4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 8l 



groups occurring as parasites in vertebrates. The intermediate arthro- 

 pod hosts are Hsted here as completely as possible ; the primary host 

 list is frequently abbreviated to only representatives of groups. 



In the lists arranged on a basis of parasite groups the names of 

 hosts are given as they are found in the literature, regardless of spell- 

 ing, synonymy, recognizable status, or validity. This is to enable the 

 reader to trace the records if desired. In the final lists, arranged on 

 a basis of intermediate host groups, the parasites are listed under the 

 valid names of their arthropod hosts as far as possible. Synonyms of 

 host names are indicated as synonyms, but names which cannot be 

 recognized as valid or synonyms are retained. The insect host names 

 have been checked by Dr. E. A. Chapin and the late Dr. H. G. Dyar 

 of the Federal Bureau of Entomology through the courtesy of Mr. 

 Harold Morrison, Chief of the Division of Taxonomy, and the crus- 

 tacean host names have been checked by Dr. Waldo Schmitt of the 

 U. S. National Museum, and I wish to acknowledge my indebtedness 

 to these workers for their assistance. 



ARTHROPODS AS INTERMEDIATE HOSTS OF CESTODES 



The known number of arthropods acting as intermediate hosts for 

 tapeworms is so small that this subject can be covered rather compre- 

 hensively. At the same time, one must generalize here as elsewhere 

 rather carefully, since we know the life histories of only about i per 

 cent of the known tapeworms. In addition to arthropods, the inter- 

 mediate hosts of tapeworms include mammals, birds, reptiles, am- 

 phibia, fish, mollusks, annelids, and other animals. In all probability 

 many worms now known only as having one intermediate host will be 

 found to require two successive intermediate hosts. The following 

 list will show the tapeworms, their primary hosts, and their inter- 

 mediate hosts, for such tapeworms as have arthropods as intermediate 

 hosts. 



ANOPLOCEPHALIDAE 



It is Still true that the life histories of the anoplocephaline tape- 

 worms are unknown. The larval cestode which has been reported from 

 Aphodiiis obscurus and tentatively referred to Cittotaenia marmotae 

 has not been definitely coupled with that worm by the test of success- 

 ful feeding experiments, and the record is of value primarily as a 

 possible clue to solving the unknown life histories in this group. 



