NO. 1105. rnocEEDiyGS of the national museum. 147 



that tliey cau scarcely be recognized, it can liardly bo expected that the 

 larvio can be determined with certainty. The work by ]\rrazek, JMoniez 

 Ilamann, von Linstow, and others in describing these larval forms has 

 been most valuable ; but authors have, I believe, generalized too much 

 upon these observations.^ 



Aelxnordedfjments. — I am indebted to the following gentlemen for fur- 

 nishing me with specimens for study in preparing this revision: 



Prof. Eaphael Blanchard, of Paris: A portion of Baird's type of 

 Tamki [/oezei; specimens of Anoplocephala wimerosa and Cittotivnia 

 leuclcarti. Dr. Gustav Brandes, of Ilalle : Original cotypes of Riehm's 

 DipyJidlum pecUnatum, D. lencJMrti, and D. latinsimum. Greheimrath 

 Karl Mobius and Dr. A. Collin, of Berlin: Fragment of Rudolplii's 

 Ta'niapectinata. Prof. Herbert Osborn, of Ames, Iowa: Specimens of 

 Cittotccnia prwcoquis. Prof.M. J. Elrod,of Bloomington, Illinois: Speci- 

 mens of Bertia americana. Mr. J. H. Tallichet, of Austin, Texas : Speci- 

 mens of Darainea salmoni and Cittotamia variahiJis. Dr. A. K. Fisher, 

 Division of Mammalogy and Ornithology, United States Department 

 of Agriculture: Specimens of Davainea retractilis. Mr. Robert A. 

 Mills, of Chuluota, Florida: Specimens of Cittotcvnia rariahilis inihri- 

 cata. Dr. Austin Peters, of Boston, Massachusetts: Specimens of C. 

 variahilis. 



The other material- used belonged to collection of Bureau of Animal 

 Industry (collected by Curtice, Hassall, Stiles) ; collection of the United 

 States ISTational Museum; collection of Leidy (University of Pennsyl- 

 vania), and collection of Stiles (United States I>]"ational Museum). 



Althougli this article treats primarily of leporine cestodes, it has 

 been found necessary to include several forms from other hosts for 

 comparison. 



To my assistant, Albert Hassall, I am indebted for the entire technique 

 connected witli the specimens used, and also for the preparation of the 

 bibliography, and to Mr. W. S. D. Haines, artist of the Bureau of Ani- 

 mal Industry, Department of Agriculture, for preparing the plates. 



Unfortunately much of the material at my disposal was poorly 



' For a detailed discussion of this subject cf. Stiles: Report upon the Prestmt Knowl- 

 edge of the Tapeworms of Poultry, Bull. 12, Bureau of Animal Industry, U. S. Depart- 

 ment of Agriculture, 1896. pp. 7-73, pis. i-xxr. 



^ Since issuing my preliminary note on this group, I have received the following 

 specimens from the gentlemen mentioned : 



Prof. A. Moniez, of Lille: His entire collection of auoploceplialiue cestodes, 

 including the type specimen of Twnia wimerosa and undetermined specimens of 

 Cittotivnia denticulata and C. pectinata. Geheimrath Rudolf Leuckart, of Leipzig: 

 cotypes of Riehm's Twnia rhopaloccphala and T. rhopalioceiihala and one of Meyner's 

 originals of Twnia (Bertia) mucronata. Dr. Victor A. Xorgaard, of Alice, Texas: 

 Specimens of Davainea salmoni. Dr. O. ron Linstow, of Gottingen : Specimen of 

 Cittotwnia pectinata. Dr. von Marenzeller, of Vienna : Several of Riehm's cotypes. 

 Dr. Collin, of Berlin : Rudolphi's cotypes of Taenia denticulata. 



The manuscript of this article w:is delayed in order that these specimens could 

 be studied aud the results incorj)orated in the revision. 



