230 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 



the end of the beak, are curved and bear a lateral flagellum. The 

 first foot of the female has a sort of hook (branchial sac?). The la- 

 briim is armed with teeth on the posterior face of the triangular pro- 

 cess. The intestine is very strongly, almost twice, coiled. The lower 

 margins of the valves are 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. 



Caniptocercus rectirostris Schoedler. 

 Plate LXII, Figs. 1-3. 



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 height of the body. The beak is sharp. I am 

 not sure that "Weismann's figures (1. c, Plate XI, Figs. 13 and 14) 

 really belong to this species, for the drawing of the post-abdomen 

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

 former are given in Plate LXTI, Figs. 1 and 2. The male has a hook 

 upon the first foot. Xot yet recognized in America. 



Caiiiptocerciis latirostris Kurz. 

 Plate LXII, Figs. 5-6. 

 C. Ulljeborgii, P. E. Mueller (?). 



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

 Jiead, 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. macmrus 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. 



Caniptocercus lilljeborgii Schoedler. 



Plate LXII, 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. macmrus. 



* Camptocercus rotuudus Herrick. 



The second of the two species found in America is this short, 

 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 lougantennules, which extend far below 

 the beak; and the somewhat pointed beak. The head is much as in 



