791 STUDIES ON GREGARJNES—KAMM 79 



protomerite (a phenomenon which has been nowhere else except in the 

 species Pileocephalus chinensis by Schneider in 1886 and in Acanthospora 

 polymorpha by Leger in 1897). 



Cysts spherical. 



Development extracellular, no cell destruction. 



Intestine of Ptychoptera contaminata, larva. 



Taken in Belgium? 



LIST OF SPECIES FOUND IN THE ORDER SIPHONAPTERA OF 

 THE CLASS HEXAPODA 

 Parasite Host 



actdjocephalidae 



Actinocephalus parvus Wellmer Ceralopsyllus fringiUae (Wlk.) 



C. gdlinae (Schrank), larvae 

 Steinina rotunda Ashworth and Rettie Ceralopsyllus slyx Roths. 



GENtrS OF UNCERTAIN POSmON 



Agrippina bona Strick. Ceratophyllus fasciatus Bosc. larv. 



Family ACTINOCEPHALIDAE Leger 1892: 166 

 Genus ACTINOCEPHALUS Stein 1848: 196 

 ACTINOCEPHALUS PARVUS WeUmer 

 [Figures 114 and 120] 



1911 Actinocephalus parvus Wellmer 1911:131 

 Sporonts ovoidal, maximum dimensions 140At by 75fi. Ratio LP:TL: : 



1:5; WP:WD: :1:1.3. Nucleus ovoidal, several karyosomes. Epimerite 

 a corona of eight digitiform processes situated upon a short neck. 

 Cyst and spores unknown. 



Intestine of Ceralopsyllus fringiUae (Wlk.), larva {Ceratophyllus /.); 

 and C. gallinae (Schrank), larva. 

 Taken at Konigsberg. 



Genus STEININA Leger and Duboscq 1904: 352 

 Epimerite a short mobile digitiform process changing into a flat 

 button. Spores biconical. 



STEININA ROTUND ATA Ashworth and Rettie 

 [Figures 121, 122, 123 and 124^ 



1912 Steinina rotundata Ashworth and Rettie 1912: 31 

 Sporonts solitary, obese to pyriform. No constriction at septum. 



Maximum dimensions 180/i by 80/i. Nucleus spherical, one or two large 

 karyosomes. 



Cysts spherical, 110/i to 185/i in diameter. Dehiscence by simple 

 rupture. Spores ovoidal, 12/* by 7/x. Extracellular development. Intes- 

 tine of Ceralopsyllus slyx Roths. {Ceratophyllus s.) 



Taken near Edinburgh. 



