436 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
86. Pheidole (Pheidole) biconstricta subsp. burtoni, subsp. nov. 
Plate 3, fig. 24. 
Soldier. Length 6 mm. 
Head, excluding mandibles, a little longer than broad, much nar- 
rowed in front, with convex sides, narrowly rounded occipital corners 
and deeply and narrowly excised posterior border. Mandibles thick, 
the blade with five short, very blunt teeth and a large subapical tooth. 
Clypeus rather flat, feebly carinate; anterior border strongly excised 
at middle. Frontal area large, triangular, impressed. Frontal cari- 
nae a third as long as antennal scapes. Antennal scapes broadly 
rounded at base, somewhat thickened apically, extending less than 
half the distance from the eyes to posterior corners of head. Club 
as long as the remainder of funiculus; funicular joints 2-7 as long as 
broad. Eyes small, convex, located at sides of anterior third of head. 
Pronotum similar to that of P. biconstricta, but the corners are some- 
what more angulate. Mesonotum slightly convex above, with feeble 
transverse impression posteriorly. Base of epinotum much less im- 
pressed than in P. biconstricta. Petiolar node and _postpetiole 
broader than long; the latter conical at sides. 
Subopaque, except the occipital corners, mandibles, and clypeus, 
which are shining. Mandibles strongly striate at base and regularly 
punctate throughout. Head coarsely shagreened, coarsely longi- 
tudinally rugose between the frontal carinae. Vertex and occiput 
with foveolate punctures. Thorax and abdomen shagreened, the 
gaster more shallowly than the rest. Legs finely punctate. Each 
of the foveolate punctures on the head bears a short, stiff, recumbent 
hair. Body, antennae, and legs throughout with long, stiff pile. 
Head, posterior portion of pronotum, and epinotum piceous; mandi- 
bles and clypeus red, the rest castaneous, the gaster distinctly lighter 
than the other parts. 
Described from a single soldier taken at Porto Velho. The sculpture 
of the head is very different from the other forms of P. biconstricta 
and the transverse mesothoracic impression is broader and more 
shallow. 
87. Pheidole (Pheidole) fallax Mayr subsp. emiliae Forel. 
Several soldiers and workers were taken at Manaos. 
