104 



ARKIV FÖR ZOOLOGI. BAND 14. N:0 4. 



The cranial dimensions of the male are recorded in the 

 table, those of the old female may be added here: Greatest 

 mesial length 121; zygomatic breadth 61; Gnathion to tip 

 of postorbital processes 68; gnathion to hindmargin of m 

 60; interorbital breadth 26; postorbital constriction 28 5 

 breadth of brain case 46: length of upper molar series 36^7 

 p^^-m^ 21; breadth across ^^ 21,5; breadth aeross m^ 32 

 distance between m^ and bulla 32,6; transverse diameter of 

 m^ 8,2; of m^ S; oi p^ 7,5 mm. The size of the molariform 

 teeth IS evidently variable in this race, as the female spe- 

 cimen has larger teeth than the male. From the typical 

 form this race from Chaco Austral evidently differs in having 

 a smaller skull with narrower palate. As N. h. cinerascens is 

 to be regarded as a geographio race produced by different 

 climatic conditions, its main difference may consist in its 

 outer appearance, its colour and fur, but by this it may be 

 recognized at the first glance. 



Explaiiation of plate. . 



Fig. 1. Head of Caenolestes. ^/i. 



» 2 



Front view of snout of Caenolestes showing labial flaps -/i 



3. Palmar surface of left hand of Caenolestes. ^/i. 



4. Plantar surface of right hind foot of Caenolestes. ^i. 



o. Right hmd foot of Caenolestes seen from above, 4th and 5th toes 



united. 71. 

 0. Structure of mucosa of stomach in the cardiac portion, c. cardia. 



Tryckt den 7 juni 1921. 

 Uppsala 1921. Almqvist & Wiksells Boktryckeri-A.-B. 



