1904.] NATURAL SCIENCES OF PHILADELPHIA. 183 



the family name Mormopidce. Dobson, in his historic catalogue, con- 

 sidered Chilonycteris and Mormops to comprise the group Mormopes, 

 which is coextensive with his subfamily Lobostomince. The same 

 author also describes the peculiar C. psilotis from an unkno\\Ti local- 

 ity. In 1892, Harrison Allen* raised Dobson's Lobostomince to family 

 rank, the Lobostomidoe. In 1902, Miller separated the Mexican type of 

 the rubiginosa group as C.mexicana, and distinguished a Porto Rican 

 representative of the boothi group as portoricensis. While treating 

 the genus Mormoops, the author, in the same year, considered Mor- 

 moops, Chilonycteris and Dermonotus representatives of a subfamily, 

 for which the name Mormoopince was used. 



General Relations. — ^The general relationship of the genus Chilonyc- 

 teris to the other members of the Mormoopince has already been con- 

 sidered.^ Of the species in the genus the boothi and rubiginosa groups 

 present the greatest superficial resemblance to Mormoops, particularly 

 in the broad flattened head and the general form of the chin-lappets; 

 but that these resemblances are not supported by other characters is 

 evident on studying the skulls and structure of the ears and head 

 appendages. On the other hand, the relationship of C. psilotis with 

 Dermonotus is evident from the structure of the skuU, while the rubigi- 

 nosa group is seen to possess a skull having the same general charac- 

 teristics. The arrangement of species in the following portion of this 

 paper is in accordance with the general characters exhibited by the 

 skull, running from the slender arched type of C. macleayii to the 

 heavy short depressed skull of C. psilotis. There are several objections 

 to such an arrangement, but there appears to be no good evidence to 

 support any other classification. Dobson's psilotis is no doubt the 

 most aberrant member of the genus,' and, while in some tooth charac- 

 ters it appears to differ from all the other species, and also from Der- 

 monotus, its position in the genus is easily found by the shape of the 

 skull. Wagner's personata 1 have not seen, and probably it is closer to 

 psilotis than my treatment would lead one to suppose. This point 

 can, of coiu-se, only be settled by the examination of the specimens in 

 the Vienna and Berlin Museums, or by the acquisition of further 

 material. 



Remarks. — Probably the most striking fact noticed on examining a 

 large series of specimens of this genus is the presence of two well- 

 marked color phases, one rufous, the other dark brown. This di- 

 chromatism is evident in every form of which an extensive series is 



*Proc. U. S. Nat. Mus., XV, p. 437. 



5 Proc. Acad. Nat. Sci. Phila., 1902, p. 161. 



