316 B. GRASSI AND A. SANDIAS. 
EXPLANATION OF PLATES 16—20, 
Illustrating Professor B. Grassi’s and Dr. A. Sandias’s paper 
on “The Constitution and Development of the Society of 
Termites: Observations on their Habits ; with Appendices 
on the Parasitic Protozoa of Termitide, and on the 
Embiide.”’ 
The first number after the explanation of each figure indicates the ocular, 
the second the objective of the microscope employed. Kor. = Koritska 
microscope, withthe tube in. Hart. = Hartnack microscope, with the tube in. 
T. = Termes lucifugus. C. = Calotermes flavicollis. 
Instead of the expression that a given individual possesses, e.g. seventeen, 
antenual joints, the abbreviation ‘‘ with seventeen joints” is employed. 
PLATE 16. 
Calotermes flavicollis. 
Fic. 1.—Small-headed larva, with twelve joints. The third, fourth, and 
fifth indistinct ; the former not pilose; the fifth with short hairs (distinguish- 
able with a higher amplification only). 
Fie. 2.—Large-headed larva, with thirteen joints. The third short, and 
not pilose. 
Fie. 3.—Small-headed larva, with sixteen joints. The third and fourth 
scarcely indicated, and not pilose. Wing-rudiments distinctly present, but 
very short, and visible only with higher amplification. 
Fic. 4.—Nymph, with seventeen joints. The third pilose, the fourth not. 
Fic. 5.—Large soldier. 
Fig. 6.—Perfect insect, with fully developed wings. 
Fie, 7.—True queen, in the fourth year of maturity. 
Fic. 8.—Outline of a true king or queen, in the second year of maturity. 
Fic. 9.—Outline of a true queen, in the third year of maturity. 
Fic. 10.—Outline of a true king, in the fifth year of maturity. 
Fic. 11.—Outline of the abdomen of a true queen, in the fifth year of 
maturity (drawn approximately to the same scale as Fig. 10). 
Fie. 12.—Young substitute queen. 
Fie. 13,—Outline of the abdomen of a substitute queen, in the third year 
of maturity (drawn to the same scale as Fig. 11). 
