472 bulletin: museum of comparative zoology. 



182. Azteca chartifcx Forel var. 

 Several workers of a variety of this species were taken at Abiina. 



183. Azteca fasciata Emery var. similis, var. nov. 



IVIinor and major workers from colonies found at Madeira-Mamore 

 Camps 39 and 41 differ from Emery's description and figure of A. 

 fasciata from Santarem in color and in having the antennal scape 

 noticeably longer. In the smaller worker of A. fasciata it extendi 

 barely past the occipital corners while in A. similis it exceeds these 

 corners by a full third of its length. In A. similis the larger workers 

 have the head, pronotum, anterior femora, and antennal scapes red, 

 and the rest of the body dark fuscous. The smaller workers have the 

 vertex, and part of the pronotum infuscated. In other characters 

 it agrees closely with typical A. fasciata. 



184. Azteca lanuginosa Emery subsp. pruinosa, subsp. nov. 



Worker. Length 3.5 mm. 



Head, excluding mandibles, as broad as long, appreciably narrowed 

 in front, with strongly convex sides, narrowly rounded occipital corners 

 and shallowly excavated border. Clypeus convex, the anterior border 

 bisinuate, projecting and rounded at middle. Mandibles with a thick, 

 blunt subapical tooth and five small teeth on the blade. Antennal 

 scapes in the largest workers barely attaining the occipital corners, 

 in the smaller ones slightly surpassing them. Mesonotum very con- 

 vex and elevated. Mesoepinotal suture strongly impressed. Node 

 in profile deeper than thick, evenly rounded above. 



Mandibles subopaque, densely striolate longitudinally. Head, 

 thorax, and abdomen subopaque, finely, densely punctate. 



Head and body evenly covered with fine pruinose pubescence. No 

 erect hairs present, except a very few on the gaster. 



Color dark fuscous; clypeus, antennal scapes and legs lighter. 



Described from a number of w^orkers taken at Abuna. This form is 

 less shining than A. lanuginosa, the pubescence is more abundant and 

 is closely appressed and not lanuginose in character. Otherwise the 

 variety agrees with the typical form. 



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