184 PROCEEDINGS OF THE ACADEMY OF - [Feb., 



available. The two extremes are sometimes connected by a series of 

 intermediate individuals possessing to a greater or less degree the dull 

 rather purplish-brown of one type and the rich golden rufous or warm 

 red-brown of the other. This dichromatic coloration is also found in 

 Mormoops and Dermonotus. 



Key to the Forms. 



a. — ^^External margin of the ear with a distinct notch at or slightly 

 below the middle. 

 h. — Internal margin of the ear basally thickened and bearing a 

 distinct angulate notch. 

 c. — External margin of the ear abruptly convex at the com- 

 mencement of its lower third forming an acute-angu- 

 late notch; forearm 35-44.5 mm. 

 d. — Forearm less than 43 mm. in length; cutaneous ridge 

 surmoimting the superior margin of the nostrils 

 without a deep median emargination. 

 €. — Length of head, body and tail considerably over 

 56 mm. ; calcaneum not less, usually much 

 more, than 18 mm. in length. 

 /. — Skull rather elongate and slender; greatest 

 zygomatic width usually less than half the 

 total length of the skull ; rostrum and brain- 

 case about equal in length, 



macleayii Gray.* 



ff. — Skull abbreviate; rostrum inflated; greatest 



zygomatic width more than half the total 



length of the skull; rostrum not as long as 



the brain-case, . . m. inflata n. subsp. 



ee. — Length of head, body and tail about 56 mm.; 



calcaneum not over 16 mm. in length, 



m. fuliginosa (Gray). 

 dd. — Forearm 43 mm. or more in length; cutaneous ridge 

 surmounting the superior margin of the nostrils with a 

 deep median emargination, . . m. grisea (Gosse). 

 cc. — External margin of the ear abruptly convex at the com- 

 mencement of its lower third, forming a rectangulate 

 notch; forearm 45.7 mm., . . . personata Wagner. 

 bh. — Internal margin of the ear not basally thickened and without 

 a distinct angulate notch, 

 c. — Nose wdth a comparatively high erect tubercle; tragus 

 apically obtuse-angulate with a large accessory lobe; 

 skull wath the rostrum slender. 

 d. — First low^er premolar in contact with third, the second 

 crowded out of the toothrow on the lingual side; 

 skull with the rostrum high ; foot rather slender, 



parnellii (Gray). 



* The females of this form closely approacli ???. inflata, but the males are quite 

 distinct. 



