192 BULLETIN 13, UNITED STATES NATIONAL MUSEUM. 



Upper incisors unicuspidate inner larger and thicker and lower incisors in axis of 

 jaw. First maxillary premolar in angle not visible from without, although cusp of 

 the second premolar is widely separated from that of the canine; the iirst lower 

 premolar much shorter than the second, which considerably exceeds in height the 

 cusps of the molars. 



Measurements. — Head and body, 1".5; tail, 1"; head, 0".5; ear, 0".38; tragus, 0".18; 

 forearm 1".05; pollex, 0".15; third finger, 1".6; lifth linger, 1".2; tibia, 0".4; foot, 

 0".2. 



Spix. — Simiarum et Vespertilioniiin Brasiliensium species novae, 

 1823-'G3; tab. xxxvi, Fig. 8. 



Vespertilio brasiliensis. — Corpore supra et subtus uigro, alis hyaliuis. 



Descriptio. — Corpus exiguum; caput oblougum; rostrum promiuulum, apicesubob- 

 tusum ; auricuhc louguisculio, lauceolatje, versus basin sublargiie, revoluta>, versus 

 angulum oris non excurrentes; tragus integer lanceolatus, auricularum fere longi- 

 tudine ; uares antic:c, revoluta; adlatcra, uti et versus mentum verrucis tubuliformibus 

 munita^; truncus coi'poris supra et subtus niger; membraua alaris et iuterfemoralis 

 pellucida', prior usque ad pollicem pedis large decurens posterior usque ad calca- 

 neum breviusculum et secundum caudam maiorem decurrens ; cauda pede posteriorie 

 longior, apice vix exserto ac libero. 



Lougitudo trunca a rostri apice usque ad caudae initium 1\" , capitis ^", caudte in- 

 volutic 2", libene 1'", humeri 1", radii ultra If ", pollicis f ", digiti indicis 1|", medii 2", 

 minimi 2", femors |", tibia V', plantie 2^'", calcanei 3f"', membrana iuterfemoralis 

 lA", auricularum ultra ^", tragus ultra 2"', latitude occipitis V', auricularum 4:'", in- 

 terscapulas f", alarum exteusarum 10'", membrame iuterfemoralis 1|". 



-M.. 



True, Proceediugs, U. S. National Museum, 1887, 515. 



A note on Vesper ugohcs2}eru8{AUea). — Inhismonographof the bats of North America* 

 Dr. Harrison Allen described, under the name of Scoto2)h>lus hesperus, or the Western 

 Bat, a small bat from southern California. His description was based upon four 

 specimens, two of Avhich (Nos. 5509, 5510, Nat. Mus.) were from Posa Creek, and a 

 third (No. 5406, Nat. Mus.) from Fort Yuma. One of these types (No. 5509), with its 

 skull, is still in the national collection. 



Upon examining the skull of this specimen I find that Dr. Allen has apparently 

 mistaken the character of the superior incisors, in that ho describes them as "of 

 equal length," while in reality the outer pair are only about half as long as the inner 

 pair. Otherwise the skull agrees with Dr. Allen's description, and belongs to the 

 genus Vesperugo of Keyserling and Blasius, and to the subgenus of the same name, 

 as defiued by Dr. Dobson. 



The species appears to be distinct and valid. It is, however, mentioned by Dr. 

 Dobson in liis Catalogue of the Chiropterat only in a footnote, and he is apparently 

 doubtful of its validity. After quoting Dr. Alleu's description, he writes: "The 

 above description agrees very well with a specimen of a bat from the Straits of 

 Juan de Fuca (Vancouver's Island), which is preserved in the collection of the 

 Hassler Museum, near Portsmouth, and which appears to me to be identical with 

 V. abramus." 



At a later date this author described a new species of North American Vesjjeriigo, 

 under the name of V. merriami, basing his description on a single specimen sent him 

 by Dr. C. Hart Merriam. Upon going over this description with Dr. Allen's type 



* Smithsoui-in Misc. Coll., Vol. xi, 1864. tPages 228-229, footnote. 



