Ilijtposiilerus armiger anf/ Commersoni Ti/pes, 41 



1. JIi/)j)Osi(lerus Cunnnersoni, GcoffVoy. 



Diagnosis. — Skull (as compared with //. ffif/as) small : 

 antcorhital width D-IO mm.; upper tooth-row ir2-12'.*5. 

 Size moderate: forearm about l}(3-l()(); third metacarpal 

 about 00-()S. 



Haiif/c. — Madu^'ascar aud the opposite part of the continent, 

 nortliwards to liritish East Africa*. 



1 a. H. Commersoni, Geoffroyj typicus. 



Diagnosis ■\. — On an average smaller: forearm about 

 90 mm. ; third metacarpal about 00-Gl. 



The fourth IcaHet is slightly smaller than in any other 

 form. In one skull the upper canine and ;/ are distinctly 

 separated, tlie only instance of this more primitive condition 

 in all the skulls of the Commersoni type examined ; in a 

 second skull of tlic present form these teeth are perfectly in 

 contact. The front face of the upper canines not very 

 deeply furrowed. 



Range. — Madagascar. 



1 h. H. Commersoni marungensis, Noack. 



Diagnosis J. — On an average larger : forearm about 94- 

 100 mm. ; third metacarpal about 66-68. 



The fourth leaflet is slightly more developed than in the 

 ^Madagascar form. Front face of upper canines not deeply 

 furrowed. 



Range. — From Tanganyika and the Mozambique coast 

 northwards to British East Africa. 



2. Hipposiderus thomensis, Bocage. 



Diagnosis §. — Skull and teeth almost quite as in //. Cuvi- 

 rnersoni. Size very small : forearm about 79-82 mm. ; third 

 metacarpal about 55-58. 



* There can scarcely be any doubt that H. Commersoni also occurs on 

 the western side of the Continent. Of seven examples of Ph. Commer- 

 soni froiu Anjzola, in tlie collection of the Lisbon Museum and recorded 

 by Sr. A. F. de JSeabra in .lorn. Sci. Math. &c. Lisboa, ('2) vol. v. no. xx. 

 p. 2ij4 (Dec. 1898), four (/>, c, d, e) are unquestionably 11. (/iifus, whereas 

 the othi'rs (/, (f, h) no doubt are referable to II. Commersoni as defined 

 in the present paper. 



t 2 specimens, with skulls, examined: S (skin), $ (in ale). 



;J 3 specimens examined : 2 (in ale), Zanzibar; 1 (skin). Tana River, 

 British East Africa. 2 skulls (Zanzibar nnd Tana River). 



§ 3 skins, with skulls, examined, from various places in S. Thome. 



