Vou. II, Pr. IT] WHEELER—GALAPAGOS ISLANDS ANTS 269 
Brownish yellow; legs paler; posterior two-thirds of head 
somewhat darker and more reddish, borders of mandibles 
blackish, anterior clypeal border deep red. 
Worker. Length 1.5 mm. 
Head elliptical, longer than broad, rounded and entire 
behind, with the eyes just in front of the middle of the sides. 
Mandibles rather narrow, with about six teeth. Clypeus 
convex in the middle, its anterior border feebly but distinctly 
notched in the middle. Frontal carinz very short. Antenne 
much as in the soldier, scapes reaching nearly one-third their 
length beyond the posterior border of the head. Thorax like 
that of the soldier, but the pronotum much less convex and 
narrower, the mesonotum much less convex in profile and 
the spines of the epinotum reduced to minute, slender teeth. 
Petiole slender, its node low, with entire superior border; 
postpetiole small, subglobular. 
Smooth and shining; mandibles sparsely punctate; cheeks 
longitudinally rugulose; meso- and epinotum, petiole and 
postpetiole subopaque, finely and indistinctly punctate. 
Pilosity shorter and much less conspicuous than in the 
soldier, appressed on the scapes and legs. 
Yellow; dorsal surface of head and gaster brownish; man- 
dibular teeth blackish. 
Female. Length 5—5.5 mm. 
Head resembling that of the soldier, but a little narrower 
in front than behind, with nearly straight posterior border. 
Thorax large, as broad as the head, mesonotum nearly cir- 
cular, flattened, as is also the scutellum. Epinotum with the 
declivity sloping, distinctly longer than the base, the spines 
stout, scarcely longer than broad at their insertions. Petiolar 
node less deeply excised above and postpetiole more trans- 
verse than in the soldier. Gaster large, of the usual shape. 
Wings measuring about 6 mm. 
Mandibles and clypeus rather shining, the former striato- 
punctate, the latter longitudinally rugose. Head subopaque, 
longitudinally rugose, the rugz extending to the occiput 
where they are mingled with coarse longitudinal punctures. 
Pronotum, pleurz, epinotum, petiole and postpetiole opaque 
and densely punctate. Epinotum coarsely transverely rugose 
between the spines, the postpetiole longitudinally rugose. 
