236 Bulletin American Museum of Natural History. [Vol. XXII, 



35. Molossus sinaloae sp. nov. 



Type, No. 24524, 9 ad., Escuinapa, Sinaloa, Feb. 15, 1904; J. H. Batty. 



Size of M. pretiosus, but very different in the size and form of the ears and in 

 coloration; the braincase is also much narrower and higher and the dentition 

 heavier. 



Above dull dark brown ; below much lighter, approaching grayish brown ; 

 ears and membranes dark brown. Ears small, transverse width across both 

 (in dry skin) 18 mm. against 21 mm. in M. pretiosus; height, 13. 



Measurements. The collector's measurements from the fresh specimen are: 

 Alar expanse, 324; head and body, 70; tail, 38. From skin: forearm, 43; 

 3d finger, ist phalanx, 46; 2d ph., 20; 3d ph., 18; thumb very short, 6; foot, 16 

 Skull: Total length, 20; basal length, 14; zygomatic breadth, 12; width of, 

 braincase, 10; height of sagittal crest, 1.5; mandible, 14; maxillary toothrow 

 (including canine), 7; lower toothrow (including canine), 8. 



Represented only by the type, an old female with worn teeth. 



This species is intermediate in size between M. nigricans and M. 

 obscurus, being much smaller than the former and very much larger 

 than the latter. 



36. Nyctinomus mexicanus Saussure. 

 Eight specimens (in formalin), Escuinapa, July (?). 



37. Pteronotus davyi fulvus (Thomas}. 

 Two specimens (in formalin), Escuinapa, July (?). 



38. Spectrellum mexicanum (Miller}. 

 Two specimens, Escuinapa, July 4 and 9. 



39. Leptonycteris nivalis (Saussure}. 



Eight specimens, Escuinapa, Oct. 6, 7, 22, 29. Four are in the 

 dark phase of coloration and four in the light phase, both sexes 

 being represented in each. Alar expanse, 356-368; length of body. 

 7389; ear, 16. 



40. Glossophaga mutica (Merriam}. 



Twenty-nine specimens, Escuinapa, July 5-18 (18 specimens), 

 Oct. 29 (10 specimens), Jan. 19 (i specimen). 



The collector's measurements of 10 adult (July) specimens are: 

 Alar expanse, 266 (254-276); length, 56 (53-58). Several of the speci- 

 mens are strongly reddish, between which and the dull dusky brown 



