38 



The Canadian Field-Naturalist 



[Vol. XXXVI 



"Amherst, Magdalen Islands, Quebec, middle of 

 July, 1917. F. Johansen." Three small ex- 

 amples. 



"McKay Lake, Ottawa, Ontario, September 22, 

 1918. F. Johansen." One. 



"Ottawa River, near Hull, Quebec, October 13, 

 1918. F. Johansen." One with D. parva and 

 G. complanatn. 



"Bight of Ottawa River (Hull Park), Quebec, 

 July 6 and 7, 1919." One small leech and one 

 egg capsule; with G. heteroclitus. 



"Stream near Chelsea Road, Hull, Quebec, 

 May 9, 1920. F. Johansen." Three specimens 

 medium size and typical coloration. 



"Ottawa River, at Interprovincial Bridge, Huil, 

 Quebec, May 30, 1920. F. Johansen." One, 

 with genital pores separated by three annuli. 



"Lake at Cochrane, Ontario, June 21, 1920. 

 F. Johansen." One ,of medium size. 



"Solomon Lake (near Yarmouth), Nova Scotia, 

 October 4, 1920. A. G. Huntsman." One small, 

 very dark example. 



"Pond on fields at Moose Factory, Ontario, 

 July 14-15, 1920. F. Johansen." One small 

 specimen, with the black spots limited to the 

 paramedian series. 



"A. N. S. No. 1131, Long Point, Ontario, 

 September 24, 1899. Reighard." 



"A. N. S. No. 1132, Rondeau Harbor, Ea^t 

 Swamp, Ontario, August 28, 1899." 



"A.N.S. No. 3400, near Wiarton, Georgian Bay, 

 Ontario, July 12, 1915. A. B. Klugh." 



Erpobdella punslata subspecies annulata nov. 



Form similar to E. punctata, but in extension 

 rather more slender and terete; in contraction 

 similarly depressed and with sharp borders 

 posteriorly as in that species. Size medium, the 

 available specimens not exceeding two inches in 

 length. The type has the following measure- 

 ments. Length 42 mm., to clitellum 6 mm., of 

 clitellum 8 mm. Width just anterior to clitellum 

 1.7 mm., width at male orifice 3 mm., width mid- 

 way between clitellum and caudal end 2.2 mm. 



Annulation, position of eyes, genital orifices 

 and nephridiopores exactly as in E. punctata. 

 Dissections show that the reproductive organs are 

 identical with those of E. punctata and sections 

 that the muscular coats are equally thick. 



On the dorsum the ground color is olive brown; 

 on the venter abruptly much paler, inclining to 

 yellow and strictly immaculate. Dorsally the 

 lip is dusky and is followed by an area on the 

 posterior part of the head that is paler and without 

 definite markings but with a suffused duskiness. 

 Following this the remainder of the dorsum to 

 the anus is strongly and conspicuously barred 

 with black. Each annulus bears a heavy but 



irregular transverse bar lying somewhat nearer to 

 the cephalic border. In most cases this continues 

 across the middle line but there becomes some- 

 what narrower, giving the effe?t of a pale median 

 longitudinal stripe. Toward the margins a^so of 

 some specimens the bars may become incised, in 

 which case they end laterally as deep black spots. 

 The cutaneous sense organs appear as minute 

 pale points on the dark background but they are 

 too small to break up the black bars as in typical 

 punctata. Caudal of the anus and on the sucker 

 black pigment is scanty, occurring chiefly as 

 lines on the radiating ridges. 



E. annulata has been known to me since 1899 

 when Professor Trevor Kincaid sent me a small 

 collection of leeches from Lake Washington, n-'a'' 

 Seattle, which included twenty-two specimens of 

 this form. It was dissected and studied at that 

 time and most of this description written but 

 never published. The type is No. 3885 of the 

 collection of the Academy of Natural Sciences 

 of Philadelphia. 



It is clearly a well-marked geographical race or 

 subspecies of E. punctata from which it differs in 

 the very dense pigmentation and strikingly cross 

 banded or annulate pattern. None of the upwards 

 of fifty specimens examined equals the largest of 

 E .punctata and it may prove that smaller size 

 and more slender form are among its character- 

 istics. No structural differences have been de- 

 tected and while it is easy to separate fresh, un- 

 faded specimens it is probable that bleached 

 museum specimens of the two forms could not be 

 distinguished. 



Geosraphically, E. annulata replaces typical 

 E. punctata in the humid Pacific region of Washing- 

 ton, Oregon and British Columbia, and some 

 approach to the type is found along the northern 

 border states. 



In this collection, the form is represented from 

 Vancouver. "Ucluelet, Vancouver Island, B.C., 

 June, 1909. W. Spreadborough. Fresh water." 



There are twelve specimens, all immature, but 

 with developed clitellum. All are contracted, 

 with somewhat depressed form but margins not 

 very sharp except for the caudal flanges. They 

 vary in size from 18 by 2.8 millimeters to 28 by 

 4 millimeters, the extreme width in all cases being 

 close to the caudal end. The first pair of eyes 

 usually shows distinctly, but the second and 

 third are obscure. All have the pigment some- 

 what faded but with few exceptions the annulate 

 pattern is distinct. In some the bars extend the 

 full width of the dorsum, but in most they are 

 sharply divided into halves by a median paler 

 stripe. 



