166 BULLETIN 43, UNITED STATES NATIONAL MUSEUM. 



is attached to the tip of the third phalanx, tlius the median border of 

 this phalanx is without membrane. The third phalanx is directed 

 obliquely toward the body. The third phalanx of the fourth linger is 

 deflected parallel to the free margin of the membrane of the third inter- 

 space away from the body, and presents a well-defined free inferior 

 border. The third phalanx of the third finger exhibits a distinct cu- 

 taneous flange or hem on the free border. Thus all the terminal pha- 

 lanxes are in part or in whole free from the wing membrane on one 

 border. The tail membrane with an indistinct band extending from 

 the knee inward from knee one-half the way to the tail. The inferior 

 margin presents a well-marked lobe near the tail. 



Variations. — A variety of Nyctinomus from California differs from 

 others examined in the presence of plantar tubercles, and in the large 

 size and good definition of the calcaneal tubercle (pi. xxxii, fig. 5). 

 It is further distinguished by the females exhibiting well-defined spines 

 on the median vertical ridge of the muzzle. In the males these are 

 supplanted by small tubercles, or the ridge is entirely smooth. In 

 four examples, three of which were males, the chin was furnished with 

 two small, symmetrically placed warts. No similar appendages have 

 been noted in the genus. In one female an elongated wedge-shape 

 plate defined the mentum. The si)ecimens were 22 in number; males 

 9, female 18. The females were disposed to be slightly larger than the 

 males, and to possess unusually marked masses of fat in the anterior 

 abdominal wall and at the groin. Should increased knowledge of this 

 variety make it desirable to assign it a distinct name it may be re- 

 garded as Xyciinomiis hrasiliensis calif ornicns. 



The assertion that the ears are disunited is sustained by many ex- 

 aminations. However, in a specimen (No. 0045, Mus. Comp. Zool.) the 

 ears are united by a band 1'"'" high. 



In three specimens fi'om the island of St. Kitts (6019, G020, G021 

 Mus. Comp. Zool.) the tail was free for 9™'" only. 



JSf. 2)i(mih(s, from the Bogas country, Africa, resembles the species last 

 named in the length of the second phalanx of the fourth finger, such 

 length being over twice the length of the corresponding phalanx in 

 other species of the genus examined. One female of this species has 

 been examined from the collections of the Museum of Comparative 

 Zoology. 



The following observations on this species may be of use in study- 

 ing iV. hrasiliensis: The muzzle is without spines. The lips are much 

 bicker than in ^. hrasiliensis; they are wider than the muzzle is high. 

 The few stout bristles on the face are much less conspicuous than in 

 N. hrasiliensis. The ears are united for a height of 4'"'". The keel of 

 the auricle is 5""" long. The ears are rounded without a scallop on 

 posterior border; the fi'ee i)ortion below the head measures 0""". The 

 antitragus is higher than broad and is 4™™ wide at the base. The sides 



