PATAGONIAN EXPEDITIONS I ZOOLOGY. 



EXPLANATION OF PLATE VIII. 



Ctenomys sericeus and Ctenomys colburni. 



PAGE 



Fig. i-i. Ctenomys sericeus: Skull, 9 ad., X |. Mayer Basin, upper 



Rio Chico, Patagonia. U. S. Nat. Mus. No. 84,195 . . 40 



Fig. 2-2(5. Ctenomys sericeus: Skull, c? ad., X {. Mayer Basin, upper 

 Rio Chico, Patagonia. U. S. Nat. Mus. No. 84,189. 



Fig. 3-3^. Ctenomys colburni : Skull, 9 ad., X i Basalt Cations, Pata- 

 gonia. No. 78, Colburn Collection 43 



Fig. 4-43. Ctenomys colburni : Type skull, d^ ad., X {. Basalt Canons, 

 Patagonia. No. 147, Colburn Collection. 



(vol. hi) 



