1987] Wheeler & Wheeler — Larvae of Veromessor 307 
nute spinules in short to long arcuate rows which are arranged in 
subtransverse rows; opening of sericteries a moderately long trans- 
verse slit. 
Material studied: numerous larvae from Death Valley National 
Monument, California and Boulder City, Nevada. 
In studying the living larvae the following characters will be most 
useful in distinguishing instars: First instar. Lacks hairs on body. 
Head hairs few (about 20). Second Instar. Body hairs very few, 
confined to T1 only. Head hairs few (about 35). Third Instar. Body 
hairs very few, some on each thoracic somite. Fourth Instar. Body 
profile lacks distinct neck. Entire integument covered with spinules 
and hairs, the hairs with short frayed tips. Fifth Instar (Mature 
Larva). Body profile pogonomyrmecoid. Length 4. 3-6. 8 mm. Body 
hairs with short 2- or 3-branched tip. 
Summary 
The larva of each of five instars of Veromessor pergandei is de- 
scribed in detail and illustrated. In the fifth instar there are two types 
of body profiles. The instars of living larvae may be differentiated 
by a few easily observed characters. 
