448 ABBOTT’S KILIMA-NJARO MAMMALS—TRUE. 
Dimensions of four skulls of Colobus caudatus compared with those of one skull o, 
Colobus quereza. 
C. caudatus. ; 
“jie, audatus. } 
reza, * * | ; 
Measurements. 21729 | 34789") 54799 | 34788*| 347911 | 54680 | 34679 | 34676 | 34678 | 34677 
5 lvotng! 9 4: lyounglynuneld :| dad. 2 ad. 9 | 2 dm 
adult. Verne Kahe. Vane Kahne Sahé. Kahé./Kahé.|Kahé.|Kahé. 
mm.\| mm. |mm.| mm. | mm. | mm.| mm. | mim. | mm. | mm. — 
Basilar length (Hensel) .......------ 82.0 | 86.4 | 78.4 | 78.0 | 55.2 | 91.4 | 87.0} 81.5 | 74.5 | 74.5 
Length from posterior edge of pal- 
ate to posterior edge of incisive 
GV COs eee aa eee ae eee al 47.5 | 48.2 | 45.2 | 42.8 | 30.0 | 49.0 | 48.0 | 43.5 | 39.5 | 39.9 
Greatest breadth across zygomatic : 
BLOQUOS=a seater eek emer ser 80.0 | 78.9 | 74.2 | 74.6 | 58.2 | 83.0 | 78.0 | 73.3 | 70.0 | 71.0 
Least width between the orbits - - - -- 14.4] 10.0) 9.8 9.6 7.4) 11.0 | 10.0 | 9.0) 8.0 s 
Longest axis of orbits.-.---..------- 26.2 | 27.4 | 27.6 | 27.8 | 22.6 | 26.5 | 26.5 | 26.5 | 25.0 | 26.0) 
Length of nasals in the median line.| 15.6 | 12.8 | 11.0} 12.4] 11.7 | 12.5 | 14.0] 12.0] 10.5 | 110 
Vertical diameter of anterior nares | 21.2 | 25.0 | 23.2 | 22.8} 15.6 | 25.0 | 24.0] 22.0 | 22.7] 20.5 
Transverse diameter of anteriornares} 13.6 | 15.8 | 13.4 | 14.2 9.4 | 16.5 | 14.7] 12.6 | 113] 120 
Length of upper molars and premo- | 
lars taken together. -...--.-..-....- 33.0 | 35.6 | 33.8 | 32.4 | 18.6 | 34.5 | 34.0 | 33.8 | 31.5} 33.0 
Length of lower molars and premolars| 39.6 | 40.0 | 39.4 | 37.6 | 19.4 | 42.0 | 41.0 | 39.5 | 35.0 | 38.0 
Length of crown of superior canine.| 21.4 | .-..-- eS | Se So- e Sec = 21.5 | 23.3 | 12.5 | 13.0} 12.0 
Length from posterior edge of lower 
incisive alveole to posterior mar- : 
gin of condyle of jaw-------------- 77.8 | 79.4 | 70.8 | 73.6] 53.0 | 85.5 | 81.0 | 76.0 | 69.3 | 69.5) 
Depth of jaw below the coronoid i 
TERR) Roesoosouscecusosce pe See tos | 46.8 | 48.0 | 43.0] 45.8 | 31.0 | 52.3 | 50.0 | 49.0 | 44.5 | 46. 
* Suture between basi-occipital and basi-sphenoid open; permanent dentition. { Milk dentition. — 
Cercopithecus albogularis Sykes. 
The three specimens collected by Dr. Abbott correspond to Sykes’s 
and Fraser’s description of C. albogularis, between which and the CO. 
monoides of Is. St. Hilaire there seems to be no essential difference. St. 
Hilaire states that according to the English zodlogists the breast of C. 
albogularis is white. I do not find it so stated, however; the words 
in the original description are: “Chin and throat pure white.”* 
Further, the quotation of the original description of the color of the 
species is not strictly accurate, and although St. Hilaire intimates that_ 
the thumb is longer in his C. monoides, his figure does not indicate that— 
such is the case. 
The largest specimen collected by Dr. Abbott is almost exactly of— 
the same size as the type, if Sykes’s measurements may be relied upon. — 
The only discrepancy in color which I find relates to the hind legs (ex-_ 
cluding the feet). Sykes states that they are “ black, with a little of 
the dorsal color.” In Dr. Abbott’s specimens they are clear gray 
throughout, except at the knee, where there is a black area. This gray 
color arises from the fact that the hairs are black in the upper half, — 
with two rings of white. 
The young specimen (No. 18929) differs somewhat in coloration from — 
the adults, which difference is doubtless due to immaturity. The white — 
area on the throat is prolonged into a silvery gray area on the breast, 
and the general color of the belly is dusky gray rather than blackish, 
and the hairs are but little annulated with white. There is much whitish - 
* Sykes, Proc. Comm. Sci.. Zoél. Soc. London, 1831, p. 106. 
