346 
Psyche 
[Vol. 93 
medial border erose. Maxilla with apex narrowly paraboloidal and 
bearing rather long spinules in short transverse rows; palp repres- 
ented by a cluster of 8 sensilla; galea a slight elevation with 2 sen- 
silla. Anterior surface of labium with minute spinules in short 
transverse rows. Otherwise similar to second instar larva. 
Fourth Instar Larva. Length (through spiracles) 3.2-7 mm. 
Diameter uniform. Spiracles about 0.019 mm in diameter. Integu- 
ment with minute spinules in transverse rows. Body hairs 0.025-0.15 
mm long; on all somites but most numerous on T1-T3 and AVIII- 
AX. Head hairs 0.025-0.1 mm long; about 100; several ventral hairs 
curved upward. Labrum with lateral borders sinuate. Maxillary 
palp represented by a cluster of 9 sensilla; galea a short sclerotized 
frustum with 2 apical sensilla. Labium with anterior surface bearing 
numerous short transverse rows of spinules; opening of sericteries a 
transverse slit in the bottom of a depression. Otherwise similar to 
third instar larva. 
Mature larva. Length (through spiracles) 5-9.2 mm. Compared 
to E. hamatum in our 1984: 270. 
Material studied: numerous larvae from Trinidad, courtesy of Dr. 
N. A. Weber. 
Eciton hamatum (Fabricius) 
Fig. 2 
Egg. About 0.25 X 0.5 mm. 
First Instar Larva. Length 0. 5-0.9 mm. Head of same diameter 
as Tl; body straight, diameter decreasing posteriorly. Spiracles 
about 0.001 mm in diameter. Entire integument spinulose, the spin- 
ules minute and isolated. No body hairs. Cranium transversely sub- 
elliptical. Antennae above midlength of cranium. No head hairs. 
Labrum cresentic. Mandibles subtriangular, with straight apical 
tooth, feebly sclerotized. Maxilla with broadly paraboloidal apex, 
appearing adnate; palp represented by a cluster of 6-8 sensilla; galea 
represented by 2 sensilla. Labial palp represented by 3 sensilla; 
opening of sericteries very short. 
Second Instar Larva. Length (through spiracles) 1.3- 1.8 mm. 
Body of nearly uniform diameter. Spiracles 0.006 mm in diameter. 
Integument coarsely spinulose, the spinules isolated. Body hairs 
0.006 mm long, simple, few, mostly on venter of TL Cranium trans- 
versely subelliptical. Head hairs about 0.006 mm long, simple, about 
