970 17. KINOSTERNID# 
ous. Captive specimens ate meat voraciously, under water. 
The Tucson specimens were caught with hook and line baited 
with meat. 
223. Kinosternon flavescens (Agassiz) 
YELLOW-NECKED Mup TurtLe 
Platythyra flavescens Acassiz, Contributions Nat. Hist. U. S., Vol. I, 
1857, p. 430 (part) (type localities, Texas, Arizona), Vol. II, 
pl. V, figs. 12-15. 
Cinosternum flavescens Cope, Bull. U. S. Nat. Mus., No. 1, 1875, p. 52 
(part); Couves, Surv. W. tooth Merid., Vol. V, 1875, p. $90, pl. 
XVII; True, Bull. U. S. Nat. Mus., No. 24, 1883, p. 31 (part); 
Boutencer, Cat. Chelon. Brit. Mus., 1889, p. 40; Cope, Proc. 
Acad. Nat. Sci. Phila., 1893, p. 386; Brown, Proc. Acad. Nat. Sci. 
Phila., 1903, p. 543; SteBENRocK, SB. Akad. Wiss. Wien, Vol. 
CXVI, 1907, p. 568, fig. 6; Dirmars, Reptile Book, 1907, p. 25, 
pl. XI; Srespenrock, Zool. Jahrb., Suppl. 10, Heft 3, 1909, p. 4433 
Strecker, Baylor Bulletin, Vol. XVIII, No. 4, 1915, p. 10. 
Kinosternum flavescens Cope, Proc. Acad. Nat. Sci. Phila., 1892, p. 333. 
Kinosternon flavescens Srone, Proc. Acad. Nat. Sci. Phila., 1903, p. 540; 
Exuis & Henperson, Univ. Colorado Studies, Vol. X, No. 2, 1913, 
p- 114; SrEJNEGER & Barsour, Check List N. Amer. Amph. Rept., 
1917, p. III. 
Description.—Shell rather narrow, elongate, somewhat 
depressed, smooth. Vertebrals five, usually longer than 
broad. Costals four, first longest, second and third highest, 
last smallest. Nuchal narrow. Marginals 11 on each side, 
ninth with superior border much elevated anteriorly, supra- 
caudals not united. Plastron large, extending forward about 
as far as carapace, its central region covered by the abdominal 
plates united to carapace by a strong bridge. Anterior por- 
tion of plastron hinged, capable of closing shell when head 
and limbs are redrawn. Gulars partly or completely united 
into a single plate. Pectoral median suture short. Abdomi- 
nal and anal sutures longest. Axillary and inguinal plates 
elongate, separating abdominal from marginals. Head rather 
