THE LEECHES OF MINNESOTA 71 



a. Jaws prominent, bearing many small teeth arranged in 

 one series ; accessory copulatory glands present and 

 opening in pores behind the female genital orifice. 



13. Teeth about sixty-five in each jaw; genital 



pores separated by five annuli ; the dorsum 

 marked with median red and marginal black 

 spots, both metameric. 



Macrobdella decora, 106 



aa. Jaws prominent, bearing a few coarse teeth arranged 

 in paired series ; no accessory copulatory glands. 



14. Teeth twelve to sixteen pairs on each jaw ; the 



primary annuli Vllffj and Villa/ enlarged, 

 but only partially divided into secondary 

 annuli ; color variable but marked more or 

 less thickly with non-metameric black 

 blotches. Haemopis marmoratis, no 



15. Teeth twenty to twenty-five on each jaw; the 



secondary annuli VII65 and b6 and Villi/ 

 and b2 completely formed ; color nearly uni- 

 form, usually with a median dorsal dark 

 stripe and few or no blotches. 



Haemopis lateralis, 113 

 aaa. Jaws absent or rudimentary; no teeth; no accessory 

 copulatory glands. 



16. Male genital orifice at XI b$/b6; the female at 



Xllbj/bd; color pattern consisting in part 

 of close or distant blotches of dark pigment, 

 ventral ground color lighter than dorsal. 



Haemopis grandis, 117 



17. Male and female genital orifices constantly at 



the middle of Xlb6 and XII b6 respectively ; 

 a few distant dorsal blotches or none ; no 

 ventral blotches, ventral ground color not 

 paler, usually darker than dorsal, the rufous 

 or orange marginal stripe conspicuous. 



Haemopis plumbeus, 115 

 AA. Eyes three or four pairs, not arranged in a regular arch, 

 two pairs situated on somite IV ; genital ducts rela- 

 tively simple, without complex copulatory apparatus ; 

 testes numerous, not regularly paired ; no gastric c?eca. 



