NO. nil. PEOCEEDINGS OF THE NATIONAL MUSEUM. 365 



tlie second whorl wider between the sutures than the third ; surface of 

 tlie shell jjolished, with the incremental lines occasionally and irregu- 

 larly conspicuous; spire short, the suture deep and channeled, but 

 narrow; base slightly attenuated, pillar with its edge thickened, 

 twisted, and slightly reflected; outer lip thin, sharp, nearly straight. 

 Length 22, maximum diameter, 10 mm. 



Found inside of a large Helix at San Cristobal, Chiapas, Mexico, by 

 E. W. ^\^.lson. IS^o. 107309, U.S.:N'.M. 



This species is nearest to S. hocourti, Crosse and Fischer, 1)ut has a 

 more oval form, less pointed and less elevated spire. 



Family SUCCINEID^. 



Genus SUCCINEA, Draparnaud. 

 SUCCINEA LUTEOLA, Gould. 



Specimens of what api)ears to be this species were found sparingly 

 at Lake Palomas in the Mimbres Valley, northern Mexico, near 

 boundary monument Ko. 19, and in the drift of the Santa Cruz Eiver 

 at Tucson, Arizona. It is also abundant at Fort Clark, Texas. 



LIST OF THE EXOWX PULMONATE FAUNA. 



The following list of land mollusks belonging to the Central region 

 includes all that are known to inhabit it south of latitude 42° to the 

 Mexican border. North of about that parallel there are various in- 

 truders, and the Sonoran element of the tauna is excluded by the cli- 

 mate. The region south of the boundary is too iusufiflciently known 

 to take into consideration. Those species Avhich are marked with an 

 asterisk (*) are relatively northern, and not known south of the locality 

 following the name. Those marked with a dagger (t) belong to the 

 mountain tops of the warmer region about the boundary line, and are 

 probably all found south of the line some distance into Sonora and 

 Chihuahua, the border States of Mexico. The northernmost locality 

 of some of them which are npt known north of the boundary follows 

 the name. The fresh-water species, on account of having a diflereut 

 distribution from the land pulmonates, are here omitted; also the bor- 

 der species of Texas and Lower California, which are not known to 

 enter the region indicated. ^ 



Family VITRINID^. 



t Tiirina pfeifferi, Newcoml). Fort Wingate, New Mexico; Jemez Sulpbnr Springs, 



Aslimun, 

 * Vilrina limpida, Gould. Colorado (Ingersoll) ; New Mexico. 



'I am indebted to Dr. V. Sterki for assistance in making up the list of Pupa and 

 Vertigo. 



