yo.im. LEECHES OF THE (J. 8. KATIONAL MUSEUM— MOOIiE. 559 



In many specimens, perhaps in a majority, the two dark stripes are 

 partly or wholly confluent behind as well as in front of the clitellum. 

 In Kuch the lateral light stripes become merely a succession of inore or 

 less confluent small spots, or are entirely' wanting. All degrees of 

 transition between the two and four striped varities are found, the 

 former giving the impression of light, the latter of dark, colored worms. 

 The median and marginal light stripes are always well marked. Pos- 

 terior sucker yellow. There are no pigmented eyes. 

 One of the larger specimens measures as follows: 



Mm. 



Length \2.'> 



Oreateht breadth (about the same for the posteuor lialf ol' tin; body; ?,.'! 



Depth of posterior region, about 1 



lireadth at male pore 3. 3 



Depth at male pore (including genital elevation) 2.5 



IJreadth at Honi i te VI I . S 



Depth at Honiite VI 1.3 



iJreadtli at anterior Hiicker 1.5 



Dcptli at anterior Mueker 1.5 



IJreadth at anim 2. 7 



Breadth of posterior sneker 1.5 



No. 4Hf4, TJ.S.X.M. Mountains of San Diego County, California; 

 C. J{. (Jrcutt. Forfy three specimens. ICleven of these were selected 

 as types for the above <lescrii)tion. 



No. oO'il, 1J.8.X.M. San Diego, California; in fresh water; C. R. 

 (Jrcutt. One specimen. 



21. DINA species?. 

 Xephclin r/iiadrintriala Vkkhii,!,. 



This is our most abundant eastern nei»helid, and is very widely dis- 

 tributed. It differs greatly from JJ. quadrintriata Grube, as determined 

 by lilanchard, and seems to be without a name. With us it varies in 

 color with the greater or less develoi)ment of the black dorsal stripes. 

 The eyes are usually reduced, as stated by \'errill, to tiiree i)airs, 

 owing to the union of the anterior two i)airs. 



No. o0:>2, Ij.S.N.M. Currant Kiver, Shannon County, Missouri; K. 

 Ellsworth. One specimen. 



22. DINA QUADRISTRIATA (Grube; Blanchard. 



Nephfl'm f/nadriHtriata (invBK. 

 Xepheliii mcxicana E. ]){:(ikH. 



No. 4941, U.S.N.M. Mexico; A. Duges rNo. 170). Twelve speci- 

 mens. 

 No. 4809, U.S.N. M. Mexico; A. Duges. Four specimens. 



HERPOBDELLA Biainville. 

 23. HERPOBDELLA PUNCTATA. 

 Nephelis punctata LkiijY. 

 No. fiOO, U.S.N.M. Yellowstone Park; Hay(l<;ns expedition, 1872. 

 One specimen. 



