COPEPODS OF THE WOODS HOLE REGION 



97 



fifth legs in both sexes also furnish additional characters. Both 

 Forbes and Rathbun gave " a fresh-water pond, Woods Hole," as 

 a habitat of this species, but the present author has not been able to 

 find it in Woods Hole. 



DIAPTOMUS SPATULOCRENATUS Pearse 



FiGXJKE 65 



Diaptomus spatulocrenatus Pearse, Amer. Nat, vol. 40, p. 246, figs. 6-9, 

 1906. — Maesh, Trans, Wisconsin Acad. Sci., vol. 15, p. 456, 1907. 



Occurrence. — Both sexes were found in great abundance in a small 

 lily pond south of Ashumet Pond, Falmouth ; a small pond near the 

 outlet of John Pond, Mashpee ; Oyster Pond, Falmouth ; John Pond, 



FiGDKE 65. — Diaptonma spatulocrenatus: a, Female, dorsal; &, spermatophore ; 

 c, female, fifth leg ; d, male, dorsal, showing twist to the right ; e, male, 

 fifth legs 



Mashpee; Flax Pond, Bourne; Red Brook Pond, Bourne; Mares 

 Pond, Falmouth. 



Distribution. — Reported hitherto only from Wigwam Pond on 

 Nantucket Island, from which Pearse obtained his tjrpe specimens, 

 and Lake Sebago, Me. (Marsh). 



Color. — Transparent with a bluish tinge, and with reddish-brown 

 irregular spots around the bases of the swimming legs; sometimes 

 these spots cover nearly the entire ventral surface ; distal half of first 

 antennae in the female, and the enlarged portion of the grasping 

 antenna in the male bright orange-red; ovaries, oviducts, and eggs 

 reddish brown; eye dark red. 



Female.— H.Q2id more or less separated from the first segment ; fifth 

 segment produced at its posterior corners and armed with two short 



