b.’ 
, 
Cc. 
PYGATHRIX 31 
a.*_Nuchal patch pale drab gray 
tail darkyugraygsixd solos istanx. P. carbo. 
b.4 Nuchal patch creamy white, 
tail buffyngrayss 2 20/0. a P. sanctorum. 
b.”. , No. ntichal pateh to. sahie.Died cata . P. nubigena. 
Thighs white extending to body. 
a.” Legs below knees grayish white ........ P. dilecta. 
b.” Legs below knees black. 
a6... Forearims bladkveliex tetas)... 2... P. natune. 
b.2 Forearms not black. 
a.4 Nuchal crest broccoli brown. 
a5 No white on chest ........ P. rhionis. 
b.5 With white on chest ........ P. cana. 
b.4 Nuchal crest grayish brown. .P. siamensis. 
Thighs white not extending to _ abated . P. catemana. 
j. General color gray. 
, 
a. 
b.’ 
Hands and feet white. 
di bi Mo white onlieadyet ..ccidwoesexs ich... P. aygula. 
b.” With white on head ............. P. me 
Hands and feet black. 
a. No wihite oth teed «cs ec... a ee P. sabana. | 
b.” With white on head 
a.* Black stripe from eye to ear ...... P. everetti. 
b.2 No black stripe from eye to ear ...... P. hosei. 
c.” White spot on forehead rest of head 
AG sete ee EOE Sek safes « <x Bs P. thomasi. 
k. General color black. 
, 
a.’ Sides of head white. 
a.” Under parts of body rufous ...... P. potenziani. 
b.” Under parts of body black .......... P. frangoisi. 
b.’ Sides of head yellowish white. 
a.” Inner side of thighs white ..... P. cephaloloptera. 
b.” Inner side of thighs not white ....P. c. monticola. 
c. Sides of head yellow tinged with red. 
RE OE ES Fee. a Ce P. johni. 
Bot Sai RRIGES CEA ete. cn BE» td « ahd P. ursina. 
ETT Tt ee | ae ae an oe a P. aurata. 
m. General color speckled white and black. 
, 
da. 
Tooth rows curved. 
4“; 
ges Much: silver. imthe Dlack ¢ ..ci00.0:4» cleo P. cristatus. 
bovLess stlmer in thesblack. 4.06 bjo.o.sieiers i. P. c. pullata. 
