6. PETATJEUS. 151 



Synopsis of the Species. 



I. EXTBKNAL ChABACIEES. 



A. Size large ; lower leg more than 80 millim. ; 



tail more than 400 millim. Underside of 

 heel thickly hairy. ' 



a. Posterior side of hips and legs hroadly 



fringed with black. Belly deep orange . 1. P. amtralis, p. 151. 



B. Size smaller ; lower leg less than 80 millim., 



tail than 360. Underside of heel partly or 

 wholly hairy. 



b. Size larger ; lower leg more than 60, tail 



than 230 millim. Tail very bushy, espe- 

 cially basally, where the hairs exceed 40 

 miUim. in length 2. P. sciureus, p. 163. 



c. Size smaller ; lower leg less than 60 millim. 



and tail than 230 3. P. breviceps, p. 166. 



II. Ceanial Chaeactbes. 



A. Size large ; basal length more than 46 millim. 



Molars i-** more than 7"3 millim. long. 



a. Bullss large, the posterior projecting lower 



than the anterior part 1. P. australis, p. 151. 



B. Size smaller ; basal length less than 46 



millim. Molars less than 7'3 millim. 



b. Size larger ; basal length above 38 millim., 



and molars i-^ above 6'5 millim. 

 a^. Bullae large, with a prominent projec- 

 tion anteriorly .^ 2. P. sciureus, p. 153. 



e. Size smaller ; basal length below 38, and 

 molars i-3 below 6-5 millim. 

 ¥. Bullae variable, large in typical, small 



in Papuan variety 3. P. breviceps, p. 156. 



1. Fetaurus australis. 



Hepoona Roo, White, Journ. Voy. N. 8. W. p. 288, pi. Ixi. (animal) 



(1790). 

 Petaurus australis, Shaw, Nat. Misc. ii. pi. Ix. (animal) (1791) ; 



Gray, List Mamm. B. M. p. 83 (1843) ; Gieb. 8aug. p. 701 



(1859) ; Gerrard, Cat. Bones Mamm. B. M. p. 120 (1802) ; Schkg. 



Bierent. p. 166 (1872) ; Flow. 8f Oars. Cat,. Ost. Coll. Surg. ii. p. 705 



(1884) ; Thos. Enoycl. Brit. (9) xviii. p. 729 (1885) ; Jent. Cat. 



Ost. Leyd. Mus. p. 316 (1887). 

 Sciurus (Petaurus) australis, Kerr, Linn. An, K. p. 269 (1792). 

 Sciurus novBB-hollandisB, Meyer, Uebers. Zool. Entd. Neuholl. p. 11 



(1793) (in part). 

 Didelphys petaurus, Shaw, Gen. Zool. i. pt. ii. p. 496, pi. cxii. 



(animal) (1800). 

 Ptilotus australis, O. Fisch. Zoogn. iii. p. 513 (1814). 

 Phalangista petaurus, G. Guv. M. A. i. p. 180 (1817) ; ScMnz, Cuv. 



Thierr. i. p. 260 (1821) ; Burm. Lehrb. Naturg. p. 548 (1830) ; 



Wagl. Syst. Amph. Sdug. p. 26 (1830). 

 Petaurus flaviventer, Besm. N. Bict. d'H. N. (2) xxv. p. 403 (1817) ; 



