66 University of California Publications in Zoology {[Vou.9 
GRINNELL, J., and H. W. 
1907. Reptiles of Los Angeles County, California. Throop Institute 
Bull., Pasadena, Calif., no. 35, pp. 1-64. 
HALLOWELL, E. 
1852. Description of new species of reptiles inhabiting North America. 
Proc. Acad. Nat. Sei., Philadelphia, 6, 177-183. 
1858. ‘‘Reptiles’’ in ‘‘Sitgreave’s Expedition down the Colorado and 
Zuni rivers’’ (Washington, Public Printers), pp. 106-147, 
pls. 1-20. 
HARLAN, R. 
1825. Description of two new species of Agama. J. Acad. Nat. Scei., 
Philadelphia, 4, 296-304, pl. 20. 
1829. Genera of North American reptilia, and a synopsis of species. 
Ibid., 6, 2-38. 
Hay, O. P. 
1892. On the ejection of blood from the eyes of horned toads. Smith- 
sonian Inst. Nation. Mus. Proe., 15, 375-378. 
HERNANDEZ, F. 
1790. ‘*Tepajaxin’’ in ‘‘ Histor. Plantarum Novae Hispan. (Matriti), 
Nev. Plant. anim. min. Mex. Hist.,’’ cap. 44, p. 67. 
HorrMann, C. K. 
1890. ‘‘Reptilien’’ in Bronn, Klass. und Ordn. des Thierreichs, vol. 6, 
part ii, pp. 443-1399, 58 pls., 10 text figures. 
HOFFMANN, W. J. 
1879. Moulting of the horned toad. Amer. Nat., 13, 326-327. 
Hovsrook, J. E. 
1842. Holbrook, Herpetology (Philadelphia, Dobson), 2, vi, 142, 20 pls. 
Phrynosoma, pp. 85-106, pls. 11-14. 
Horper, C. F. 
1901. <A eurious means of defense. Sci. Amer., 85, 106. 
1902. Some California lizards. Sei. Amer., 87, 9. 
Hornapay, W. T. 
1904. The American natural history (New York, Scribner), xxv, 449, 
343 figs. in text. Phrynosoma cornuta, p. 336, 1 fig. 
JORDAN, D. 8. 
1888. Manual of vertebrates (ed. 2; Chicago, MeClurg), iii, 375. 
Phrynosoma, p. 208. 
