59.9,8(67.5) Article IV.--;PRIMATES COLLECTED BY THE AMERICAN MUSEUM CONGO EXPEDITION’ BY J . A . ALL EN^ PLATES LXXIX TO CLXVII. TEXTFIanREs 1 TO 3. AND MAP CONTENTS PAQE Introduction ......................................................... 285 Species and Subspecies. with Their Localities and Number of Specimens from Each Locality .............................................. 286 Localities. with Names of the Species and Subspecies. and Number of Specimens taken at Each Locality ................................. 288 New Generic Names ................................................. 290 New Species. with Its Type Locality ................................. 291 General Summary.................................................... 291 Suborder Lemuroidea ..................................................... 291 Lorisidae............................................................ 291 Nomenclature of Lemurs., ....................................... 291 Lorisinae........................................................ 293 Perodidicus Bennett .......................................... 293 Specific and Subspecific Names Referable to Perodicticus ........ 293 Perodicticus potto faustus Thomas ............................ 293 Arclocebus Gray............................................. 299 Specific Names Referable to Arctocebus....................... 299 Galaginae...................................................... 299 Galago E . Geoffroy.......................................... 299 Specific and Subspecific Names Referable to Galago ............. 300 Galagoides A . Smith.......................................... 302 Specific and Subspecific Names Referable to Galagoides ........ 302 Galagoides demidofli medius (Thomas) .......................... 303 Suborder Anthropoidea ................................................... 306 Lasiopygidae......................................................... 306 Lasiopyginae..................................................... 306 Generic Nomenclature of African Baboons .................... 306 Papio Erxleben ............................................. 307 Specific and Subspecific Names Referable to Papio .............. 308 Mandrillus Ritgen .......................................... 311 1Scientific Results of the Conno Exuedition. Mammalonv . No . 10. *[Dr. Allen died on August 29- 192f. His manuscript dia-not take into account pa ers issued after December 1920. The references have been revised . Only the captions to latea and &urea. and such parts as are set in square brackets and initialed ‘‘ H.L.” were not written By Dr . Allen . The report therefore represents Dr . Allen’s final work. arranged for publication by Herbert Lang. The large and numerous tables of measurements have beap reduced to avera es. minima. maxima. and ratios . The original tables. however. will be. deposited in the filen of the &born Paleontological Library of The American Museum of Natural History. where they will be available to other investigators.-Ed.) 283 284 Bulletin American Museum of Natural History [Vol. XLVII PAGE Specific and Subspecific Names Referable to Mandrillus.......... 311 Comopithecus, new name ................................. Specific and Subspecific Names Referable to Comopithecus ...... 312 Theropithecus I . Geoffroy......... Specific Names Referable to Ther thecus ..................... 313 The Papw cynucephalus Group.......................... Papio doguera tesseUatus Elliot ......................... Papio doguera heuglini Matschie ................................ 320 Cranial Measurements of Papio doguera Group................ 324 Cranial Measurements of Papio anubis...... ............. 325 Cranial Measurements of Papw cynucephalus.................... 326 Cercocebus E . Geoffroy ..................................... 327 Specific and Subspecific Names Referable to Cercocebus ........... 327 Note on Simia sthwps Linnseus ............................. 333 Cercocebus agilis Rivihre ...... ......................... 336 Cercocebus albigena ituricus ............. 341 Cercocebus aterrimus (Oudemans ............. 346 Rhinostigma Elliot .......................................... 348 Rhinostigma hamlyni (Poco ............. 343 Lasiopyga Illiger ........... Specific and Subspecific Names Referable to Lasw Miopithecus I . Geoffroy..................................... 361 Specific and Subspecific Names Referable to Mwpithecus ....... 361 Erythrocebus Trouessart .................................... 362 Specific and Subspecific Names Referable to Erythtocebus....... 362 Recent Revisions of African Guenons ........................ 366 Status of the Generic Name Cercopithecus ...................... 373 Laswpyga brazzs uelensis (Lonnberg) .......................... 380 Lasiopyga l’hesti l’hasti (Sclater) ... ............ 388 Lasiopyga wol$ (Meyer) ........ Lasiopyga pygerythra griseisticta (Elliot) ............. Allenopithecus nigroviridis (Pocock) ........... Erythrocebus patas pyrronotus (Hemprich and Ehrenberg)........ 422 Cranial Measurements of Erythrocebus patas Group ............... 431 Colobinse ...................................................... 431 Colobus Illiger ............... .... ... 43 1 Specific and Subspecific Names Referable to Colobus .......... 435 West Africa (from Senegambia across Upper Guinea, including the Gaboon, but excluding Lower Congo) .... 435 Western Equatorial Africa (Congo Basin and Upper Nile Drainages south of about 5”N.)...................... 437 19251 Allen, Congo CoEbctMn of Primates 285 PAGE East Africa (Abyssinia through East Africa to Nyasaland) . 440 Cobbus tholloni RiviBre.. ...................................... 441 Colobus langi, new species ....... 443 Colobus ellioti Dollman.. Colobus powelli powelli Matschie.. ........................... 445 Colobus powelli brunneus Lonnberg.. ................... Nomenclature of Colobus powelli Group. .............. Colobus abyssinicus ituricus Matschie.. ......... Colobus angolensis coltoni Nomenclature of Colobus abyssinicus and C. angolensis Groups.. 472 Colobus abyssinicus Group.. ................................... 473 Colobus angolensis Group.. ........... Comparative Summary of External Measurements of Forms of Colobus from northeastern Belgi Comparative Summary of Cranial Colobus from northeastern Belgian Congo.. .............. Pongidae. .................................. Pongins. ................................................ PanOken ....................... Specific and Subspecific Names Referable to Pan.. ....... West Africa .......................................... 480 Upper Congo Drainage and Borderlands.. .......... Pan schweinfurthii (Giglioli). ................................ 485 Age and Individual Variation in Chimpanzees. ................... 487 External Characters of Chimpanzees.. ........................ 492 Cranial Characters of Chimpanzees.. .......................... 495 INTRODUCTION [The primates collected by Herbert Lang and James P. Chapin during the American Museum Congo Expedition (1909-1915) number 645 specimens, of which 66 represent the Lemuridae, 549 the Lasiopy- gida, and 30 the Pongida. Among them are 28 forms (25 species and 3 additional subspecies), with one species new to science. There is one new genus; and one new generic name is proposed. There are also 74 skeletons, 23 of them those of chimpanzees, and 8 specimens preserved in alcohol. Previous to the accession of the Lang-Chapin collection the Ameri- can Museum had very little material of West African primates. These representative series from a circumscribed region have added much to our knowledge of the relatively large variation pertaining in primates taken in the same locality. Only of four forms of Colobus can the cranial variation at present be illustrated (Pls. CXII to CLI) ; Pls. CII and CIII show the type skull of the new species Colobus langi; and Text Figs. 1 to 3, drawn by Mrs. H. Ziska, illustrate the new genus, Allenopithecus Lang.-H. L.] 286 Bulletin American Museum of Natural History [Vol. XLVII A very welcome addition are the series of portraits representing most of the primates in the collection; these were made by Herbert Lang in the field, mostly from specimens in the flesh. In addition to the comparative material available in The American Museum of Natural History, important series of primates have been generously loaned by the United States National Museum, through the kindness of Mr. Gerrit S. Miller, Jr., Curator of Mammals, and Mr. Ned Hollister; the Academy of Natural Sciences of Philadelphia, through the courtesy of Dr. Witmer Stone; and the Museum of Comparative Zoology of Harvard University, through the kindness of Mr. Samuel Henshaw, Director, and Dr. Glover M. Allen, Curator of Mammals; to all of whom I am much indebted. I am also grateful to Dr. T.J S. Palmer, author of the ‘Index Generum Mammalium, ’ for verification of references and transcripts from rare volumes not otherwise available. SPECIESAND SUBSPECIES,WITH THEIRLOCALITIES AND NUMBEROF SPECIMENSFROM EACHLOCALITY Speci- Species and Subspecies Localities mens Lemuridre 1. Perodicticus potlo faustus Akenge, 6; Avakubi, 3; Medje, 18; Niangara, 2; Niapu, 6; Rungu, 1; Stanleyville, 1. 37 2. Galagoides demidofii medius Akenge, 1; Avakubi, 2; Medje, 16; Niangara, 7; Niapu, 1; Stanley- ville, 2. 29 Lasiopygidze 3. Papio doguera tessellatus Akenge, 4; Avakubi, 1; Niapu, 2. 7 4. Papio doguera heuglini Aba, 1; Bafuka, 5; Faradje, 2. 8 5. Cercocebus agilis Akenge, 13; Faradje, 2; Niapu, 19; Panga, 1; Penge, 1. 36 6. Cercocebus albigena iluricus Akenge,