164 
Larvae of Fleas 
Antennae. 
The antennae are the most prominent appendages of the head ; 
they have the form of long cylinders slightly thinner in the distal one- 
third of their length, bearing a ring of four minute points at the margin 
of the extremity, and a central stiff hair, which does not taper, or only 
slightly. This hair is relatively longer in Ceratophyllus fasciatus than 
in Xenopsylla cheopis, and is proportionally longer in newly hatched 
Fig. 2. Head of larva of Ceratopliyllus fasciatus ( x 110). A, dorsal view of a head with 
the mouth open and the lip well extended ; B, right side of a head with the mouth 
nearly closed. Drawn by camera lucida from unmounted specimens. W. G. R. 
a. antenna ; a.p. papillae around base of antenna ; l. upper Up or labrum ; l.p. labial palp ; 
m. mouth ; m.p. maxillary palp. 
larvae than in larvae of the third instar. The antenna stands upon the 
middle of a flattened dome, like an inverted saucer ; and around the 
posterior half of this elevation is a series of three soft, blunt processes, 
apparently of a sensory function, alternating with three, rarely two, 
