MAMMALS OP THE MEXICAN BOUNDARY. 



309 



Sfeasaremenls of 53 specimens of the Ammospermophilus hamsii group — Continued. 



a Mammse, five pairs. 

 <> Type. 



c Contained six large fetuses; preserved in alcohol, 

 preserved in alcohol. 



No. 61527, U.S.N. M., body with six fetuses; 



Genus CALLOSPERMOPHILUS Merriam (1897). 



Callosptrmophilus Merriam, Proc. Biol. Soc. Washington, XI, p. 189, July 1, 

 1897, footnote ("and lateralis is the type of a very distinct subgenus of Sper- 

 mophilus, which I here name Callospermophilus"); XIV, p. 126, July 19, 

 1901; Proc. Washington Acad. Sci., Ill, p. 563, Nov. 29, 1901.— Miller and 

 Rehn, Proc. Bost. Soc. Nat. Hist., XXX, No. 1, Dec. 27, 1901, p. 46, foot- 

 note (Syst. Results Study N. Am. Mam. to close of 1900); XXXI, Aug. 27, 

 1903, p. 75 (Syst. Results Study N. Am. Mam. during the years 1901 and 

 1902).— Elliot, Field Col. Mus., Zool. Ser., II, 1901, p. 82, fig. 17 (skull of 

 type); IV, 1904, p. 147 (Mam. Mid. Am.). 



(Maracters.^— Body with three longitudinal stripes (one whitish and 

 two black) on each side; a golden mantle over head and shoulders; 

 mammse, 5 pairs (in one specimen of O. lateralis, 4 pairs); tail cylin- 

 drical, hairy; external ears developed to a degree intermediate between 

 those of Ammospermophilus and Eutamias; skull very similar to that 

 of Citellus citellus (Linnseus), much broader than in AmmospermopMlus 

 or Eutamias, with relatively shorter rostrum, broader nasals, longer 

 interptery gold fossa, and broader basioccipital; skull highest opposite 

 tips of postorbital processes; first premolar smaller than in O. citellus, 

 but relatively larger than in Ammospermophilus or Eutamias. 



CALLOSPERMOPHILUS LATERALIS (Say). 

 SAY GROUND-SaiTIKREL, 



Sciurus lateralis Say, Long's Expedition to the Rocky Mountains, II, 1823, p. 46. 



(original description). 

 Arclomys [SpermopUlus) lateralis, Richardson, Zool. Journ., Ill, April, 1828, 



p. 519; Fauna Boreali-Americana, I, 1829, p. 174, pi. xiii. 



