302 B. GRASSI AND A. SANDIAS. 
longer abdominal hairs than those of the nymphs and perfect 
insects; these hairs are generally transverse in direction, 
whereas they point obliquely backwards in the nymphs and 
imagos. 
The number of antennal joints may increase in the adult 
workers, larvee of complementary or substitute forms, and 
perhaps in the soldiers, to the maximum figure stated above. 
The general law laid down for the castes of Calotermes is 
equally applicable to Termes, with the introduction of a slight 
modification, due solely to the existence of the workers, which 
are wanting in Calotermes. 
It will stand thus:—The regular development of 
Termes up to the perfect insect may undergo a devi- 
ation at various periods of life, which leads to the 
formationof workers, of complementary or substitute 
royal forms, or of soldiers; the last passing through 
the stadium of the young worker. The deviation in 
question may take place at various periods. 
As the anatomical structure of Termes is in general agree- 
ment with that of Calotermes, I shall restrict myself to a 
few very brief remarks thereon. 
Turning to the sense-organs, it is noticeable that the soldiers 
of this genus do not possess compound eyes, nor do the larve 
which become sexually mature, until the wing-rudiments begin 
to appear. Consequently the complementary and substitute 
royal forms, which have no trace of wings, are equally desti- 
tute of compound eyes. But these are present and pigmented 
in all the other complementary and substitute forms. The 
pigment is also acquired by the nymph of the first form when 
just about to change to the perfect insect. 
In the nymph of the second form there is a distinct structure 
in the neighbourhood of each compound eye, which I interpret 
as a rudimentary pigmentless ocellus. This may also be easily 
seen in nymphs ready for the final change and in the perfect 
insect; but I have been unable definitely to find it in sub- 
stitute forms (I have not looked for it in sections). 
