74 ILLINOIS BIOLOGICAL MONOGRAPHS [424 



sides of proglottid slight. Number of testes about 200. 

 With prostate cells on vas deferens. Cirrus pouch 90/x 

 long. Host, PtUopus sp., Sumatra. (See Fuhrmann, 1902.) 



M. columbae 



46. Uteri of two sides never united. Testes about 140. No prostate 



cells on vas deferens. Cirrus pouch 300 to 450/i long. 

 Hosts, Ptilonopus sp., Lorius erythrothorax, Trichoglossus 

 novaehoUandiae, Cyclopsittacus suavissimus, and other par- 

 rots, New Guinea and Sumatra. (See Fuhrmann, 1902; 



also, Diamare, 1900 and 1901.) M. carrinoi 



Uteri of two sides becoming connected very early, anteriorly. 

 Number of testes, about 100. Host, Chrysotis amazonica, 



South America. (See Fuhrmann, 1902.) M. ambigua 



Uteri of two sides becoming connected distally. Hosts, 4 species of 

 Rhamphastos. Description poor. (See Fuhrmann, 1904.) 



M. variabilis 



47. With interproglottidal glands, which are linear, and are not 



grouped around blind sacs (very indistinct in M. bene- 

 deni.) Planissima-growp 48 



With interproglottidal glands, which are grouped around blind 

 sacs. Expansa-group 49 



No interproglottidal glands. AZ&a-group 50 



48. Length, 1 to 2 m. Ripe segments 12 to 26 mm. broad, and 1 



to 1.75 mm. long. Interproglottidal glands large, distinct. 

 Hosts, Bos taurus and Ovis aries. (See Stiles & Hassall, 

 and others.) — _ M. pianissimo 



Length, 4 m. Ripe segments 12 mm. broad by 3 mm. long. 

 Interproglottidal glands indistinct (absent?). Hosts, Bos 

 taurus and Ovis-aries. Better study needed. (See Stiles 

 & Hassall, 1893.) M. benedeni 



About 0.66 m. long. Largest segments 8 mm. broad by 1.5 

 mm. long. Testes in a quadrangle. Interproglottidal 

 glands small. Host, Ovis aries. Better study needed. (See 

 Stiles & Hassall, 1893.) _ M. neumanni 



49. Length, 4 to 5 m. Testes in mature proglottids usually in a 



quadrangle, rarely in two triangles. Hosts, Bos taurus 

 and Ovis aries. See Stiles and Hassall, 1893 ; Tower, 1900 ; 



present paper, and others.) M. expansa 



Length, about 1 m. Testes less numerous and smaller than 

 in M. expansa. Host, Coassus sp., Trinidad, South Amer- 

 ica. Poorly known. (See Stiles and Hassall, 1893.) 



M. oblongiceps 



