138 



BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



Hosts. — Accipiter bicolor, A. nisus, Aquila albicilla, A. chrysaetos, 

 A. fasciata, A. imperialis, A. naevia, A. pennata, Archibuteo lagopus, 

 A. vulgaris, Astur palumbarius, Bubo -maximus, B. virginmnus, Cir- 

 caetus gallicus, Gircestus pectoralis, Circus aeruginosus, C. cinera- 

 ceus, G. cyaneus, G. rufus, Falco aesalon, F. albicilla, F. apivorus, F. 

 ater, F. brachy dactyl us, F. brasiliensis, F. buteo, F. chrysaetos, F. 

 cyaneus. F. degener, F. gallicus, F. imperialism F. lithofalco, F. 

 lanarius, F. lagopus, F. milvus, F. naevius, F. nisus, F. palumbarius, 

 F. penrtaius, F. peregrinus, F. rufus, F. rutilans, F tinnunculus, 

 Gypaetus barbatus, Gyps fulvus, Haliaetus albicilla, Milvus ater, 

 Milvus milvus, M. regalis, Nisaetus fasciatus, Strix aluco, S. brachy- 

 otus, 8. bubo, S. dasypus, S. flammea, S. nyctea, S. otus, S. stridula, 

 S. tangmalmi, Vultur cinereus, V. fulvus, V. monachus. Larvae in 

 Sorex tetragonurus and Talpa europaea. 



L ocatiori . — Intestine. 



o/mm 



Figs. 200-202. — 200, Porrocaecdm angusticolle. Dorsal lip. 201, Male tail. 

 202, porrocaecum depressum. dorsal lip. after baylis and daubney, 1922 



Morphology. — Porrocaecum (p. 135) : Large lips (fig. 202) with 

 dentate edges and with pulp projecting in 2 bipartite processes, 

 and internal to them a large median lobe, rounded anteriorly, dis- 

 tinctly visible where it projects beyond the saddle joining the 2 

 main lobes; 2 large papillae on outer surface. Small interlabia 

 sharply pointed. 



Male 24 to 100 mm. long. Six pairs of postanal papillae (fig. 

 203), the most anterior pair composed of double papillae near the 

 cloacal aperture and the other 5 pairs on a conical prolongation of 

 the posterior end. Seventeen pairs of preanal papillae. 



Female 30 to 112 mm long. Vulva in anterior third of body, 

 according to Linstow; Schneider says 37 mm. from head end in a 

 97 mm. long specimen. Eggs with double shells, thickened at the 

 poles and with fine dots (Punktchen). 



