90 Lake Maxinkuckee, Physical and Biological Survey 



DD. No distinct enlargement of anterior seg-ments to form a head; form 

 greatly depressed, foliaceous. 



6. Integuments rather opaque; colors in a bold pattern of yellow and 

 olive green or brown; dorsal papillae low and smooth; lenglh up to 

 3 inches. P. parasitica 



7. Integuments translucent; colors a much broken pattern of mixed 

 yellow, brown and green; dorsal papillae very numerous, elevated and 

 rough; length up to 2^/4 inches. P. imgosa 



AA. Mouth large; pharynx without protrusible proboscis; complete somites 

 usually of five annuli, some of which may be subdivided. 



E. Pharynx usually provided with three distinct toothed jaws; testes several 

 metameric pairs; eyes five pairs in as many segments. Hirudinidse 



8. 12-16 pairs of coarse teeth on each jaw; genital orifices separated by 

 five annuli, penis filiform; color usually a mottled pattern of black 

 or brown and gray, sometimes plain dark green or yellow; usual 

 length 3-5 inches. Hsemopis marmoratus 



EE. Pharynx provided with three longitudinal muscular folds but no toothed 

 jaws; testes numerous and minute, not metanneric; eyes usually three or 

 four pairs in two groups. Erpobdellidx 



F. Last annulus (b 6) of each somite not obviously enlarged or subdivided. 



Erpobdella 



9. Genital orifices separated by two rings ; eyes three pairs ; color usually 

 two or four dark longitudinal stripes separated by paler bands; loops 

 of vasa deferentia reaching to ganglion XI; length about 2-3 inches. 



E. piinctata 



FF. Annulus b 6 obviously enlarged and subdivided. Dina 



10. Genital orifices separated by two rings; eyes three or sometimes four 

 pairs; pigmentless or dorsum marked with irregular scattered spots; 

 vasa deferentia not reaching ganglion XI; length 1 to 1% inches. 



D. fervida 



11. Genital orifices separated by three and one-half (sometimes three) 

 rings; eyes four pairs; pigmentless or more usually with numerous 

 small, often confluent, dark spots, sometimes forming a median 

 stripe; vasa deferentia as in 9; length seldom in excess of 1 inch. 



D. pa7-va 



GLOSSIPHONID^ 



1. GLOSSIPHONIA STAGNALIS (Linnaeus) 



This almost cosmopolitan and usually very abundant species 

 is very poorly represented in the collection by twenty-two speci- 

 mens from three localities. In the small meadow ponds and shal- 

 low lakes that abound throughout the northeastern United States 

 and contiguous portions of Canada this species occurs in great 

 numbers. It also occurs in the warm shallow waters of creeks and 

 rivers, especially in quiet bays overgrown by aquatic vegetation. 

 These leeches shun the bright light and congregate in great num- 

 bers under stones and the ensheathing foot-stalks of the leaves of 

 rushes, Sagittarise, etc. 



