68 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 8l 



LIST SHOWING RECORDS (X) OR LACK OF RECORDS (O) OF 

 PARASITE GROUPS IN HOST GROUPS 



Arthropod group Cestoda Trematoda Nematoda Acanthocephala 



Amphipoda X X X X 



Branchiopoda O X O O 



Cladocera X O X O 



Copepoda X X X O 



Decapoda X X O X 



Isopoda O O X X 



Ostracoda X O O O 



Anopleura O O X O 



Coleoptera X X X X 



Dermaptera X O O O 



Diptera X X X O 



Ephemerida O X X O 



Isoptera O O X O 



Lepidoptera X X O O 



Mallophaga X O X O 



Neuroptera O X O X 



Odonata X X X O 



Orthoptera O O X X 



Plecoptera O X O O 



Siphonaptera X O X O 



Trichoptera O X O O 



Insecta ; unplaced O X O O 



Myriapoda X O O O 



Arachnida O O X O 



It is of interest to note that of the 24 arthropod groups Hsted above, 

 the number of groups used as hosts by cestodes, trematodes, and nema- 

 todes is the same or almost the same, namely, 13 by cestodes and 

 trematodes and 14 by nematodes ; only 6 are used by acanthocephalids. 



From the foregoing something may be indicated as to the range of 

 parasites on the part of the various intermediate host groups, as fol- 

 lows: 



Hosts for 4 worm groups : Amphipoda and Coleoptera. 



Hosts for Cestoda, Trematoda and Nematoda : Copepoda ; Diptera and Odonata. 

 Hosts for Cestoda, Trematoda and Acanthocephala: Decapoda. 

 Hosts for Cestoda and Trematoda : Lepidoptera. 



Hosts for Cestoda and Nematoda : Cladocera ; Mallophaga and Siphonaptera. 

 Hosts for Trematoda and Nematoda : Ephemerida. 

 Hosts for Trematoda and Acanthocephala : Neuroptera. 

 Hosts for Nematoda and Acanthocephala : Isopoda ; Orthoptera. 

 Hosts for Cestoda only : Ostracoda ; Dermaptera ; Myriapoda. 

 Hosts for Trematoda only : Branchiopoda ; Plecoptera, Trichoptera, and un- 

 placed insects. 

 Hosts for Nematoda only: Anopleura and Isoptera; Arachnida. 

 No group is yet reported as a host group for Acanthocephala only. 



