1899-] Wortman and Matthew, Ancestry of the Canidce, etc. I 27 



Dept. Ost., Am. Mus. Nat. Hist., on the somewhat uncertain den- 

 tal distinction separating it from N. urostictus. P^ is shorter, 

 canines not so slender, m-j more reduced, mJ- and m-^ seem to be 

 variable in shape. No. 2091 also belongs to this or the preceding 

 species. Locality, Chapada, Matto Grosso, Brazil. 



As another division (Primaevi) of the same genus, distinguished 

 by relatively small brain, short feet, and long lumbar region, we 

 place the three John Day species. 



Nothocyon latidens {Cope). 



Galecynus latidens Cope, Bull. U. S. Geol. Surv. VI, i88r, i8r, ' 

 Cynodictis latidens ScOTT, Trans. Amer. Phil. Soc. 1898, 400. 



Distinguished by exceptionally broad upper molars. Bullae 

 very large. 



Nothocyon lemur {Cope) 



Galecynus lemur Cope, Bull. U. S. Geol. Surv. VI, 1881, i8r. 

 Cynodictis lemur ScOTT, Trans. Amer. Phil. Soc. 1898, 400. 



Molars narrower, cusps marginal, double entoconid on mj, pos- 

 tero-external accessory cusp on m-g doubtful. Bullae very large. 



Nothocyon geismarianus {Cope). 



Canis geisviarianus CoPE, Pal. Bull. No. 30, 1S79, 9. 

 Cynodictis geisi7iarianus Scott, loc. cit. 



Larger species, deuterocone of p^ more reduced than in the 

 others. Bullae of more moderate size. 



The skeleton of this species is fortunately known and has 

 been described by Cope. It stands intermediate between that of 

 Cynodictis gregarius and that of Nothocyon urostictus. The follow- 

 ing comparisons show the advance in the especially progressive 

 characters of (i) length of feet, (2) length of lumbar region, 

 (3) size of brain. 



Cynodictis gregarius, width of carpus, 15 mm. ; length of mc. iii, 22 mm, ; 

 proportion, I : 1.5. 



Nothocyon geismarianus, width of carpus, 16.5 mm. ; length of met. Ill, 

 33 mm. ; proportion, i : 2. 



Nothocyon urostictus, width of carpus, 18 mm. ; length of mc. in, 48 mm. ; 

 proportion, I : 2.7. 



In the saine species we have : 



