184 MALLOPHAGA EROM BIRDS OF FORMOSA. 
two fine spines. Colour of head pale brownish, with black, distinct ocular 
fleck and blackish brown blotches; occipital margin narrowly edged with 
brown, paler in the middle; mandibles and adjacent regions dark brown. 
Prothorax length 0.15mm. width 0.30mm.; lateral angles blunt, each 
bearing a short spine; posterior lateral margins short, nearly straight, with 
two spines; the posterior margin convex, bearing three strong hairs on each 
side; transverse chitin bar pale but distinct, with the longitudinal bars at 
its ends. Metathorax length 0.2mm., width 0.43mm., with a faint sutural 
line setting off the mesothorax, which has nearly straight posterior margin ; 
sides of metathorax straight, bare, diverging posteriorly ; posterior angles bear- 
ing three spines; posterior margin truncate with a row of spines and_ hairs, 
interrupted at middle. Legs strong, slightly paler than body, with yellowish 
brown dorsal markings. 
Abdomen oval, widest at the fourth segment, and each segment almost 
equal in length; posterior angles of segments projecting a little laterally, 
bearing one or two long hairs and two or three spines on segments I-VIII ; 
the last segment broad, flatly rounded posteriorly, with two long hairs 
on each side and several short, weak hairs between them. Dorsal surface 
of each abdominal segment with a row of hairs of different length on each 
side of posterior margins. Ground colour of abdomen very pale yellowish 
brown, with a brownish transverse band, entirely across each segment. 
Genitalia distinct, of the usual Menopon type, longitudinal bar strong, reaching 
to the fifth abdominal segment and bearing two straight, sharp pointed rods. 
18. Menopon pallescens Nitzsch. 
Giebel, Insecta Epizoa, 1874, p. 293; Piaget, Les Pediculines, 1880, p. 
470, pl. xxxviu, fig. 6; Menopon perdicis, Denny, Monogr. Anopl. Brit., 
1842, p. 225, pl xxi, 19.9: 
One female from Arboricola crudigularis taken on Mt. Arisan, May 14. 
19. Menopon longipectum n. sp. 
(Plate X, fig. 2.) 
One female specimen of this new species was obtained from Arborieola 
crudigularis shot on Mt. Arisan, May 14. 
