74 



ARKIV FÖR ZOOLOGI. BAND 14. N.o 4. 



these two species, stränge as it may seem, inhabit practic- 

 allj the same territory N. and NW. of Quito. 



Formerly acoording to Thomas G. fuliginosus bad been 

 collected at Gualea, Ecuador, while C. ohscurus was disco- 

 vered near Bogota, Colombia and then refound by Osgood 

 at the boundary between Colombia and Venezuela, »Paramo 

 de Tama, head of Tachira river.» Its distribution appears 

 tlius to extend along the Cordillera all way southwards to 

 Quito, where it meets C. fuliginosus, which also ascends at 

 east sometimes, to near the »Paramo», as it has been col- 

 lected at an altitude of 12,000 feet. 



Remarks on the alcoholic specimens of Cae7io~ 

 lestes ohscurus: 



The general >hape of the snout resembles that of a Mar- 

 mosa or Phascologole, but the naked portion extends f urther 

 back on top of the snout in Gaenolestes than in the others 

 (Pl. 1 figs. 1 & 2), and the median groove is continued also 

 on the upper parts. Somewhat below the nostrils the naked 

 area is rather suddenly narrowed and only forms brims on 

 either side of the mesial furrow, which brims are continued 

 some distance along the upper lip. 



A very stränge feature presents itself in the peculiar 

 labial flaps which are situated on either side in front of the 

 corner of the mouth one on each lip (Pl. figs. 1 & 2). These 

 flaps are about earshaped, but thin and flat. They areplaced 

 obhquely, but opposite each other, so that when the mouth 

 is completely shut they touch each other. The supralabial 

 flap has its broader end in front nearly opposite the first 

 premolar. The infralabial flap has its broader end posteri- 

 orly^and rising above the börder of the lip. The line of its 

 basal attachment runs then obliquely forwards and down- 

 wards^on Jhe jaw (ef. fig. 1). Both flaps are scantily haired 

 on both sides. 



Their function is probably to increase the capacity of 

 the^opened mouth and to assist in conveying some kind of 

 food into the same. 



The före feet have been described by Thomas, but there 

 are some additions to be m>ade to this. The third finger is 

 longest and the fourth and second subequal, although the 



