l8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6l 



In plate 5, figs. 3. 2, and 7, are given drawings of the first and 

 second antennae and of .the fourth swimming feet. 



Van Douwe, 1912, 315, reports Cyclops phalcratus from Brazil, 

 but states that the forms, although mature, had antennae of seven 

 segments. It seems possible that further study of South American 

 and Central American material may result in the establishment of a 

 group of Cyclops species closely related to Cyclops phalcratus. 



CYCLOPS JEQUOREUS Fischer 



The literature and synonymy of Cyclops ccquorcus have been given 

 in a former paper (Marsh, 1910, 1106). The species is very widely 

 distributed, being found as far north as Finland (Martens, 1910, no), 

 and as far south as Algeria (Blanchard and Richard, 1891, p. 515). 

 It has been found in Madeira and in the Sea of Aral. Thus far there 

 have been only two recorded localities in America. Herrick found 

 it in waters connected with the Gulf of Mexico (Herrick and Turner, 

 1895, 122), in Mississippi Sound, and Mr. E. Foster has collected 

 it in Lake Ponchartrain. Considerable interest, therefore, attaches 

 to its occurrence in Panama. It occurred in a sluggish stream on 

 the savannas near Panama and in an old well in Old Panama. In 

 both cases the water was fresh, but it might have easily migrated to 

 those locations from brackish water. Inasmuch as figures of the 

 species as occurring in America have not been published, it has been 

 deemed best to illustrate the typical peculiarities of the species. Plate 

 5, fig. 8 shows the antenna of the female, plate 5, fig. 6, the abdomen 

 and fifth foot, and plate 5, fig. 9, the fourth swimming feet. 



The formula for the spines of the terminal segment of the exo- 

 podites of the swimming feet is 3, 4, 4, 3. 



GENERAL OBSERVATIONS ON THE DISTRIBUTION OF THE 

 COPEPODA FOUND IN PANAMA 



The presence of Cyclops albidus, Cyclops leuckarti, Cyclops scr- 

 rulatus, and Cyclops prasinus has no significance from the standpoint 

 of the distribution of species. These species are cosmopolitan, and 

 one would expect to find them in Panama. A new locality for a 

 species has some interest, of course, but in these cases it only cor- 

 roborates what we had known before of the world-wide distribution 

 of these forms. 



More interest attaches to Cyclops varicans, for, if this occurs in 

 the United States, it certainly is uncommon, while apparently it is 

 characteristic of the fauna of South America. The same may 

 possibly be true of Cyclops tenuis. In the discussion of this species 

 it is remarked that Cyclops oithonoides has been reported from 



