300 B. GRASSI AND A. SANDITAS. 
B. Soldiers with all antennal joints pilose. De- 
rived from large-headed forms of the preceding stage (11). 
c. Examples without trace of wings and with a 
relatively small head (Pl. 17, fig. 4). Derived from small- 
headed forms of the preceding stage (11). 
p. Examples with very short wing-buds (Pl. 17, 
fig. 6). Also derived from small-headed forms of the preceding 
stage (11). 
IV. Individuals 4 to 6 mm. or more in length, with 
fifteen or sixteen antennal joints. Some possess very 
short or partly developed wing-buds, and belong to 
groups c and p of Stage 11 (Pl. 17, fig. 9). Others have no 
trace of wings, and these may be of three kinds: a”, more 
or less youthful workers; 3B’, soldiers; c*, larve of 
royal forms, complemental or substitutional, with- 
out sign of wings,and with the head small. a? are 
derived from forms a or c of Stage 111; B* from forms 4, 
possibly also from forms B, c, and p of Stage 111; c?, lastly, 
from form c of that stage. 
V. Individuals with seventeen or eighteen anten- 
nal joints, incapable of flight, and infertile, or at 
least far from maturity. 
These may be of five kinds: a°, soldiers (with not more than 
seventeen antennal joints, all pilose) (Pl. 17, fig. 14); B%, 
adult workers (circa 5 mm. in length) (id., fig. 13); c’, 
“nymphs ofthe first form’! (7—8 mm. long), with long 
wing-pads, the genital organs little developed (id., fig. 10) ; 
pb’, “nymphs of the second form”? (4—8 mm. long, 
with more or less short wing-pads, the genital organs well 
developed) (id., figs. 19,20, 22); n3, larve of complementary 
or substitute royal forms, without trace of wings (7— 
9 mm. in length). As will be seen later, the forms p® are also 
larve of royal substitutes. Form a* may originate from a? of 
Stage rv, and perhaps from 8’ as well ; B® is derived from form 
1 [Lespés, ‘ Ann. Sci. Nat.’ (4), v, pp. 248—251, pl. v, fig. 6.] 
2 [Id., pp. 251—254, pl. v, fig. 7.] 
