94 
Psyche 
[June 
surface spinulose, the spinules in transverse rows which 
form a subreticulate pattern ; on the ventral surface of each 
lateral lobe a pair of sensillse near the center and a cluster 
of four sensillse near the anterior border at the junction with 
the median lobe. Mandibles (PL VII, Fig. 6) very small and 
without teeth; base subtriangular ; apex slender and bent 
medially at an angle to the base. Maxillse prominent, fused 
to the labium; proximal sense-organ (PL VII, Fig. 5) a 
slightly raised cluster of five sensillse, three of which bear 
one spinule each; distal sense-organ (PL VII, Fig. 4) a 
short projection with two apical sensillse, each bearing a 
spinule. Labuim prominent, a few fine ridges forming a 
narrow reticulate pattern posterior to the opening of the 
sericteries; labial sense-organ a slightly raised cluster of 
five sensillse, three of which bear one spinule each. Hypo- 
pharynx (PL VII, Fig. 7) broad and furnished with longi- 
tudinal ridges. 
Immature Sexual (?) Larva (PL VIII, Fig. 6) : Differs 
from the mature worker larva of the same size in being 
stouter and in having the abdomen enlarged at the middle, 
so that the dorsal profile is more convex. 
Sexual Larva (PL VIII, Fig. 4) : Voluminous and plump, 
much larger than the mature worker larva (PL VIII, Figs. 
7A and B) ; hypocephalic ; bean-shaped, somewhat curved 
ventrally; dorsal profile strongly convex; ventral profile 
concave anteriorly, slightly convex posteriorly; diameter 
greatest at the middle, decreasing slightly towards the ends 
which are rounded. Anus subterminal, with small lips. 
Metamerism indistinct. Spiracles, 10 pairs. 
Body mostly naked, but with a few hairs of four types, 
each type restricted to a small area. Type I hairs: Ex- 
tremely long (0.4-0. 6 mm.) ; base stout, straight, and heav- 
ily sclerotized; attenuating rather rapidly to a fine apical 
portion, which is slightly curved forward ; distal % serrate ; 
restricted to the posterior % of the ventral surface and ar- 
ranged in 4 longitudinal rows, 5 to 8 in each outer row and 
4 to 6 in each inner row (PL VIII, Fig. 5) . Type II hairs : A 
few (about 10) moderately long (0.17-0.25 mm.) slender 
hairs, which have the apical half serrate; these are re- 
stricted to a small area at the posterior end and are strongly 
