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MANN: THE ANTS OF BRAZIL. 403 
_The following table may help in separating the South American 
species of Platythyrea. 
A. Mandibles dentate. 
Bee ee oh OI, (OMTIIAREN hk. 5d Picci ol cides ielve « sinuata Roger. 
AA. Mandibles without teeth. 
a. Eyes as long as their distance from anterior border of 
head; petiole strongly bisinuate, the middle portion pro- 
longed into a short beak. Length 7.5 mm. (Venezuela, 
pS | a, EGS eS OP a i eee fee meinerti Forel. 
aa. Eyes smaller, petiole feebly sinuate. 
b. Petiole from above more than twice as long as broad, 
as long as first segment of gaster; femora swollen. Length 
6.7 to 7.7 mm. (Trinidad, Brazil)...... angusta Forel. 
bb. Petiole from above less than twice as long as broad, 
femora normal. 
c. Punctures on epinotum very coarse, dilatation of frontal 
_lobes more marked. Length 8 mm. (Venezuela, Brazil). 
incerta Emery. 
cc. Punctures on epinotum finer, dilatation of frontal 
lobes less marked. Length6to7mm. (Antilles, Central 
Sti OMEN AMRCRUER) 25% a5 oo sph tok our etonge punctata Smith. 
6. Typhlomyrmex rogenhoferi Mayr. 
One small colony, taken from a rotten log at Para. &. 
7. Rhopalopone relicta, sp. nov. 
Plate 1, fig. 4, 5. 
Worker. (Plate 1, figs. 4, 5). Length 2.5 mm. 
Head, excluding mandibles, distinctly longer than broad, broadest 
behind eyes, the width at occiput about equal to that at base of cly- 
peus; sides slightly rounded, posterior border feebly concave. Man- 
dibles long, rather slender, the blade minutely dentate; outer border 
arcuate at middle. Clypeus subtriangular, broadly rounded at ante- 
rior border, flattened in the middle. Frontal carinae very short, their 
basal lobes rounded. Antennae robust; scapes arcuate, extending 
barely to the occipital corners; first funicular joint as long as the two 
succeeding joints together; joints 3 to 9 broader than long; apical 
