448 MANUAL OF PHILIPPINE BIRDS. 
dark plumbeous. A male from Laguna de Bay measures: Length, 122; 
wing, 51; tail, 36; culmen from base, 12. 
Tothn eA Island, Oct 25, 1902. A young bird just able 
to fly, resembles the adult and differs only in ali the under parts 
very much paler yellow. 
This little flycatcher closely resembles the piece of Zosterops in 
habits, but it is less common in occurrence. At times small flocks are 
found feeding in clumps of bamboo or in high mangrove thickets. I 
has a pleasing note by means of which the members of a flock are kept 
together. In its active movements from tree to tree it resembles the 
titmice, but we have never found Gerygone in forest. The type of the 
species was collected in Luzon by Jagor. 
“The Philippine gerygone was common about bamboo clumps in the 
open fields of Luzon. Five males from Luzon average as follows: Wing, 
51; tail, 38; culmen, 12; tarsus, 14; middle toe with claw, 12. Five 
females, wing, 52; tail, 37; culmen, 12; tarsus, 16; middle toe with 
claw, 16. Iris, legs, feet, and nails black; bill black.” (Bourns and 
Worcester MS.) 
410. GERYGONE RHIZOPHORAZE Mearns. 
MANGROVE GERYGONE, 
?Gerygone flaveola GUILLEMARD, Proc. Zool. Soc. (1885), 263. 
Gerygone simplex WoRCESTER and Bourns, Proc. U. 8S. Nat. Mus. (1898), 
20, 563 (part). 
Gerygone rhizophore MEARNS, Proc. Biol. Soc. Wash. (1905), 18, 7; Me- 
GREGOR and WoRcESTER, Hand-List (1906), 72. 
Bongao (Hverett) ; Mindanao (Mearns); Sulu (Guillemard, Bourns and Wor- 
cester). 
“Adult male and female (seven specimens).—Upper parts, including 
entire top and sides of head, ashy brown tinged with olive; upper tail- 
coverts browner; sides of neck yellowish olive; tail-feathers drab, sub- 
terminally and broadly banded with blackish, tipped with drab-gray, 
and with a white spot near the end of the inner web of all [each of] 
the tail-feathers except the innermost pair; wing-coverts like the back; 
quills darker brown and narrowly edged with olive; whole under parts 
straw-yellow except the crissum which is almost white; lining and edge 
of wing yellowish white; thighs mixed straw-color and olive-brown ; inner 
edge of quills whitish. Measurements of male: Wing, 50; tail, 39; cul- 
men, 10.5; tarsus, 16.” (Mearns.) 
A female from Zamboanga is the only example of this species examined 
by me. In this specimen the crown is slightly darker than in specimens 
of G. simplex from Mindoro, Luzon, and Lubang with which I have 
compared it. Unfortunately Mearns does not compare his species with 
G. simplex which is probably its nearest relative. Guillermard records 
a gerygone from Sulu as G. flaveola, and his specimens were, perhaps, 
the same as G. rhizophore. 
