30 



arched form of the head and tlie large eyes produce in these ani- 

 mals a slight reserablance to young rabbits ; their affinity, however, 

 is ■vvith the Mtirida." 



Reithrodon typicus. Reithr. vellere suprd pilis Jlavescejtti-fuscis 

 et niffrescentibus intermixtis composito; regione circa oculos, genis 

 lateribusgue corporis auratis, pilis pallidė fuscis intermixtis ; 

 partibus inferioribus auratis ; rhinario ad latera flavescenti- 

 albo ; auribus magnis, intus pilis Jlavis, extiis Jlavis et fuscis, 

 indutis ; caudd suprd pallidė fuscd, subtiis sordidė albd ; pedi- 

 bus albis. 



unc. lin. 

 Longitudo ab apice rostri usque ad caudse basin 6 O 



ab apice rostri ad marginėm oculi . O 84 



ab apice rostri ad basin auris .... 1 4| 



tarsi digitorumgue 1 2^ 



auris O 8 1 



Latitudo auris O 8^ 



Hab. Maldonado. 



Reithrodon cuniculoides. Reithr. stiprd griseus, flavo-lavatus, 

 pilis nigris ijitermixtis ; abdornine gvldąue pallidė jlavis ; nati- 

 bus albis; pedibus albis; auribus tnediocribus, intiis pilis flavis, 

 extics pilis pallidė Jlavis, obsitis, mactild nigrescente ad mar- 

 ginėm anteriorem positd ; pone aures, nota magnd albescenli- 

 flavd ; caudd corpore breviore, suprd pallidė f uscd, subtūs albd. 



mic. lin. 

 Longitudo ab apice rostri usque ad caudae basin 6 5 



caudcB 3 8|^ 



ab apice rostri ad marginėm oculi . O 9^ 



ab apice rostri ad basin auris ; . . . 1 4 



tarsi digitorumgue 1 4^ 



■ auris O 7 



Hab. Santa Cruz. 



In conclusion, two other new Rodents were characterized under 

 the generic name of 



Abrocoma.* 



Dentes primovęs f acuti, eradicati, anticė laeves : molares utrinąue 

 '\ subseąuales, illis maxillse superioris in areas duas transver- 

 sales ob plicas vitreas acutė indentatas divisis ; plicis utriusque 

 lateris vix seąuė profundis ; illis mandibulse inferioris in tres 

 partes divisis, plicis vitreis bis intemė, semel externė indenta- 

 tis, area prima sagittae cuspidem fingente, cseteris acutė trian- 

 gularibus. 



Artus subseąuales. 



Antipedes 4-dactyli, externo brevissimo, intermediis longissimis et 

 ferė seąualibus. 



* ' A/ipo;, soft; Kof^n, hair. 



