1987] 
Wheeler & Wheeler — Larvae of Veromessor 
305 
short frayed tip. Labrum feebly bilobed; anterior surface of each 
lobe with a few sensilla near and on ventral surface. Mandible feebly 
sclerotized. Maxillary palp represented by a cluster of 5 sensilla; 
galea a slight elevation with 2 sensilla. Labial palp represented by a 
cluster of 5 sensilla. 
Third Instar. Figure 4. Length (through spiracles) 2. 4-2. 8 mm. 
Similar to second instar except as follows: Body widest at AIII, 
venter nearly straight; dorsal profile long and C-shaped. Spiracles 
about 0.019 mm in diameter. Entire integument with minute spi- 
nules in short arcuate rows. Body hairs very few; on thorax only; 
0.013-0.028 mm long, with very short-bifid tip. Cranium subhex- 
agonal in anterior view; width and length subequal. About 30 head 
hairs; 0.013-0.058 mm long, with short 2- or 3-branched tip. 
Labrum bilobed; each lobe with 2 sensilla on anterior surface; ven- 
tral surface with 3 sensilla on each half; posterior surface with 3 
sensilla near ventral border of each lobe and with a cluster of 3 
sensilla near middle; with small patches of isolated spinules dorsally 
and near middle. Maxilla with round-pointed apex and with a few 
short rows of minute spinules; palp a short frustum with 5 sensilla; 
galea a low rounded knob with 2 sensilla. Labium with small 
patches of spinules dorsally near middle, the spinules isolated or in 
short rows; palp a slightly elevated cluster of 5 sensilla; an isolated 
sensillum between each palp and the opening of the sericteries; the 
latter a short transverse slit. Hypopharynx with a few minute spi- 
nules in short transverse rows. 
Fourth Instar. Figure 5. Length (through spiracles) about 
3.0-4.9 mm. Similar to third instar except as follows: Body hairs 
sparse, generally distributed; 0.013-0.1 mm long; with slightly 
curved shaft and short-frayed tip. About 45 head hairs; 0.012-0.05 
mm long. Posterior surface of labrum with rather coarse spinules, 
isolated or in short rows dorsally. Mandible moderately sclerotized; 
apical tooth long, narrow and sharp-pointed; subapical tooth short- 
er and less pointed. Maxillary palp and galea more elevated. Labial 
palp a low knob with 5 sensilla. Hypopharynx with numerous short 
transverse rows of minute spinules; upper portion with numerous 
short ridges [furrows?] converging into pharynx. 
Fifth Instar (Mature Larva). Figure 6. Length (through spira- 
cles) 4. 3-6. 8 mm. Similar to fourth instar except as follows: Body 
profile pogonomyrmecoid but of two different shapes: (1) stout, 
with All and AIII swollen dorsally; (2) abdomen swollen and sac- 
