PSEUDOGORILLA 225 
PSEUDOGORILLA MAYEMA? Alix et Bouvier. 
Gorilla mayema Alix et Bouv., Bull. Soc. Zool. France, 1877, p. 
488 ; Id. Compt. Rend., LXXXV, p. 56; Rothsch., Proc. Zool. 
Soc. Lond., p. 415. 
Type locality. Upper Congo. Locality of type unknown. 
Color. Male, Line on back of orbital ridge buffy; line on sides 
of head in front of ears, cream buff; top of head, nape, hind neck to 
middle of back, dark reddish, darker than burnt umber; rest of back, 
flanks, and hinder parts of thighs iron gray; lower part of chest and 
abdomen, black; sides of head and limbs covered with black hairs 
tipped with whitish or cream buff; hands and feet black; face and 
upper part of chest naked, black. 
Female. Line on back of orbital ridge and one in front of ears, 
buffy ; top of head black tinged with reddish; back and thighs brown- 
ish; sides of head, arms, legs below knees black, hairs tipped with 
cream buff; lower part of chest and abdomen, black; hands and feet 
black; face and upper part of chest naked, black. 
Measurements. Male. Height, 1,350; shoulders to wrist, 300; 
wrist to tip of middle finger, 230. Skull: total length, 220; occipito- 
nasal length, 194; intertemporal width, 73; width of braincase, 107; 
Hensel, 163; zygomatic width, 155; length of nasals, straight, not 
along the curve, 67.3; length of upper canine, 39.6; length of mandible, 
153.5; length of lower tooth row, 79.5; extreme width of orbits, out- 
side bony ridge, 124.7. 
There are three specimens of this remarkable species in the 
Senckenbergian Museum at Frankfort-on-Main, an adult male, an old 
adult female and a baby, and they differ in size and color from all 
known species. They are the only examples I have seen and are 
not represented in any other Museum. The skeleton of the male and 
skull of the female are also in the collection. The teeth of the male 
have the cusps perfect, but those of the female are much worn; the 
braincase is broad and rather long, and no crest, but low ridges from 
outer side of orbits extend to the back of the skull; the lateral occipital 
expansion is very slight. Orbits large with a considerable depression 
behind the ridge; facial region short, and horizontal portion of man- 
dible rather light ; bony palate long and narrow. 
As the group was in a glass case it was not easy to determine the 
shades of color, although the front was opened, reflections from the 
sides interfering somewhat. 
