A New Pliocene Antelope from Mexico; with Remarks on Some Known Antilocaprids

Abstract

In the paleontological collections of the California Institute of Technology are remains of a new antelope recently collected with a Pliocene mammalian assemblage (Rincon fauna) in northern Mexico. Through the kindness of Dr. Chester Stock this material has been allocated to the author for description. There are likewise now available specimens of the antilocaprid genera Ilingoceros and Sphenophalos which have remained undescribed. Opportunity is therefore taken in the present paper to make some further observations on these forms, especially with regard to Ilingoceros. Appreciation is expressed to Dr. J. C. Merriam, who originally described and discussed the relationships of Ilingoceros and Sphenophalos, for his continued interest in and support of the research on the fossil Antilocapridae.