1954] Wheeler and Wheeler — Bosicerotini and Dacetini Ant Larvae 113 
distributed. Of at least two types : (1) denticulate, flexible, 
short (about 0.16 mm), without alveolus and articular 
membrane, probably the more abundant type; (2) den- 
ticulate, slightly curved, moderately long (about 0.25 mm), 
with alveolus and articular membrane. Cranium vaguely 
subhexagonal in anterior view; a third broader than long; 
occipital border impressed at the middle ; genae and clypeus 
numerous subtransverse rows; posterior surface of each 
of which bears a spinule. Head hairs moderately numerous, 
long (0.108-0.26 mm), flexible and denticulate. Labrum 
short (breadth 2.3 times length), trilobed, anterior sur- 
face of each lateral lobe with eleven minute hairs and/or 
sensilla, ventral border of each lateral lobe with two con- 
tiguous sensilla; whole ventral border spinulose; posterior 
surface spinulose, the spinules near the lateral borders 
isolated and rather long, the remainder minute and in 
numerous subtransverse rows; posterior surface of each 
lateral lobe with a cluster of four sensilla. Mandibles 
moderately sclerotized; long and narrow, slightly curved 
medially; apical tooth slender, slightly curved and round 
pointed; two much stouter teeth projecting inward from 
the inner border ; basal % of the inner surface with minute 
spinules in short arcuate subtransverse rows. Maxillae 
large, with a lateral swelling bearing the palp and a para- 
boloidal apex bearing the galea; apex spinulose; palp 
digitiform with four apical sensilla (two encapsulated and 
two with a spinule each) ; galea digitiform with two apical 
sensilla. Labium large, with all surfaces spinulose, the 
spinules in short subtransverse rows; palp a low knob 
with five apical sensilla (two encapsulated and three bear- 
ing a spinule each) ; opening of sericteries a transverse 
slit. Hypopharynx spinulose. (Material studied : one dam- 
aged semipupa from “Hamburg Farm”, Costa Rica ; worker 
identified by Dr. W. L. Brown as B. sp. near singularis 
(F. Smith). ) 
Genus Aspididris Weber 
Moderately stout. No neck, but thorax and first two 
abdominal somites strongly curved ventrally. Body hairs 
moderately numerous, denticulate and of two types: (1) 
short and flexible; (2) long, curved or flexible, about a 
