CONSTITUTION AND DEVELOPMENT OF TERMITES. 317 
Fic. 14.—Developing royal substitute form, with fifteen joints; the third 
the shortest, and not pilose. 
Fic. 15.—Exuvie of a developing substitute form. 
Fie. 16.—Outline of the body of a small soldier (the antenne are omitted), 
Fie. 17.—Outlines of the bind angle of (4) the mesonotum and (a) the 
metanotum of a substitute queen, with very slight traces of the wing- 
outgrowths. 3, 4, Kor. 
Fic. 18.—Outline of the right half of the meso- and metanotum of 
developing substitute form. The anterior wing-rudiment is torn off. 
Fic. 19.—Antenna of a small soldier. 3, 4, Kor. 
Fie. 20.—Base of a fifteen-jointed antenna. 3, 4, Kor. 
Fic. 21.—The same in a different stage, but still fifteen-jointed. 
Fic. 22.—The same after development of a sixteenth joint. 
Fie. 23.— Ovary and oviduct of a soldier. 3, 4, Hart. 
Fic, 24.—Posterior leg of a young nymph. 
Fic. 25.—Old substitute queen, with wing-rudiments. 
Fic. 26.—ialf of the thoracic terga, exhibiting wing-rudiments, in a young 
soldier. 3, 5, Hart. 
Termes lucifugus. 
Fic. 27.—Brain of a worker, by transmitted light. 3, 5, Hart. 
Fies. 28 to 33.—Series of horizontal sections of the brain of a young 
nymph, to exhibit the fungiform bodies (interpreted as psychic centres). They 
are represented by the darker and more closely dotted portions (which possess 
small, deeply staining nuclei). 
Fig. 28 represents the most superficial section, and is followed by the 
others in numerical order. 
Fig. 34 represents, by way of comparison, a similar section through the 
brain of Embia, at the point where the fungiform bodies attain the maximum 
dimensions. gl. Retro-cerebral gland. [This gland of unknown function 
exists (only ?) in the nymph of the first form, the perfect insect, and the 
soldier. It eliminates a transparent secretion, which can be spirted out for 
some distance. ] 
PLATE 17. 
Termes lucifugus. 
Fic. 1.—Larva, with eleven joints, the head undifferentiated. 
Fic. 2.—Large-headed larva, with twelve pilose joints. 
Fic. 3.—Small-headed larva. 
Fie, 4,.—Small-headed larva, with fourteen joints, the fourth not pilose. 
