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THE AMERICAN NATURALIST [Vol. XL 



and are thickly set on the outer sides of all the succeeding joints, 

 where they are about equal in length to the diameter of the joints. 

 The whole palp, if extended straight backward, would reach 

 about to the base of the caudal segment. 



Ovigera (PI. 2, Fig. 9) ll-jointed;^ about a third longer (in 

 the female) than the palp, the length to the principal flexure, be- 

 tween the fifth and sixth joints, being, however, almost exactly 

 equal to the length of the palp to the corresponding place. 

 Joint 1 short; joints 2 and 3 about equal in length, and longer 

 than joint 1 ; joints 4 and 5 each slightly more than twice as long 

 as joint 2 or 3; joint 6 bent backward upon joint 5, and only a 

 little more than half as long; joints 7, 8, 9, and 10 grow succes- 

 sively smaller, both in length and in diameter; this part (the 

 "terminal part") of the oviger is usually somewhat flexed. The 

 terminal claw, which constitutes the eleventh joint of the append- 

 age, is small and curved. The first four joints are practically 

 free from hairs or spines; a few scattered short spines occur on 

 joints 5 and 6; joints 7 to 10 are armed with three or four series 

 of denticulate spines with deeply incised margins. These spines 

 are longer on one side of the joint, and become smaller in each 

 of the longitudinal rows as one moves across to the other side 

 (PI. 2, Figs. 9 and 10). Each of these joints has in addition 

 near its distal end a rather strong simple spine. At the middle 

 of the fourth joint is a prominent knob-like protuberance, which 

 probably carries the opening of what Dohrn ('81, p. 123) calls 

 the excretory organ. 



Legs rather stout, somewhat less than twice as long as body 

 from anterior end of neck to tip of caudal segment. Coxal joints 

 (PI. 2, Fig. 8) all short and broad, the second being a little longer 

 than the first and third, which are about equal. The femur and 

 first tibial joint are each a little shorter than the three coxal 

 joints toiretlicr, while the second til)ial joint is sliglidy longer than 



as broad; tibial joints narrower. Tlior joints arc flattened from 

 side to side, so that the ventral niargiti forms rather a sharp edge. 



■I agree with Dohrn ('81, p. 123) that ttie tenuinal claw shouhl be counted 



