274 Bulletin American Museum of Natural History, [Vol. XXIII, 



long, with thin, dilated lateral borders, and each with a notch just behind its 

 anterior angle. Mesonotum produced on each side into a short spine. Petiold 

 and postpetiole similar to those of the soldier. Gaster cordate-elliptical, propor- 

 tionally shorter than in the soldier. 



Opaque; whole surface finely and densely granulate-foveolate, the head, thorax,' 

 petiole and postpetiole somewhat more coarsely than the gaster. 



Hairs similar to those of the soldier but shorter; finer and denser on the gaster 

 and legs than on the remainder of the body. 



Black; anterolateral lobes and posterior corners of head, lateral borders of 

 thorax, spines of petiole and postpetiole, anterolateral corners of first gastric seg- 

 ment, antennae, knees and tibiae, sordid or brownish white. 



Male. Length: 4.5-5 mm. 



Head, excluding eyes, broader than long, convex behind, with very short, con- 

 cave cheeks. Mandibles with an acute apical and several small basal teeth. An- 

 tennae short, not much incrassated towards their tips; scape inuch shorter than 

 the second funicular joint, first fvmicular twice as broad as long, joints 2-11 subequal, 

 less than twice as long as broad, rather robust, terminal joint somewhat shorter 

 than the two preceding joints together. Thorax robust, somewhat broader through 

 the wing insertions than the head through the eyes; Mayrian furrows of pronotum 

 broadly impressed, shallow. Epinotum short, basal surface shorter than the abrupt 

 declivity with which it forms nearly a right angle. Petiole and postpetiole subequal, 

 rectangular from above, a little longer than broad. 



Opaque; petiole, postpetiole and gaster shining. Head and thorax densely 

 punctate or granular, the former with small, the latter with larger, shallow foveolae. 

 Mayrian and parapteral furrows coarsely longitudinally rugose. Petiole, post- 

 petiole and gaster coarsely shagreened. 



Hairs whitish, tapering, rather abundant, suberect; conspicuous on the body 

 but much sparser on the legs. 



Black; mandibles, antennae and legs white; bases of mandibles, the scapes and 

 bases of fore femora more or less infuscated. Posterior edges of gastric segments 

 and genitalia yellowish. Wings whitish hyaline, with colorless veins and light 

 brown stigma. 



Described from numerous soldiers, workers and males, all taken from 

 the same colony (Jan. 31). 



22. Atta cephalotes Linn. — Numerous small and medium sized 

 workers of this, "the wee-wee, or mound-builder," which is one of the few 

 ants also cited by Forel from British Honduras. 



23. Atta (Trachymyrmex) saussurei Forel. — Closely related, as Forel 

 has shown, to A. (T.) septentrionalis of the United States. The numerous 

 workers received from Mr. Johnson agree well with a typical specimen of 

 saussurei given me by Mr. Pergande. They differ from septentrionalis 

 in having a narrower head, much more convex and protruding eyes, longer 

 antennal scapes, which surpass the posterior corners of the head by nearly 

 \ their length, and more acute thoracic spines, of which four instead of three 

 pairs may be seen on the profile of the pro- and mesonotum. The post- 

 petiole is as long as broad instead of broader than long; the tubercles on 



