:899-] Allen, New Rodents from Colombia and Venezuela. 207 



specimen I refer provisionally to O.f. illectus, though evidently it 

 is not typical. 



In notes on the labels the collector states that in one case the 

 young specimens were found in a nest in a hollow tree, and in 

 the other in a bird's nest. 



Oryzomys sanctaemartae, sp. nov. 



Type, No. 15312, $ ad., Bonda, Santa Marta District, Colombia, June 5, 

 1899 J Coll. H - H. Smith. 



Pelage full, long, and rather coarse. Color above pale yellowish brown, 

 lined with black, through the admixture of many black-tipped hairs ; sides, in- 

 cluding cheeks, paler and grayer ; ventral surface entirely clear whitish gray, 

 the fur plumbeous at base ; ears rather small, pale brown, nearly naked ; tail 

 short, indistinctly bicolor, blackish brown above, a little lighter (in some speci- 

 mens fulvous gray) below, nearly naked, except apically, where the short 

 hairs are more numerous and longer ; feet grayish flesh- color ; hind feet stout 

 and broad, the lateral toes relatively rather shorter than usual in species of 

 Oryzomys. 



Measurements. Type, total length, 229 mm.; tail vertebrae, 100 ; hind foot, 

 24.5 (with claws, 27) ; ear (in dry skin), 15. 



Skull, total length, 31 ; basal length, 24 ; zygomatic width, 16 ; mastoid 

 width, 12 ; interorbital width, 5 ; length of nasals, 13 ; palatal length, 5.2 ; 

 length of palatine foramina, 6.2 ; length of upper tootlirow, 4.4; length of 

 lower jaw (condyle to incisor tips), 20 ; height at condyle, 7 ; height at coro- 

 noid, 8. 



Oryzomys sanctczmarta is based on 8 fully adult specimens 5 

 males and 3 females collected in the low coast district (sea 

 level to 500 feet) near Santa Marta (Santa Marta, i specimen ; 

 Bonda, 4; Mamatoca, 2 ; Masinga Veija, i), April 15 to June 

 12, 1899. They are very uniform in coloration ; a single 'young 

 adult ' female differs from the others in being somewhat darker 

 above. 



This form belongs to the same short-tailed group of the genus 

 as O. brevicauda Allen & Chapman, from Trinidad, and O.phceopus 

 and O. phaopus obscurior Thomas, respectively from Pallatanga, 

 Ecuador, and Concordia, Medellin, Colombia, all these localities 

 being in very different faunal areas from that about Santa Marta. 

 It is, however, much smaller than O. brevicauda, and very differ- 

 ent in coloration, the pale yellowish-brown of the upper parts of 

 O. sanctczmarta contrasting strongly with the rufous brown of 

 O. brevicauda. - On the other hand, O. sanct&marta is evidently 



