646 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 55. 



Thiebaud's colombiensis, which is, without doubt, identical with 

 marshi, was found in a small lake near Bogota. Pearse, 1915, reports 

 it as common at Fundacion in northern Colombia. The occurrence in 

 Honduras is of considerable interest, as it extends farther the known 

 range of the species. There is every reason to expect that further 

 collections will show that it occurs also in the other Central American 

 States. 



It was found in Honduras only in the collections made in September 

 and December. 



CYCLOPS LEUCKARTI Claus. 



Cyclops leuckarti was found at all times of the year, and was, 

 perhaps, the most common species. It is cosmopolitan in its distribu- 

 tion, so that no especial significance is attached to its occurrence in 

 Honduras. 



CYCLOPS SERRULATTJS Fischer. 



Cyclops serrulatus was found in only three collections, but it is 

 world wide in its distribution, and can be expected in any locality. 



CYCLOPS PRASINUS Fischer. 



Cyclops prasmus is another species that occurs widely distributed 

 in practically all parts of the world, being especially characteristic 

 of lakes. In the Central American region, Juday has previously re- 

 ported it from Guatemala and Marsh from Panama. 



CYCLOPS CEIBAENSIS, new species. 



Plate 49. 



This small and very interesting species was found in only three 

 collections, two of them being made on September 27, 1916. The 

 number of individuals was small, and not as many preparations could 

 be made as would have been desirable. There is no doubt, however, 

 that this is different from any previously described species, and it 

 seems wise to define it so far as the material will permit, leaving 

 further details to future collections. The type is catalogued under 

 No. 57392 in the collection of the United States National Museum. 



The last cephalothoracic segment is extended into lateral wings, 

 each side being armed with a long prominent seta, as shown in 

 figure 5. 



The abdomen (fig. 5) is slender. The first segment is enlarged 

 at its anterior end and equals in length the two succeeding seg- 

 ments. The remaining abdominal segments about equal each other in 

 length. The last segment is armed posteriorly with minute spines. 



The furcal rami are slender, and equal the combined length of the 

 last two abdominal segments. The lateral setae are situated at the 

 distal third of the furcae. Of the four terminal setae (fig. 1), the 

 outer and inner are short, the inner being the longer of the two. 



