84, TWELFTH AITNUAL REPORT. 



feebly spined for three-fourths their length, and armed with from 

 one to four teeth at the angle. Length 0.8 mm. to 1.0 mm. 



Sp. 3. Camptocercus rectirostris, Schoedler. 

 (Plate I. Figs. 1—3.) 



Camptocercus rectirostris, SCHOBDLER, P. E. MUELIiEK, KURZ. 



Distinguished from the above, which it closely resembles, by the 

 form of the head, which is less rounded and directed anteriorly. It 

 hardly exceeds half the hight of the body. The beak is sharp. I 

 am not sure that Weismann's figures (1. c, plate XI, figures 13 and 

 14) really belong to this species, for the drawing of the post-abdo- 

 men does not agree with that of P. E. Mueller fully. Outline copies 

 of the former are given in plate I, figs. 1 and 2. The male has a 

 hook upon the first foot. Not yet recognized in America. 



Sp. 4. Camptocercus latirostris, Kurz. 

 (Plate I. Figs. 5—6.) 



C. liUjeborgii, P. E. MUELLER (?). 



Closely allied to the next, but distinguished by the position of 

 the head, which is a little less depressed, and, especially, by the 

 truncate beak. The dorsal margin is convex and crested; the lower 

 outline is also convex. The claws are toothed more as in C. macru- 

 rus than the following. The basal spine springs from the claw 

 itself and not from the post-abdomen as in the next. Length 0.9' 

 mm. to 1.0 mm. 



Sp. 5. Camptocercus lilljeborgli, Schoedler. 



(Plate I. Figs. 7—8.) 



Head depressed, rounded in front: beak divided at the end by the 

 extension of the fornices. The terminal claws are pectinate for 

 their entire length, and the basal spine is seated on the end of the 

 post-abdomen. This species, in the main, closely resembles C. 

 macrurus. 



Sp. 6. Camptocercus rotunduSjHerrick. 



The second of the two species found in America is this shorty 

 strongly carinated form, which is known from a single gathering. 

 It differs from all the above species, with which it agrees pretty 

 well in shape, by its more compact form; high dorsal keel (which 

 extends the entire length of the body); the long antennules, which 

 extend far below the beak; and the somewhat pointed beak. The 



