NO. 1101. PROCEEDINGS OF THE NATIONAL MUSEUM. 7 



me that the fiuding of Neiirotrichus, a close ally of Urotrichus, in 

 America is a sufficient basis for regarding all the American moles as 

 importations from tlie Old World. 



As regards the i)Osition of the American moles in the classification 

 employed by l)r. Gill and modified by Dr. Dobson, it may be remarked 

 first that Gomh/Jura is very properly placed in a separate supergenus 

 {Con(lylur(v), as this form is an isolated one, presenting many peculiari- 

 ties not shared by tlie other genera. The supergenus Scalopes, which 

 comprises Scalops and Scapanus, I can not accept, since Scapamis, as 

 here used, includes Parascalops, which I think should be separate. 



Brewer's mole, Parascalojjs, shows considerable affinity with Cojidy- 

 lura in the form of the pelvis, the tymiDauic bones, and the molars, but 

 in most other characters it is, of course, remarkably different. 



I regard Parascalops as bridging over in some degree the gap between 

 the aberrant Condylura and the very closely allied genera Scalops and 

 Scapamts; but, on the other hand, the remark of Flower and Lydekker 

 that Scapamis and Parascalops "have a dentition like Condylura^'''' ^ does 

 not seem to me warranted. 



The American genera of moles may be arranged as follows : 



KEY TO THE GENERA OF AMERICAN MOLES. 



A. Subfamily Talpinpe. — Pterygoid region of sliull inflated; no distinct pterygoid 



fossa. Clavicle short and broad. Carpus with an os falciforme. 



a. Pelvis with two bony bridges connecting the sacral vertebnc with the ischium. 



Tympanic bulhe complete. Molars with a narrow, simple internal 

 basal projection. 

 art. Premolars J. No functional lower canine; lower incisors, two. Second 



and third upper incisors, minute Scalo2)s 



Type: Scalops aquaiicus. 

 hi). Premolars f or f. Lower caniue present ; lower incisors, thxeQ . . Scapanus 

 Type: Scapamis toivnsendi. 



b. Pelvis with no osseous bridges between the sacrum and ischium. Tympanic 



bulliB incomplete. Molars with a wide, trilobed basal projection. 

 cc. Premolars ^, the anterior ones simple and close together. Nostrils sim- 

 ple Parascalops 



Type: Parascalops breweri. 

 dd. Premolars J; the anterior ones spaced, mnlticuspidate and two-rooted. 



Nostrils in a large fringed cutaneous disk Condylura 



Type: Condylura cristata. 



B. Subfamily My galina-. — Pterygoid region of skull not inflated; pterygoid fossa 



more or lesa distinct. Clavicle longer than broad. Carpus without 

 an OS falciforme. 



e e. Front upper incisors broad. Premolars | Neiirotrichus 



Type: Neiiroirichas gibbsii. 



GEOaRAPHICAL DISTRIBUTION OF MOLES.^ 



The distribution of the several species of American moles is of 

 interest from many points of view. Whether the moles are confined 



'Mammals, p. 630. 



-In the preparation of this revision, which has snfl"ered numerous interruptions, 

 I have had the use of several collections besides that of the National Museum. I am 



