corners, where it is 

 slightly produced and rounded. Mandibles thick, with six strong 

 teeth. Antennal scapes barely extending to occipital corners. Meso- 

 notum in profile evenly rounded. Epinotum with subequal base and 

 declivity, the former broadly flattened. Node rather low, rounded 

 above. First segment of gaster depressed in middle at base. 



Shining, densely punctate throughout. Pubescence abundant, long 

 and recumbent. Pile of the scapes sparse and short, that of the body 

 longer. 



Color very dark fuscous; terminal half of antennae yellow, the color 

 becoming more intense at apex. 



Described from a series taken at Madeira-Mamore R. R. Camp 39. 

 The broadly flattened epinotum and the peculiar coloration of the 

 antennae distinguish this subspecies. It is evidently close to var. 

 A. nigella Emery from southern Brazil, but is larger and differently 

 colored. 



174. Azteca aurita Emery subsp. silvae Forel. 



A single colony of this distinct subspecies was found at Para, the 

 type locality. 



