550 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



species {ffyhognuthus nuehalis regia). The HyhognnthuH osmerinus Cope, 

 from the Delaware River, I canuot distinguish from the ordinary niichalis. 



The types of Hybngnathus argyrifis Girard from the Upper Missouri 

 Kiver seem to represent a species distinct from H. nuchalis. The mouth 

 is larger, larger even than in H. hayi, its cleft extending nearly to the 

 eye; the jaws are subequal, the lower angular at tip; the suborbitals 

 are broad as in H. hayi. In other respects it agrees essentially with H. 

 nuchalis. 



The types of Hybognatkus eransi Girard are not preserved, but from 

 the description I infer that it is identical with H. nuchalis. 



The small species of the Texan region, to which Girard has given the 



names of Dionda and Algoma may, perhaps, be regarded as generically 



distinct from Hybognatkus^ the pharyngeal teeth being somewhat differ- 

 ent in form. 



Of these species the following appear to be valid: 



Dionda nubila* Forbes. 



Dionda episcopa* Girard := Dionda texensis* Girard = (?) Dionda papalis 

 Girnvd= Dionda argentosa* Girard = (?) Dionda ckrysitis Gira.id=Hybog- 

 nathus Jlavipinnis Cope. 



Dionda serena* Gira.rd=Hybognathiis nigrotceniatus Cope. 



Dionda punctifera Garman. 



Dionda melanops Girard = Dionda couchi* Girard. 



Dionda fluviaiilis Girard. 



Dionda amara* Girard. 



Indiana University, 



December 16, 1884. 



ON THE OCCURRENCE OP LONCHERES ARMATUS, (GEOFP.) WAG- 

 NER, IN THE ISLAND OF MARTINIQUE, WEST INDIES. 



By FREDERICK ^W. TRUE, 



Cwator of the Departvient of Mammala. 



Among the specimens of West Indian animals received from Mr. F. A. 

 Ober in 1878, was a skin (13039) of a large spiny-rat belonging to the 

 genus Loncheres. After a careful comparison with the descriptions of 

 Waterhouse and Burraeister, I am inclined to believe that the specimen 

 should be classed with L. armaius, (Geoff.) Wagner. 



The color of the upper surface of the animal is a mixture of pale 

 naples yellow, black (or deep brown), and rufous. The rufous color 

 becomes strong on the rump and head, and affects the general colora- 

 tion least on the shoulders and upper surfaces of the fore limbs. A 

 hair taken from the middle line of the back near the rump exhibits the 

 following colors : Lower two thirds gray, light at the base, and grow- 



*0f those nominal species marked, with the asterisk (*) the types are now in th« 

 National Museum. 



