2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 98 



Distribution. — Hood Island, Galapagos Islands. 



Specimen. — U.S.N.M. Helm. Coll. no. 43409 (type; fig. 1). 



The genus to which the new species is assigned was proposed by 

 Travassos (1916, Brazil-Med., vol. 30, pp. 257-258) for two dicro- 

 eliids, Dicrocoelium infidum Faria, 1910, and Lnfidum similis Travas- 



Fig. 1. — Infidum luckeri, new species. 



sos, 1916, from Brazilian snakes. Infidum luckeri is the third species 

 to be assigned to the genus. The three species may be separated by the 

 following key : 



1. Vitellaria extending anteriorly to level of genital pore or beyond 



/. infidum (Faria) 



Vitellaria extending anteriorly only as far as level of anterior margin of 



acetabulum 2 



2. Distance from tip of intestine to level of vitelline zone about equal to length 



of vitellaria /. similis Travassos 



Distance from tip of intestine to level of vitelline zone much shorter than 

 length of vitellaria /. luckeri, n. sp. 



