12 
W. L. WILLIAMS. 
protuberance for the first pair of legs. The third pair of bris¬ 
tles is located at about the same distance from the body margin 
as the second and almost in a line with the axis of the second 
pair of legs, while the fourth pair is located backwards and out¬ 
wards from the latter, almost midway between the second and 
third pairs of legs ; the fifth pair almost marginal at a point 
equidistant between the third and fourth legs, while the sixth 
pair occurs near the margin, one-third the distance from the 
fourth leg toward the anus. On the ventral surface (Figs, a 
and c) two pairs of hairs are found, one between the epimera of 
the first two pairs, the other between those of the fourth and 
fifth pairs of legs. 
The rostrum (Fig. g) which can be almost wholly retracted 
within the camerostoma is conical with a rounded extremity 
pierced in its centre by a circular opening. The mandibles and 
maxillae are not distinct, but fused together to form a tube end¬ 
ing anteriorly in the circular opening. Dorsally (Fig. U) the 
rostrum offers no markings, while ventrally (Figs, g) there 
is seen a dark line beginning centrally at the base by a sharp 
point gradually widening for one-third the rostral length, where 
it divides into two lines diverging at an acute angle to end on 
either side of the circular opening, at which point it is joined at 
an acute angle by a second similar line extending along the 
margin backward to the base. Within the triangular space 
between the circular opening of the oral tube, and the two first 
mentioned lines is a double tessellated organ of five articles 
apparently representing the maxillary palpi and forming the 
lower lip. No mouth organs capable of biting or penetrating 
tissues are discernible, the parasite feeding by sucking up the 
liquid secretions of the membranes which it infests. 
The legs are of medium length ; large, conical and strong, 
with five distinct articles terminated by a pedunculated retrac¬ 
tile ambulacrum (Figs, e and b) which is cylindrical, ending 
in a campanulated sucker; the anterior two pairs almost margi¬ 
nal ; the first pair directed almost straight forwards, close along¬ 
side the rostrum, bears on the external margin of the trochanter 
