326 BULLETIN" 120, UNITED STATES NATIONAL MUSEUM. 



lished because of failure in the stimuli and responses in the pre- 

 sexual and sexual periods. This is, however, a mere guess. The phe- 

 nomena of their host distribution show that they have in the past 

 been able to overcome the bar which hindered their entrance into and 

 establishment in unaccustomed hosts. 



The !genus Zelleriella is reported from — 

 Pelobatidae (2 species of hosts, 2 species of Zelleriella) . 



Scaphiopus couchii {Z. couchii) ; Texas. 



Scaphiojms solitarius {Z. scaphiopodos) ; North Carolina. 

 Hylidae (3 species of hosts, 3 species of ZelleHella) . 



Hyla pulcliella {Z. hylaxena) ; Paraguay. 



Hyla septentrioncdis {Z. [of Hyla septentrionalis] ) ; Bahama 

 Islands. 



Hyla venulosa {Z. venezuelae) ; Venezuela. 

 Bufonidae (IT species of hosts, 14 or 15 species and subspecies of 

 Zelleriella) . 



Bufo arenarum ("Z. antilliensis ") ; Uruguay. 



Bufo cognatus {Z. hirsuia) ; Arizona. 



Bufo coniferus {Z. opisthocarya) ; Nicaragua, Costa Eica. 



Bufo haematiticus {Z. hufoxena) ; Nicaragua. 



Bufo intermedius {Z. intermedia) ; Guanajuato, Mexico. ' 



Bufo lemur (Z. microcarya) ; Porto Rico. 



Bufo marinus (Z. antilliensis) ; Jamaica, Bermuda. 



Bufo inelanostictus \_f'\ {Z. macronucleata) ; "Asia." 



Bufo monxiae {Z. opisthocarya [of Bufo rrvonxiael ) ; southern 

 Mexico. 



Bufo orhignyi ("Z. antilliensis ") ; Uruguay. 



Bufo peltocephalus {Z. [of Bufo peltoceplialus'\ ) ; Cuba. 



Bufo punctatus {Z. [of Bufo punctatus'] ) ; southern California. 



Bufo spinulosus [Z. [of Bufo spinulosus']) ; Brazil, Peru. 



Bufo sternosignatus (Z. [of Bufo stemosignatus'] ) ; southern 

 Mexico. 



Bufo typhonius {Z. opisthocarya [of Bufo typhonius']) \ Pa- 

 nama. 



Bufo valliceps {Z. intermedia cuneata) ; southern Texas. ' 



Bufo looodhousi (Z. [of Bufo woodhousi] ) ; Utah. 

 Leptodactylidae (17 species of hosts, 10 species (?) of Zelleriella) . 



Eleutherodactylus hinghami {Z. hinghami) ; Peru. 



Eleutherodactylus footei {Z. cusconis) ; Peru. 



Leptodactylus alhilahris {Z. lejjtodactyli) ; Porto Rico, southern 

 Mexico. 



Leptodactylus caliginosus {Z. leptodacfyli) ; southern Mexico. 



Leptodactylus gracilis {Z. leptodactyli) ; southern Mexico. 



L^eptodactylus microtis {Z leptodactyli) ; Guatemala. 



