ACROBATA. 
337 
near the margin—this latter is pale yellow: the anterior 
part of the fore-arm and region of the wrist, as well as the 
posterior part of the hind leg, are dusky. 
Inches. Lines. 
Length from tip of nose to root of tail . 6 0 
** of tail .. . . . 7 0 
“ of ear ... ... ... . 8 
“ from tip of nose to ear ... ... 1 3£ 
Dr. Muller, in his list of the New Guinea Mammalia, 
includes the Petaurus sciureus. That author has not yet 
described the animal alluded to, and I cannot help thinking 
it is more probably the present species, since this is found on 
the north coast of Australia, where, I believe, the P. sciureus 
does not occur. 
Subgenus 3. Acrobat a. 
Acrobata. Desmarest, Mammalogie, Pt. 1, p. 270. 1820. 
Tail moderately long, clothed above and beneath with short ad- 
pressed hairs, and fringed on either side with longer hairs: 
ears moderate, well clothed externally with fine hairs: feet 
with small claws; thumb of hind foot large; flank mem¬ 
brane scarcely extending to the wrist. Dental formula:—inci¬ 
sors, ~ ; canines, ^ ; premolars, ^; true molars, ^ = 36. 
The anterior upper pair of incisor teeth in Acrobata are 
considerably larger than the other two pairs, and are much 
expanded at the extremity; the posterior two incisors, on 
either side, are small, and the second is the smallest: the 
canine is a well developed tooth, and is placed close to the 
incisors, and distinctly springs from the superior maxillary 
bone: this tooth is followed, on either side, by three well 
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