1952] 
Wheeler and Wheeler — Ant Larvae 
115 
Body hairs sparse, somewhat sparser on the ventral surface 
of the abdomen, minute to long. Of three types : (1) simple, 
minute to short (0.003-0.054 mm), generally distributed; 
(2) denticulate, minute to long (0.012-0.28 mm), the most 
abundant type, (3) anchor-tipped, long (about 0.28 mm), 
with the shaft flexuous, four in a row across the dorsal 
surface of each abdominal somite i-vm. The denticulate 
hairs are extremely variable, the denticles may be few to 
numerous, limited to the tip or extending halfway to the 
base, closely applied to the shaft or suberect, the tip may 
be nearly straight, strongly curled or bifid. Only simple 
hairs are found on the ventral surface. Cranium as broad 
as long, broadest at the dorsal corners which bulge laterally, 
occipital outline rounded. Antennae with three (rarely 
four) spinulose sensilla each. Head hairs few, short to 
long, longest near the occipital border. Of two types: (1) 
denticulate, 0.05-0.21 mm; (2) simple, 0.035-0.07 mm. 
Labrum small, short (breadth 2X the length), bilobed, 
somewhat narrowed ventrally; anterior surface of each 
lobe with three or four minute hairs and a sensillum ; 
ventral border with two sets of two contiguous sensilla 
each ; posterior surface of each lobe with a central spinulose 
area, the spinules minute and in short transverse rows; 
six or seven scattered sensilla on the posterior surface 
of each lobe. Mandibles rather small and heavily sclero- 
tized; distal third forming a stout, sharp-pointed apical 
tooth which is curved medially and which has a concavity 
on its mesal surface; anterior surface produced medially 
into a narrow blade, the edge of the blade variable but 
usually with one small, stout tooth near the base of the 
apical tooth and with a few denticles on the proximal half. 
Maxillae with the apex paraboloidal ; palp a skewed peg 
with two apical, two subapical and one lateral sensilla; 
galea a frustum with two apical sensilla. Labial palp a 
low rounded elevation with five sensilla; opening of seric- 
teries a short transverse slit (concealed in a groove) . Hypo- 
pharynx with a very few rows of minute spinules. (Material 
studied : numerous larvae from Massachusetts, Michigan 
and North Dakota.) 
Young : Length 2 mm. Similar to the mature larva except 
in the following details: Body curved ventrally. Anchor- 
