1952] 
Wheeler ayid Wheeler — Ant Larvae 
107 
ants, which feed on seeds (Pogonomyrmex, Messor) also 
nourish their young with the same food.” 
Wheeler (1928, p. 202) stated that the larvae of this 
genus are fed with fragments of seeds, but the very young- 
est larvae are fed on regurgitated food. (=1926, p. 243.) 
Pogonomyrmex barbatus (F. Smith) 
(PI. 11, figs. 14-22) 
Stout; diameter greatest at the fifth abdominal somite, 
slightly attenuated anteriorly ; thorax very stout and arched 
ventrally but not differentiated into a neck; posterior end 
broadly rounded. Anus subterminal. Leg, wing and gono- 
pod vestiges present. Nine differentiated somites. In- 
tegument sparsely spinulose on the ventral surface of 
mesothorax, metathorax and anterior abdominal somites 
and on the dorsal surface of the last few abdominal somites. 
Body hairs moderately numerous and rather uniformly 
distributed; with the distal half finely denticulate. Of two 
types: (1) short (0.05-0.12 mm), uniformly distributed; 
(2) long (0.31-0.42 mm), moderately abundant on the 
ventral surface of the thorax, elsewhere reduced to a 
single row around the middle of each somite. Cranium 
subcircular in anterior view, but with the genal outlines 
somewhat flattened. Antennae small slightly raised discs 
each with three sensilla, each of which bears a moderately 
long sharp spinule. Head hairs numerous, short to long 
(0.045-0.14 mm), with the distal half sparsely denticulate. 
Labrum small and short (breadth 2X length), bilobed, not 
narrowed ventrally; anterior surface of each lobe with two 
minute hairs, five isolated sensilla and a few minute 
spinules; ventral border of each lobe with two sets of two 
contiguous sensilla and a few spinules; posterior surface 
of each lobe with two contiguous and about five scattered 
sensilla, sparsely spinulose, the spinules coarse and iso- 
lated or in short rows. Mandibles robust and heavily 
sclerotized ; apical tooth moderately long, moderately 
slender, tapering only slightly to a round point; medial 
teeth short, robust and round-pointed, the proximal curved 
medially and posteriorly, the distal pointed anteroventrally. 
Maxillae with the apex conoidal and spinulose, the spinules 
minute and isolated or in short rows ; palp paxilliform with 
