684 PROCHEDINGS OF THE NATIONAL MUSEUM. ~ vou. xxxtv. 
horn-core is relatively heavier, is angular in front, and its superior 
border approaches much nearer the median frontal suture than in B. 
bombifrons. In addition, characteristic rugosites and markings on the 
frontals indicate that the horn-covering extended much beyond the 
horn-core base, nearly or quite meeting the one from the opposite side 
in the median ne. In B. bombifrons the inter-horn space was ap- 
parently covered by a wide skin-band as in Bos. The horn characters 
seem sufficiently different to separate these species generically, but 
the other cranial characters denote generic relationship. Moreover 
it is possible that the extreme difference in type of horn-core may be 
due in part at least to difference in sex. 
NOTES ON THE RELATIONSHIPS OF THE GENUS BOOTHERIUM LEIDY. 
The genus Bodtherium has for some time been considered as closely 
allied to Owibos, and by some authorities as synonymous with that 
genus. Butin 1905 Mr. W. H. Osgood ¢ re-defined Bodtherium, select- 
ing B. bombifrons as the type, and transferred the remaining species, 
B. cavifrons, to a new genus, Scaphoceros,’ of which S. tyrrelli is 
the type. In the publication first cited Mr. Jsgood has shown with 
good reason the untenability of the opinion held by Riitimeyer and 
others regarding the types of BL. bombifrons and Ovibos [Symbos| 
cavifrons, Which they considered the female and male, respectively, 
of the same, or closely related, species. He has also pointed out that 
the type of B. bombifrons does not represent an immature male, but 
a fully adult individual. By an analogy similar to that employed by 
Osgood it is equally clear that the type of B. sargenti can not be re- 
ferred on these grounds to any species of Ovibos or Symbos. The 
validity of the genus Bodtherium therefore seems to be well estab- 
lished. 
The separation of the two species originally referred to this genus 
permits the study of its relationships in a new light. As now known 
the genus presents quite as many bovine as ovibovine characters, and 
if referable to the Ovibovine it is far removed from the other known 
genera of the group. From present evidence it seems probable that 
the finding of more complete material will show that, whether gener- 
ically distinct from each other or not, the species B. bombifrons and 
B. sargenti represent a distinct group, or subfamily, of the Bovide. 
To this group may belong also the genus Lissops Gidley.© Since, how- 
ever, so little is known of the species of the group as a whole, owing to 
the lack of good material, it would be unwarrantable to separate 
them at present from the Ovibovine. 
@ Smithsonian Miscell. Coll., (Quart.) XLVIII, Pt. 2, July, 1905, pp. 181-182. 
oMr. Osgood later substituted the name Symbos to replace Scaphoceros, 
‘preoccupied. Proc. Biol. Soc., Washington, XVIII, 1905, p. 226. 
eThis genus at present is represented by only the type-species which was 
founded on the posterior portion of a skull. 
