Dorsal root longer than 

 prnng or ventral root; if 

 rostellum Is armed there 

 are :J4 to .'JO hooks f)resent; 

 f,'pnilal pores unilatpral 

 (on left of segments); a 

 testicles normally pres- 

 ent in each segment; re- 

 tiaotile rostellum armed 

 with minute hooklets or 

 rudimentary and un- 

 armeri; eggs with 3 en- 

 \clol)cs; parasitic in man, 

 eliiroptcra. Insect! vora, 

 lodontP. larfd Insectivor- 

 ous birds; larval stage in 

 insects or myrlapoda, ... H YMENOLEPIS, p. 5;>1 



Hooks on suckers arranged 

 In circular rows on bor- 

 der; hooks on rostellum 

 •resemble a hammer in 

 form and arranged in a 

 double row; with four ex- 

 ceptions known only in 

 birds DAVAINEA, p. ei.T 



Hooks on suckers arranged 

 in several transverse 

 rows; hooks of infundi- 

 bulum very small (4 u ) 

 arranged in a single row; 

 known only in birds OPHRYOCOTYLE, p. 630 



Hooks on suckers arranged 

 in one median set and 

 two lateral sets; hooks on 

 rostellunu iprovideid with 

 long dorsal root and ar- 

 ranged in a single row; 

 known only in birds, ... ECHINOCOTYLt;, p. 628 



1 Anterior extremity of stro- 

 bila expanded in form 

 nf a hammer FIMIIRIARIA, p. 6:jG 



Anterior segments become 

 ealiciform and function 

 as a pseudoscolex INDIOGENES, p. 637 



Family BOTHRIOCEPHALIDAE. 



Diagnosis: Head provided with two groove or slit-like suck- 

 ers; rostellum wanting; uterus with special pore; genital pores 

 generally (possibly alwaysl dorsal or ventral. Type genus: 

 Bothriocephalus nud.. ISOS. 



