NO. 3 COPEPODA FROM PANAMA — MARSH 13 



CYCLOPS ALBIDUS Jurine 



Cyclops albidus was found only in the collections made in the Black 

 Swamp. 



No significance is to be attached to this restricted distribution, as 

 the species is found the world over ; it simply means that it probably 

 does not occur in any great abundance in the Canal Zone, at least 

 at the time of year when the collections were made. 



CYCLOPS SERRULATUS Fischer 



Cyclops serrulatus occurred on the northern slope in the Comacho 

 reservoir, in a pond at Bohio, in the Black Swamp, and in the Rio 

 Trinidad and the water immediately connected with it. On the 

 southern slope it was found at Miraflores and in stagnant water on 

 the savannas near Panama. 



CYCLOPS PRASINUS Fischer 



Cyclops prasinus occurred in only a few localities. It was found in 

 the Black Swamp, a region that is to be covered by Gatun Lake, in 

 Gatun Lake, in a stream near the Alhajuela caves, and in a pond 

 near Bohio. 



CYCLOPS TENUIS Marsh 



1910. Cyclops tenuis Marsh, p. 1085, pi. 75, figs. 4-9, pi. 79, fig. 5- 

 Cyclops tenuis was originally described from material collected at 

 Calabasas, Arizona, and up to the present time has been found in no 

 other locality. Its occurrence in the Canal Zone is therefore a 

 matter of considerable interest. It belongs to the leuckarti group 

 resembling that species in general form, armature of the fifth feet, 

 and spinous armature of the membrane connecting the fourth feet, 

 but differing in size, lack of armature of terminal segments of the 

 antennae and of crenulations on the maxillipede, and in the form of the 

 fifth feet and of the receptaculum seminis. 



It is very closely related to C. oithonoides, from which it distinctly 

 differs in the fact that the antennae are shorter and do not have a 

 hyaline membrane on the terminal segments ; the receptaculum 

 seminis, too, is different from that in C. oithonoides. 



The specimens from the Canal Zone correspond very closely with 

 those from southern Arizona, but were much smaller. The average 

 length of females from Gatun Lake was 0.683 mm., from the Trini- 

 dad River 0.66 mm., and from Agua Clara Reservoir 0.63 mm. 

 Most of the egg-bearing females had four eggs in each sac ; none have 



