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PROCEEDINGS OF THE NATIONAL MUSEUM. 



standards, pi. 29) mixed with black, the combination of different hues 

 of cinnamon with different admixtures of black giving rise to many 

 degrees of individual variation. These variations tend to group 

 themselves around two extremes, in one of which the general effect 

 is between bister and black, in the other snuff-brown or royal-brown. 

 Direct intermediates between the blackish and rich reddish phases 

 are rare or absent, but the two extremes may be connected by a series 

 of specimens showing gradually paling tints leading to a neutral con- 

 dition which can not be definitely referred to one phase rather than 

 to the other. In extreme neutral specimens the snuff-brown or bister, 

 is reduced to a wash overlying the pale-pinkish-cinnamon under color 

 which everywhere appears conspicuously at surface. Under parts 

 slightly less dark than back, often with a tinge of drab. Membranes 

 (dry) an indefinite dark brown; ears not so dark as membranes. 



Fig. 1.— Dorsal and lateral views of skull: Glossofhaga soricika (n), G. 



LONGIROSTRIS (6), AND G. ELONGATA (c). ALL NATURAL SIZE. 



STcuU. — The general features of the skull (fig. la) are too well known 

 to require special description.^ Variation in size is not conspicuous. 

 Taking the species as a whole the condylobasal length varies .'] mm., 

 or 14.9 per cent of the mean. In each of two of the smaller races, 

 soricina and leachii, the variation is 1.2 mm., or, respectively, 6.2 and 

 5.9 per cent, while in the large Peruvian form it is 1 mm., or 4.7 per 

 cent. The Peruvian animal is not represented by so man}^ specimens 

 as the others. Hence the percentage of variation is probably too low. 

 With sufficient material it may be expected to be about 6 per cent in 

 any race. The breadth of brain case appears to be more variable 

 than the length of skull, though the actual measurements show that 

 such is not the case. In the two small races, soricina and leachii, the 

 extremes are 0.6 and 0.4 mm. apart, or respectively, 6.9 and 4.5 per 

 cent of the mean for each form. In the larger Peruvian animal the 

 variation is the same as in leachii. Referred to the mean condylobasal 



1 See H. Allen, Trans. Amer. Philos. Sou., 

 Gen. Bats, p. 138, June 29, 1907. 



N. S., vol. 19, p. 243, pis. 6 and 



Miller, Fam. and 



