1986] Wheeler & Wheeler — Larvae of Eciton 345 
Figure 1. Eciton burchelli. BI, first instar larva; BII, second instar larva; 
Bill, third instar larva; BIV, head of fourth instar larva; BV, head of fifth instar 
(= mature) larva. Side views, X 38; head in anterior view, X 50. Be, egg nearly ready 
to hatch, X 38. bl-b5, larvae of the five instars in side view to show relative sizes, X 9. 
0.006-0.019 mm long; simple. Labrum feebly bilobed. Otherwise 
similar to first instar larva. 
Third Instar Larva. Length (through spiracles) 1. 5-2.9 mm. 
Spiracles about 0.013 mm in diameter. Integumentary spinules more 
conspicuous and in rows. Body hairs 0.037-0.075 mm long; more 
numerous but largely confined to thorax. Cranium subhexagonal 
and with bulging genae. Head hairs 0.036-0.075 mm long, slender 
and flexuous; some dorsal hairs curved downward and a few ventral 
upward; about 60 present. Labrum with transverse rows of spinules 
on anterior and posterior surfaces on and adjacent to ventral sur- 
face; median sulcus with about 10 sensilla on and near ventral sur- 
face. Mandible with apical tooth slightly curved medially and with 
