12 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6l 



The left fifth foot of the male reaches the second segment of the 

 right exopodite. The second basal segment is about three-fourths the 

 length of the corresponding segment of the right foot, is trapezoidal 

 in form, and bears the small lateral hair near the distal end. The 

 first segment of the exopodite is somewhat shorter than the first basal 

 segment, and is much narrower at its distal end. It has a setose pad 

 on the inner surface. The terminal segment is about two-thirds as 

 long as the first and ends in a digitiform process. About midway 

 of its length is a stout curved spine, and there is a setose pad on its 

 inner margin. 



The endopodite is composed of one segment and about equals in 

 length the first segment of the exopodite. 



Length of female 1.35 mm. Length of male 1.1575 mm. 



This was first found in Guatemala by Juday, near Puerto Barrios 

 and Los Amates, and was described by him in Trans. Wisconsin 

 Acad., Vol. 17, Pt. 2, pp. 803-806. 



Inasmuch as it is a new species of considerable interest in con- 

 nection with the fauna of Panama, it has seemed best to describe it 

 in some detail in this place, with figures which will show the character- 

 istic features of the species. 



In Panama it occurred in the Comacho reservoir and in Rio 

 Trinidad. 



CYCLOPS LEUCKARTI Claus 



Cyclops Icuckarti was found generally distributed in the Canal 

 Zone, as would be expected, it being a cosmopolitan species. 



It occurred in all the sanitary reservoirs and in most of the other 

 fresh-water collections. The synonymy of this species has been dis- 

 cussed in a former publication (Marsh, 1910, 1081-85), ar, d it is not 

 necessary to enter upon that subject here. The Panama specimens 

 agree very closely with the types found in other localities. Plate 3, 

 fig. 6, shows the connecting membrane of the fourth feet; the two 

 blunt spines are characteristic of this species and of tenuis. Judging 

 from the figure of Schmeil (Schmeil, 1892, pi. 3, fig. 6) these spines 

 are much more prominent in European specimens than in those from 

 America. Plate 3, fig. 14, shows the labrum. In many of the Panama 

 specimens it was noticed that the hyaline membrane of the sixteenth 

 segment was minutely serrate (pi. 3, fig. 9). This was .true also of 

 some specimens collected near Havana, Cuba. This apparently has 

 never been noted in individuals from other localities, except that it is 

 figured, without remark, by Kokubo, 1912, from material collected in 

 Japan. 



