Copepoda Found in the Vicinity of Li?icoln, Nebraska. 127 



short, the last being somewhat longer, and about as long as 

 the furca. The furcae are longer than broad, and are ciliate 

 along the inner aspect. 



The antennae reach to the end of the furca. 



The fifth foot of the female (Fig. 8) has a nearly triangular 

 basal joint, which bears a seta at its outer angle. The inner 

 ramus is short and stout, bearing minute spines at its tip. 



The terminal claw has eight or ten strong teeth on its inner 

 aspect, and a few smaller ones on the outer edge. The third 

 joint is represented by two small spines and a short seta. 



The antenna of the male (Fig. 6) is much swollen, and 

 bears an unusually strong spine on the first swollen joint. 

 It is not as long as the antennae of the female. The antepe- 

 nultimate joint bears a short hook like that of sanguineus. 



The basal joint of the male right fifth foot (Fig. 5) bears a 

 small tubercle at the middle of its inner aspect. The seta on 

 the outer edge is short. The inner ramus is shorter even 

 than the very short first joint of the outer ramus. It bears 

 a few small teeth at its tip. The accessory spine is close to 

 the terminal claw, and is unusually long. The claw is bent 

 at its middle to nearly a right angle. The first half bears 

 fine teeth. 



The left fifth foot reaches a little beyond the first joint of 

 the outer ramus of the right. The basal joint has a tubercle 

 which nearly meets that of the right foot. The inner ramus 

 is like that of the right foot. The two joints of the outer 

 ramus bear hairy pads on their inner aspects. The terminal 

 joint bears a short curved spine and a short finger-like 

 process. 



The female measures 1.5 mm., the male 1.25 mm. in 

 length. 



Types are deposited in the U. S. National Museum, in the 

 Museum of the Cincinnati Society of Natural History (Acc. 

 Cat. No. 15,001), and in the zoological collection of the Uni- 

 versity of Nebraska, Lincoln. 



This species has been found principally in temporary pools. 

 It was found once in the late fall in a small constant pond, 

 but was not there early in the spring. It probably appears, 

 like Diaptomus sanguineus, in the spring and fall only, fol- 

 lowing that species often. 



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