+30 3. IGUAh'IDM 



Camp Yuma, about 1 60 miles east of San Diego. The Flat- 

 tailed Horned Toad has since been found in southeastern 

 California, southwestern Arizona, and Sonora. It doubt- 

 less occurs in northeastern Lower California, but as yet has 

 not been collected there. 



In California, it has been secured in Imperial (Colorado 

 Desert, Coyote Well, south end of Salton Sea, Fort Yuma), 

 San Diego (Colorado Desert), Riverside (Mecca, Palm 

 Springs), and San Bernardino (Needles), counties. 



In Arizona, it has been collected on the desert near 

 Yuma, Yuma County. 



Habits. — Specimens were secured on the sand hills east 

 of Yuma. They eat ants. One was found sitting on an 

 ant hill, but not an ant was in sight although a half hour 

 later they were swarming over it. It seemed as though the 

 ants remained under cover in the nest as long as the lizard 

 was watching for them. 



87. Phrynosoma modestum Girard 



Round-tailed Horned Toad 



Plate 38 



Phrynosoma modestum Girard, Stansbury's Exped. Great Salt Lake, 

 1852, pp. 361, 365, pi. VI, figs. 4-8 (type locality, the Rio Grande 

 west of San Antonio, Texas, and between San Antonio and 

 El Paso); Hallowell, Sitgreaves' Exped. Zuiii and Colorado 

 Rivers, 1853, p. 14 J; Cope, Proc. Acad. Nat. Sci. Phila., 1866, 

 302; BocouRT, Miss. Sci. Mex., Rept., 46 livr. 1874, p. 23a; Cope, 

 Bull. U. S. Nat. Mus., No. i, 1875, p. 49; Yarrow, Surv. W. looth 

 Merid., Vol. V, 1875, p. 577; Coues, Surv. W. looth Merid., Vol. 

 V, 1875, p. 594; Cope, Proc. Acad. Nat. Sci. Phila., 1883, pp. 10, 

 12; Yarrow, Bull. U. S. Nat. Mus., No. 24, 1883, pp. 11, 64 (part); 

 Cragin, Bull. Washburn Laborat., Vol. I, 1884, p. 6; Gentry, 

 Proc. Acad. Nat. Sci. Phila., 1885, p. 148; Boulenger, Cat. Lizards 

 Brit. Mus., Vol. II, 1885, p. 248; Cope, Proc. Am. Philos. Soc, 

 Vol. XXIII, 1886, p. 282; Cope, Bull. U. S. Nat. Mus., No. 32, 



