500 



» 



right of the median line. Gravid segments transformed into 

 a sac full of eggs; eggs surrounded by 3 shells separated one 

 from another. Inner .^In-ll without pyriform body, but oc- 

 casionally with a small knob at each pole. Larva is a Crypto- 

 cystis or Staphylocystis; intermediate host an insect or myria- 

 pode. Type species: H. diminuta (Rud., 1S19). 



(Revised generic characters from Blanchard, ISOIC, pp. 49-uO. 

 I inclose in brackets several characters which I can hardly look 

 upon as generic. For bibliography see R. Blanchard, 1891C.) 



Weinland proposed this genus with Taenia flavopunctata as 

 type, but as this form is identical with taenia diminuta the 

 name H. diminuta is here inserted as type species. At the 

 same time he proposed a genus Diplacanthus (nee L. Agassiz) 

 with Taenia nana von Siebold as type species. The term Dip- 

 lacanthus must drop, as it is preoccupied, and there seems to 

 be no good grounds for separating H. nana generically from 

 H. diminuta. 



Weinland divided Hymenolepis into two subgenera: (1) Lep- 

 idotrias Weinland, 1858 (with 3 eggshells) with H. murina 

 (Dujardin, 1845) Weinland, 1858, as type species, and including 

 Taenia scalaris, scutigera, tiara, pistillum, microstoma, nasuta, 

 undulata, serpentulus, cratepiformis, sinuosa and flavopunc- 

 tata; (2) Dilepis Weinland, 1858 (with 2 eggshells), with T. 

 angulata Rud. as type species, and containing T. purpurata, 

 porosa and lanceolata. Of these forms T. sinuosa (vide Drep- 

 anidotaenia sinuosa p. 604) and T. lanceolata (vide Dr. lanceo- 

 lata p. 597) occuer in domestic fowls. 



Most of the species of this genus are parasitic iu 

 maiumals, but Weinland included a number of avian 

 tapeworms in Hymenolepis. Blanchard (1891 C, pp. 

 (;S-G9), Jiscusses the l'(M-ms and concludes that only 

 four avian species can be included here with any dc 

 <>Tee of probability. These species mentioned below 

 do not occur in domesticated fowls. 



Hymenolepsis serpentulus (Schrank. llflS) Weinland. 1S.")S. 

 (fiyn. 1798, Taenia serpentulus Scrank [nee Duj., 1845]. found in 

 Oriolus galbula, Corvus cornix, C. corone. C. frugilegus. C. mon- 

 edula. Nucifraga caryocatartes, (larrulns glandarius. Pica cau- 

 data. Picus aurulentus. 



Hymcnnlepis angulata (Rud.. ISKi) W'-inlaiid. IS.'.S, (Syn. ISIO, 



