ALLEN: NOTES ON CHIROPTERA. 



59 



at hand does not warrant their separation. Of the specimens whose measure- 

 ments follow, the first is a skin, loaned by the U. S. National Museum. 



MEASUREMENTS OF MOLOSSUS OBSCURUS. 



The skull of No. 3063, from Brazil, measures: greatest length, 19; basal 

 length, 15 ; palatal length, 7 ; interorbital constriction, 4 ; zygomatic breadth, 

 11.2; mastoid breadth, 11; mandible, 13; maxillary tooth row (exclusive of in- 

 cisors), 6.7 ; mandibular tooth row (exclusive of incisors), 7.5. The development 

 of the sagittal crest is subject to considerable individual variation, and in some 

 specimens is hardly noticeable. From the above measurements it is seen that 

 Tiiomas's M. obscurus currentium from Goya, Argentina, is not different from 

 what is here considered typical obscurus of eastern and northern South America. 

 The range of this bat appears to be wide, but tlie status of the various local forms 

 hitherto described seems as yet largely uncertain. 



Molossus crassicaudatus E. Geoffrot. 



This is certainly a distinct species, and not a race of M. obscurus as liitherto 

 supposed. The Museum collection contains specimens from Brazil, Ecuador, 

 Panama, and the Lesser Antilles, and I have examined skins from the type local- 

 ity, Paraguay. Its range seems nearly coextensive with that of J/, obscurus. 

 Thomas (Ann. Mag. Nat. Hist., 1901, ser. 7, vol. 8, p. 437) restricted the name 

 crassicaudatus to the small Molossus of Paraguay and northern Argentine, and 



