1908.] DR. KNUD ANDERSEN ON BATS. 221 



case in any sufficiently large series of skulls of any species of 

 At'tibeus, Vampyrojys^ &c. ; but these minute variations are 

 entirely independent of differences in the geographical habitat of 

 the individuals. The straightest tooth-i'ow I have seen is in a 

 skull from Colon (the tjqje locality of U. convexum) and in one 

 from Chiriqui ; the most arcuate in one from Peru, one from Para, 

 and one from Chiiiqui ; the others are, of course, intermediate. 



Uroderma thomasi K. And. 



1906. Uroderma tJiomasi Knud Andersen, Ann. & Mag. N. H. (7) xviii. p. 419 

 (1 Dec. 1906).— Bellavista, Bolivia. 



Diagnosis. — Similar to U. bilobatum, but with noticeably larger 

 skull, longer tooth- rows, and larger ears and nose-leaves. 



U. thomasi and bilobatum. — U. thomasi differs from U. bilobatuin 

 in the following particulars : — 



The skull is precisely of the same shape as in U. bilobatitm, but 

 in every respect larger ; the largest skull (out of 2.3) of U. bilo- 

 batum measures in total length 23 "3 mm., the smallest skull of 

 two U. thomasi 24-7 mm. ; all other dimensions of the skull ai-e 

 correspondingly increased. — In the whole series of U. bilobatum 

 examined the length of the maxillary tooth-row varies between 

 7-8 and 8-5 mm. (average 8-1 mm.), in U. thomasi it measures 

 8-9-9 mm. The ears ai-e not only absolutely, but proportionately 

 larger. The lancet longer and, especially, broader. — For further 

 details see the table, below p. 223. 



U. thomasi is, probably, the Bolivian representative of U. bi- 

 lobatum ; but in all the points referred to above there seems to be 

 a perfectly clear line of separation between the two forms ; the 

 gap between them is not overbridged by any specimen I have 

 seen. 



The distribution of the fur on the limbs and interfemoral is as 

 in U. bilobatum. The colour of the pelage as in the ordinary 

 dark brown " phase " of that .species ; the whitish ear-edgings are 

 very distinct. 



Specimens examined. — Two, with skulls, viz., c? ad., Bellavista, 

 Bolivia, 1400 m., about 15° S., 68° W. (type specimen) ; and J ad., 

 Reyes, Bolivia, about 13° S., 67° W. (presented by Marquis 

 Doria). Both specimens in the collection of the British Museum. 



Range. — As yet known from IS", Bolivia only. 



Enchisthenes K. And. 



1906. JEncMsthenes Knud Andersen, Ann. & Mag. N. H. (7) xviii. p. 419 (1 Dec 

 1906).— Type : Artiheus liarti Thos. 



Diagnosis. — Allied to Artibeus, but median upper incisors 

 simple ; m^ in row, as broad as the hinder margin of m" ; m com- 

 paratively large, equal to about i of m, ; tragus with a pointed 

 projection on the inner margin, near the tip. 



