PIPISTRELLUS 213 



PIPISTRELLUS NATHUSII Ke3'.serling and Blasius. 



1839. V[espciiilio] naflMsii Keyserling and Blasius, Wiegmann's Archiv 



fiir Naturgesch., 1839, i, p. 320 (Berlin, Germany). 

 1857. Vesperngo nathusli Blasius, Saugethiere Deutschlands, p. 58. 

 1878. Vesperngo abranms Dobson, Catal. Chiropt. Brit. Mus., p. 226 (Part : 



not of Temminck). 

 1900. Pipistrellus nathusii M6hely, Monogr. Chiropt. Hungariae, p. 276. 

 1905. Vesp[eritgo] nathusii var. unicolor Fatio, Arch. Sci. Phys. et Nat., 



Geneve, 4th ser., six, p. 510, May, 1905 (Geneva, Switzerland). 



Type in Geneva Jluseum. 

 1910. Pipistrellus ahramus Trouessart, Faune Mamm. d'Europe, p. 16. 



Type locality. — Berlin, Germany. 



Geographical distribution. — Central and southern Continental 

 Europe ; exact limits of range not known. 



Diagnosis. — Not so small as PipistreUus lApistrellus (forearm, 

 32 to 3-5 mm. ; condylobasal length of .skull, 12 '6 to 13 "4 mm.), 

 which in general it resembles, but : small upper premolar better 

 developed, the greatest diameter of its crown nearly half that of 

 canine ; canines both above and below much more slender, the 

 length of base of lower tooth measured along cingulum slightly 

 more than half length of anterior border ; tragus more slender, 

 its greatest width much less than length of anterior border ; 

 thumb long, its length much greater than width of wrist ; length 

 of fifth finger about 46 mm. ; posterior edge of wing membrane 

 always pale, though never sharply defined white. 



E.dernal characters. — In general and apart from the animal's 

 less diminutive size, the external characters are essentially as in 

 Plj}i.^treUus pipistrellus. Ear larger and broader with more 

 obtuse apex, more evadently concave posterior border, the inner 

 surface of conch more rugose and with about four irregular cross 

 striations behind tragus ; antitragus small but well defined, 

 projecting distinctly beyond border of conch ; tragus about as 

 high as in P. pipistrellus and similarly blunt . at tip, but with 

 posterior border more evidently convex ; posterior basal lobe 

 small, usually le.ss well defined than in P. 2}!pistreUus. Wing 

 larger and relatively broader than in P. pipistrellus, the meta- 

 carpals as in the smaller animal, but fifth finger extending beyond 

 elbow to a distance equal to decidedly more than one-third length 

 of forearm ; thumb less shortened than in the other European 

 members of the genus, its length noticeably greater than width 

 of wrist ; membrane inserted at base of outer toe. Foot, calcar 

 and tail as in P. pipistrellus. 



Fur and colour. — Fur slightly more loose in texture than that 

 of P. jripistrelhis, the individual hairs somewhat longer, those at 

 middle of back about 7 mm. in length. In distribution it shows 

 no peculiarities, though it extends perhaps less widely on dorsal 

 surface of interfemoral membrane. Colour essentially like that 

 of Pipistrellus pipistrellus, though usually distinguishable by a 



