44 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



Barbour. The measurements of these bats are essentially the same as those 

 recorded by Miller (Proc. U. S. Nat. Mus., 1903, vol. 26, p. 473) for a series 

 from Simalur Island, near Sumatra. 



Myotis lucifugus (Le Coktb). 



The collection contains a large number of specimens from many localities, in. 

 eluding Bay St. George, Newfoundland; Restigouche, New Brunswick; Oka- 

 nogan and Vernon, British Columbia ; and Salt Lake, Utah. This is the common 

 bat of the limestone caves of Kentucky, Indiana, and other adjoining States, 

 where immense numbers are known to spend the winter. Notwithstanding Mil- 

 ler's statement that "the skull of M. suhulatus does not closely resemble that of 

 M. lucifugus^' it is nevertheless true that specimens- of these two common and 

 nearly related species of eastern and central North America are sometimes diffi- 

 cult to distinguish from each other, especially if unaccompanied by skulls. In 

 addition to the longer ears and longer, more sharply pointed tragus of subulatus, 

 however, I have found a very constant and useful difference in the lengths of the 

 metacarpal bones. In M. lucifugus the third metacarpal is longest, and forms 

 with the fourth and fifth a graduated series. Usually each of the two latter bones 

 is conspicuously shorter than the one preceding it, although in some individuals 

 this difference is- slight. In M. subulatus, however, the gradation is absent in 

 the specimens that I have examined, with but two exceptions : a specimen from 

 an unknown locality, with a slight gradation of the metacarpals ; and a second, 

 locality unknown, in which this feature is more pronounced. It is not unlikely 

 that in case of these two allied species, inhabiting much the same extent of ter- 

 ritory, hybridization should occasionally take place. Three or four specimens in 

 the collection are possibly hybrids between these two species. Thus No. 4423, 

 from Missouri, has a large ear for lucifugus (length from meatus 16 mm., 

 tragus, 7), though somewhat smaller tha^i that of subulatus. The mandibular 

 tooth row measures 7-3 mm., which is practically the same as for subulatus (as 

 against 6-6.6 for lucifugus) ; the metacarpals are, further, intermediate in that 

 the fourth and fifth, though both shorter than the third, are equal. 



Myotis californicus (Audubon and Bachman). 



The presence of this species in Colorado has only recently been established, 

 although I find in the collection a skin with skull from Colorado City, Colo., that 

 was taken August 2, 1871. There is likewise a second specimen labelled " Colo- 

 rado." Two skins were collected in August, 1905, in Chihuahua, Mexico, by the 

 John E. Thayer Expedition. 



Myotis nigricans (Wied). 



A considerable series of this bat from eastern Brazil, the type locality, has 

 made it possible to compare typical specimens with alcohoUcs from Santa Marta, 



