MALLOPHAGA FROM BIRDS OF FORMOSA. 185 
Description of female :—Body length 1.75 mm., width 0.66 mm. Ground 
colour of body very pale brownish, with distinct light pitchy markings on 
head ; abdomen with narrow, brownish, marginal bands. 
Head length 0.29 mm., width 0.45 mm., somewhat triangular in shape ; 
front evenly rounded, with two short hairs at middle and on each side, in 
front of the ocular emargination, five marginal hairs and a few very fine 
prickles; a long and a short hair on the angle in front of each ocular 
emargination which is distinct ; ocular fringe prominent, composed of numer- 
ous stiff hairs; palpi projecting by nearly the whole length of the last seg- 
ment ; temples expanded, margins somewhat angulated in front and behind, 
with four long pustulated hairs and a few short hairs and spines; occipital 
margin concave, straight at middle, with two short and two longer hairs. 
Colour of head very pale brownish ; ocular fleck black, distinct; curved line 
bounding the antennal region pitchy inward, fading into dark brown out- 
wardly ; occipital margin edged with blackish brown, paler in the middle ; 
mandibles pitchy; a brownish spot on the margin, just in front of each palpi. 
Prothorax length 0.17mm., width 0.29mm., with slightly produced, 
blunt, lateral angles, each furnished with a short hair and two spines; 
posterior lateral margins weakly convex, bare; posterior margin. flatly convex, 
with four hairs; transverse and longitudinal chitin bars pale, but distinct. 
Metathorax length 0.25 mm., width 0.45 mm. ; with lateral emarginations and 
sutural line between meso- and metathoracic segments; lateral margins bare, 
diverging posteriorly ; posterior lateral angles with two spines and a short 
hair ; posterior margin weakly convex, with a long and three short marginal 
hairs on each side. Legs somewhat long and slender, concolourous with 
thorax, bearing a few short scattered hairs. 
Abdomen broad, ovate; widening posteriorly to the fifth segment; then 
tapering more rapidly to the end; length of segments almost equal; posterior 
angles projecting, furnished on segments I-vII with two or three spines and 
a long hair; the latter a little apart from the angles; on segment VII 
with two long and two short hairs; the last segment broad, rounded 
posteriorly with two long and a short hair on each side and a fringe of fine 
hairs on the posterior margin; dorsal surface of abdomen with a regular row 
of short hairs of different length on the posterior margin of each segment; 
