MAMMALS FROM SIAM. 41 



suspicioii that his method of measviring the ears of a Cyiiopterus 

 is different from mine, and his measurements, therefore, not 

 directly comparable with those given by me in the new ' Cata- 

 logue of Chiroptera.' If they were, then the four specimens 

 from Koh Chang, though having a cranial rostrum pei-fectly 

 similar to that of C. b. angulatas, would possess ears as long 

 as, or (in three out of four cases) conspicuously longer than, 

 any C. sphinx sphin.v I have seen. It is only natural, I think, 

 that before admitting the existence of such specimens I should 

 like to verify their characters on alcohol material. AIno the 

 ' collector's measurements ' of the ears of the ten C h. brachyotis . 

 are unusually large. 



"In the specimens of brachyotis the forearm measures 58- 

 66 mm. (57-66 : I add everywhere in parentheses, for com- 

 parison, the corresponding measurements taken by me on the 

 large series examined for the 'Catalogue of Chiroptera'), in 

 the four angulatits 66-70 (65-72); ear, collector's measurements, 

 brachyotis '15-5-18' (15-17), angulatus '18-3-21' (16-18); 

 skull, lambda to gnathion, brachyotis 28-5-29'8 (27-30-?), angu- 

 latus 32-33 (30'5-33-2) ; rostrum, orbit to nares, brachyotis 6-7- 

 7-3 (6-7-4), angulatiis I'l-l-^ (6-5-8-2); mandible, brachyotis 

 21-5-22-8 (20-2-22-8), cm^it^a^Ms 24-2-25 (22-8-25-5); maxillary 

 teeth (crowns), brachyotis 9'2-10'4 (8-8-10-4);, angulatus 10-2- 

 10-8(10-2-11-3). 



" If all the fourteen specimens are placed in a row the 

 practised eye will easily pick out the four angulatus, owing to 

 a different, but hardly describable, tinge of the colour of the 

 upper side. If, similarly, the skulls are placed in a row those of 

 angulatus are, of course, distinguishable at a glance by their 

 conspicuously longer size (see measurements above). 



" Of course, if a fonn really does exist, in the nox'th of the 

 Malay Peninsula, in the islands off" S.E. Siam, and possibly some' 

 where else, which possesses the skull of angiclatus*, but the ears 

 o? sphinx f, then an entirely new and unsuspected element is 

 introduced into the genus. But unless and until the existence 

 of such a form is properly established, I should think it rather 

 premature to discuss its probable effect on our arrangement." — • 

 Knucl Andersen. 



[Dr. Andersen's notes seem to call for some i-emark. With 

 i-egard to the measurement I am satisfied that that used by me 

 is the same as his, i, e. ' from orifice ' (to the extreme tip under- 

 stood). It is the only one of the outer external side that can be 

 taken with any oei-tainty and uniformity, and is so obvious that 

 it suggests itself to every collector. The only possible alternative 

 is the length of the inner external side from tip to base on the 

 crown — quite another thing and not to be confounded with the 

 former. 



* Cranial rostrum (orbit to nares) less than one-fourth of skull (lambda to 

 gnathion). 

 f Ears from orifice (18-20'o mm.). 



