462 MAUD D. HAVILAND 
In the living larva the twelfth segment is somewhat telescoped 
into the eleventh, so that only twelve segments appear to be 
present. The mouth parts are produced into a proboscis, 
within which lie two long slender mandibles. The head bears 
three pairs of chitinous nodules on the ventral side, and, in 
addition, a fourth pair dorsally. These processes are each 
furnished at the extremity with a transparent spot which 
TEXT-FIG. 5. TEXT-FIG. 6. 
Fig. 5.—Larva of the first instar. x 150. 
Fig. 6.—Anus and caudal appendage of the newly-hatched larva. 
x 350. a. = anus; S. 9-12 = chitinous plates of segments 9-12. 
is possibly sensory im function. The body-segments diminish 
in diameter from the thorax posteriorly. Hach appears as 
a circular band of chitin, somewhat overlapped by the one 
immediately preceding it. This overlap is so pronounced on 
the ventral side of the thorax in some examples as to give the 
effect of short processes; and as the latter actually appear 
after the first ecdysis it is possible that they may already 
exist under the chitinous plates, but at this stage it 1s not 
possible to demonstrate their presence definitely. The anus, 
which lies dorsal to the cauda, is a large and conspicuous 
structure surrounded by a chitinous ring (‘Text-fig. 6). From the 
