NO. 3 COPEPODA FROM PANAMA — MARSH 1 7 



the outer distal angle it bears a stout seta which is of about the same 

 length as the seta upon the last cephalothoracic segment. 



The egg sacs contain from seven to ten eggs each. 



The average length of the mature females is 0.696 mm. 



Found on the savannas between Panama and Old Panama. 



CYCLOPS VARICANS Sars 



The occurrence of Cyclops varicans in America has been discussed 

 in a former paper (Marsh, 1910, 1101). While there was good 

 reason to suppose that this species, of world-wide distribution, be- 

 longed also to the fauna of North America, in the absence of figures 

 and descriptions there was still some doubt. Daday has reported it in 

 Patagonia (1902a, p. 208) and Paraguay (1905, p. 135), while van 

 Douwe (1912, 315) has reported it in Brazil. Only a few individuals 

 were found in the Panama collections and these in only one locality, 

 the Black Swamp, along the old line of the Panama Railroad. These 

 individuals were mature, however, and corresponded in all details 

 to the typical forms. The first antennae are short and composed of 

 twelve segments (pi. 5, fig. 4). 



The swimming feet are two-segmented, the formula for the spines 

 of the terminal segments being, 3, 4, 4, 3. Plate 4, fig. 13, shows the 

 third foot. 



The last cephalothoracic segment is armed on each side w r ith a long 

 seta. The fifth foot consists of a single long slender segment ter- 

 minated with a seta (pi. 5, fig. 5). 



The female carries about twelve eggs in each sac. 



Plate 5, fig. 1, shows the form of the abdomen. 



CYCLOPS QUINQUEPARTITUS, new species 



This interesting species occurred only in collections made in the 

 Black Swamp along the line of the Panama Railroad. Only a few 

 individuals were found. It was at first supposed to be Cyclops 

 phaleratus. Careful examination showed that it corresponded in 

 structure to C. phaleratus in all particulars except that the first 

 antennae are composed of only five segments. 



No egg-bearing females were found, but they were apparently 

 mature, the swimming feet being fully developed and the general 

 appearance of the animal indicating maturity. No detailed descrip- 

 tion is necessary as it corresponds to C. phaleratus in all particulars 

 except the segmentation of the first antennae. It is somewhat smaller 

 than phaleratus. 



