22 BULLETIN 19 9, UNITED STATES NATIONAL MUSEUM 



Plastron incised or indented behind; stridulation organs in males well 

 developed or not; plastron at least sonaewhat smaller, not completely 

 closing shell even in adults 7 



2. Carapace tricarinate; axillary and inguinal scutes (if present) widely 



separated 3 



Carapace flat or unicarinate; axillary and inguinal scutes narrowly in 

 contact or narrowly separated 5 



3. Axillary scute usually absent; posterior edge of abdominals convex. 



abaxillare (p. 22) 

 Axillary scute present; posterior edge of abdominals straight 4 



4. Anterior lobe of plastron longer than immovable portion of plastron. 



cruentatum cruentatum (p. 23) 

 Anterior lobe of plastron as long as or shorter than immovable portion of 

 plastron cruentatum censors (p. 24) 



5. Anterior lobe of plastron longer than fixed portion 6 



Anterior lobe of plastron not longer than fixed portion acutum (p. 23) 



6. Gular more than half length of anterior lobe of plastron. .creaseri (p. 23) 

 Gular less than haK length of anterior lobe of plastron, .leucostomum (p. 25) 



7. Carapace tricarinate; stridulation organs absent; plastron slightly smaller 



than opening of carapace integrum (p. 25) 



Carapace flat or unicarinate; stridulation organs well developed in males; 

 plastron distinctly smaller than opening of carapace 8 



8. Ninth marginal about as high as tenth, much higher than eighth 9 



Ninth marginal much lower than tenth, about height of eighth 10 



9. Gular more than half length of anterior lobe of plastron (60-64 percent); 



length of anterior lobe less than combined length of gular plus length 

 of interfemoral suture plus width of nuchal (83-93 percent). 



flavescens stejnegeri (p. 24) 

 Gular half or less than half length of anterior lobe of plastron (30-50 percent) ; 

 length of anterior lobe greater than combined length of gular plus length 

 of interfemoral suture plus width of nuchal (128-196 percent). 



fiavescens flavescens (p. 24) 



10. Anterior vertebral very narrow, widely separated from second marginal 



on each side; gular less than half length of anterior lobe; posterior marginal 



(eleventh) little lower than penultimate (tenth) herrerai (p. 24) 



Anterior vertebral broad, in contact with second marginal on each side; 

 gular variable in length; posterior marginal distinctly lower than penulti- 

 mate 11 



11. Carapace depressed; entire shell twice as broad as deep; head light, dark- 



spotted; sutures between scutes of carapace not distinctly black-bordered, 

 those between plastral scutes not or narrowly marked with brown. 



sonoriense (p. 26) 

 Carapace peaked, arched as viewed directly from front; shell less than twice 

 as broad as deep; head dark, light-spotted, sutures on carapace narrowly 

 but distinctly black-edged, those on plastron broadly marked with brown. 



hirtipes (p. 25) 



KINOSTERNON ABAXILLARE Baur 



Kinosternon ahaxillare Baur, in Stejneger, Journ. Washington Acad. Sci., vol. 15, 

 1925, pp. 462-463. 



Tyjpe.—U.S.^M. No. 7518; C. H. Berendt collector. 



Type locality. — Tuxtla Gutierrez, Chiapas, Mexico. 



Range. — Plateau of Chiapas. Recorded only from the type locality. 



