﻿VESPERTILIO FUSCUS MIRADORENSIS. 



99 



and miicli larger than 7;>Y>j>/«r/?n^6* and haJiamensis. Yery pallid speci- 

 mens are occasionally taken in tlie Sontliwestern United States, but 

 the number of skins available for comi:»arison is so small that it is 

 impossible to determine the status of the form which these aberrant 

 individuals represent. 



YespertlUo fuscus and V, serotinus have been considered by many 

 writers as races of a circumpolar species. Six specimens of the sero- 

 tine — four from Budapest, Hungary, and two from Berne, Switzerland 

 — kindly -"^ent me by Mr. Oldfield Thomas, of the British Museum, prove 

 conclusively that this view of the relationship of the two animals is 

 untenable. The differences between the American and European forms 

 are so great that, taken in connection with the complete geographic 

 isolation which undoubtedly exists, they leave no doubt of the neces- 

 sity of recognizing each as a distinct species. Yespertilio serotinus is 

 a large and heavily built animal, approached in size by Y. f uscus mira- 

 clorensis alone among the races of Y. fuscus. The adult females from 

 Budapest measure, respectively: Total length, 131 and 131; tail ver- 

 tebrae, 52 and 53; tibia, 22.8 and 22.6; foot, 10 and 11; forearm, 52 

 in each; thumb, 8.1 and 8; longest finger, 93 and 96; ear from 

 meatus, 20 in each; width of ear, 13 and 11; tragus, 9 and 8.6. In 

 addition to its large general size T". serotinus has relatively much larger 

 skull and teeth than any of the races of Y. fuscus (see figs. 21, 25, and 

 26). The skull of an adult female from Budapest (Xo. 1189, Miller coll.) 

 measures: Occipito-nasal length, 21.1; zygomatic breadth, 15; man- 

 dible, 17; upper tooth row (exclusive of incisors), 8; lower tooth row, 

 10. The skull is considerably broader in proportion to its length than 

 in Y. fuscus^ and the audital bulhe are relatively smaller. The teeth 

 are much larger than those of YespertlUo fuscus, and the inner lobes of 

 the upper molars are broader, in this respect approaching Y. fuscus 

 cuhensis. The ui^per inci sors are separated from the canines hy a wider 

 space than in fuscus, and this space subtends a distinct groove on the 

 surface of the premaxilla between the roots of the canine and Incisors. 

 The paroccipital processes are much more strongly develoi)ed in T". 

 serotinus than in any of the races of Y. fuscus. 



VESPERTILIO FUSCUS MIRADORENSIS (H. Allen). 

 1866. ScotophUns miradorensis 11. Allen, Proc. Acad. Nat. Sci., Phila., p. 287. 



Type locality. — Mirador, Vera Cruz, Mexico. Type m the United 

 States ^rational Museum, but now mislaid or lost. 



Geographic distribution. — Costa Eica, Guatemala, and southern Mex- 

 ico. Limits of range not known. 



General characters. — Size larger and color darker than in the more 

 northern form. Feet and distribution of fur as in true fuscus) ears 

 and membranes thinner and more membranaceous. 



Color. — In color Yespertllio fuscus miradorensis RYerB>ges, darker than 

 true fuscus, thus agreeing with the other southern forms, propinqims 

 and cubensis. 



