INTRODUCTION Ixiii 



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459. Pygathrix chrysomelas Vol. Ill, 42 



460. Pygathrix sumatrana " III, 43 



461. Pygathrix batuana " III, 44 



462. Pygathrix percura " III, 44 



463. Pygathrix femoralis " III, 45 



464. Pygathrix melamera " III, 47 



465. Pygathrix barbei " III, 48 



466. Pygathrix holotophrea " III, 49 



467. Pygathrix phayrei " III, 49 



468. Pygathrix flavicauda " III, 50 



469. Pygathrix robinsoni " III, 51 



470. Pygathrix obscura " III, 52 



471. Pygathrix carbo " III, 54 



472. Pygathrix sanctorum " III, 55 



473. Pygathrix nubigena " III, 55 



474. Pygathrix dilecta " III, 56 



475. Pygathrix natun^e " III, 57 



476. Pygathrix rhionis " III, 58 



477. Pygathrix cana " III, 58 



478. Pygathrix siamensis " III, 59 



479. Pygathrix catamana " III, 60 



480. Pygathrix aygula " III, 60 



481. Pygathrix fuscomurina " III, 62 



482. Pygathrix sabana " III, 63 



483. Pygathrix everetti " III, 63 



484. Pygathrix hosei " III, 64 



485. Pygathrix thomasi " III, 65 



486. Pygathrix potenziani " III, 67 



487. Pygathrix franqoisi " III, 68 



Subgenus Presbypithecus. 



488. Pygathrix cephaloloptera Vol. Ill, 68 



489. Pygathrix c. monticola " III, 71 



490. Pygathrix senex " III, 71 



491. Pygathrix johni " III, 72 



492. Pygathrix ursina " III, 74 



Subgenus Trachypithecus. 



493. Pygathrix aurata Vol. Ill, 75 



494. Pygathrix cristata " III, 79 



