472 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY.» 
182. Azteca chartifex Forel var. 
Several workers of a variety of this species were taken at Abuna. 
183. Azteca fasciata Emery var. similis, var. nov. 
Minor and major workers from colonies found at Madeira-Mamoré 
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 extends 
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. Mesoépinotal 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 workers taken at Abund. 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. 
