x.D,4 Baker: Two Amphipoda of Luzon 253 



c\ Antennae I with flagellum (8-jointed) longer than peduncle; uropod 

 I, outer ramus without marginal spine; telson slightly notched 



at tip P. sylvicola (Dana). 



c'. Antennae I with flagellum (3- to 4-jointed) distinctly shorter than 



peduncle; telson entire at tip. 



tP. Antennae I with flagellum 3-jointed; antennae II not as long as 



head and first three segments of pereion together, joints (14) 



of flagellum thick; uropod I, outer ramus without marginal 



spines, the rami longer than peduncle; lower lip deeply simply 



lobed P. lagunae sp. nov. 



d'. Antenna I with flagellum 4-jointed; antennae II surpassing pe- 

 reion, joints (18) of flagellum slender; uropod I, outer ramus 

 with marginal spines, the rami shorter than peduncle; lowei 

 lip very shallowly lobed and with rudiments of inner lobes. 



P. luzonensis sp. nov 



Parorchestia luzonensis sp. nov. 



Color pale olive-green; eyes large, round, black. Side plates 

 subuniform, with lower margins in line. 



Antenna I (Plate I, fig. 7) with third joint of peduncle about 

 same length as second ; flagellum shorter than peduncular joints 

 2 and 3 together, 4-jointed, the third joint longest. Antenna 

 II (Plate I, fig. 8) surpassing the pereion, third joint of peduncle 

 longer than first two together; flagellum about once and a half 

 the length of peduncle, about 18-jointed, the joints slender. 

 Maxilla I (Plate I, fig. 11) with inner plate about three fourths 

 the length of outer plate, narrowly rounded at tip, with an inner 

 terminal fringe of soft hairs; outer plate with about six long, 

 curved teeth, the surface of which is denticulated; palp with a 

 tuft of spines at tip. Maxilla II (Plate I, fig. 5) with inner 

 plate acute. Lower lip (Plate I, fig. 6) shallowly lobed and 

 with rudimentary inner lobes. Gnathopod I in 9 (Plate II, fig. 

 3) with joints 5 and 6 subequal in length, the sixth with an inner, 

 terminal, rectangular laminate epiphysis, which the small finger 

 does not nearly equal. Gnathopod II (Plate II, fig. 1) in ? 

 with joint 5 very slightly shorter than 6, joint 6 nearly three 

 times as long as wide and with three tufts of spinules on outer 

 margin ; the finger equals the oblique palm. Pereiopod 5 but 

 little longer than 4, but both 4 and 5 much longer than 3. 

 Pleopods not half the size of those of P. lagunsB, but otherwise 

 normal. Uropods I and II (Plate II, fig. 4) with ramus joint 

 small and with two terminal spines, the peduncle much longer 

 than broad. Telson (Plate II, fig. 5) narrowly rounded at tip, 

 entire, and with few weak spines. 



Length, 8-9 mm, 



Luzon, Laguna Province, summit of Mount Maquiling, in 

 the extinct crater, under stones. This locality is in the dripping 



