EousErius. 23 



find a climax in the Austio-Malayau li. brachyotis : diastema c-p'^ 

 still more reduced, p' deciduous, ears still smaller, size smaller. — 

 (c) li. celebensis : palate and cheek-teeth narrower than usual, fur 

 louf^er and richer, size small, wings proportionately long; probably 

 a modification of the R. amplcxicaudatus type. 



(2) SxENOXiCTEUis* (subg. nov.): — Brain-case strongly deflected ; 

 preraaxillaries never co-ossified ; check-teeth excessively narrow : 

 width of p' about one fifth (in llousettus s. str. about one third) 

 that of palate between fronts of p' ; p^ much larger in bulk 

 than a lower incisor; wings from second toe; antitragal lobe 

 obsolete; fur long and rather coarse. Etliiopian. One species: 

 R. lanosns, Thos. — So far as the reduction of the cheek-teeth is 

 concerned, this peculiar species stands in the same relation to the 

 rest of the genus Rouset/iis as the narrow-toothed species of Pleropus 

 (Ft. sahniger, personatus, woodfordi, sc(i2ndatus) to the normal- 

 toothed Fteropi. If its habits were known, R. lanosus would 

 probably prove to subsist cliiefly on food (juice of fruits) tliat 

 requires little or no mastication. 



(3) LissoNTCTKRis t (subg. nov.) : — Brain-case only slightly 

 deflected ; prcmaxillaries co-ossified in front, even in }'oung adults ; 

 cheek-teeth peculiarly short and broad, subquadrate ; p^ reduced 

 in size, being only subequal to a lower incisor ; wings from second 

 toe ; antitragal lobe distinct ; fur limg and silky. Ethiopian. 

 One species : R. aw/olensis, Boc. — This is the most aberrant species 

 of the genus ; although in all important respects a " Rousettus," it 

 shows, in the small deflection of the bi'ain-case, the shape of the 

 occipital region of the skull, and the outline of the cheek-teeth, 

 leanings towards the genus Epomophorns. 



Rousetius, Gray ; 1821. — Xo description. Type (only species): 

 Pta-opus orpiptiacus, Geoff. The name Ronsctfii.s must have been 

 suppressed or forgotten by Gray ; it does not occur in any of his 

 later jtapers. Revived by Palmer, Proc. Biol. Soc. Wash. xii. p. 112 

 (30 April, 1898). 



Cercopteropus, Burnett ; 1829. — No description. Two species 

 mentioned : C. (e.fjifpliacus and C. amplexicandatus. The former, as 

 being the first-named, may bo fixed as the type. 



XantJunpi/ia, Gray; 1813. — Xo description. Three species, 

 enumerated in the following order: The Xantharpye, Xantharptfia 

 ample.vimndata ; Egyptian Xantharpye, X. wgyptiaca ; The Pale 

 Xantharpye, A", stniminea. Both on the " first species principle " 

 and on the " tautology principle " A'. ampJe.vicaudata must be re- 

 garded as the type of the genus. It should be mentioned that the 

 two examples referred by Gray in this book (List Mamra. B. M. 

 p. 37, 1843) to "X. ample-v'icavdata" are in reality not this 

 species but Dohxonia pnllala ; however, by his reference to Geoffrey's 

 original description and figure of Pteropus atnplexicaiidatus Gray 



* Irevos (narrow), ri'icrfpis (bat) ; in allusion to the I'xcessively narrow 

 molnrs. 



t AiiT(TOf (soft), rvKTfpis ; from the silkv character of the fur. 



