196 Field Columbian Museum — Zoology, Vol. VII. 



Family Chara<lriidfe. Plovers. 



Oxyechus vociferus Linnaeus. Killdeer. 



The Killdeer winters in some parts of Guatemala — notably 

 along the Motagua River — in considerable numbers. One was 

 observed at Atitlan on April 9th. 



Family Alcedinidse. Kingfishers. 



Ceryle alcyon Linnaeus. Belted Kingfisher. 



Belted Kingfishers were not uncommon at Atitlan, where 

 several were seen and one taken. One was seen at Amatitlan. 



Ceryle americana septentrional is Sharpe. Texas Kingfisher. 



Texas Kingfishers were found at both lakes, but more com- 

 monly at Atitlan, where two specimens were secured. 



THE ZObPLANKTON OF LAKES AMATITLAN AND ATITLAN. 



The lowest forms of microscopic animals found in these lakes 

 are treated under this head. They do not occur in any very 

 great abundance and the number of species is small. The follow- 

 ing account of these forms was kindly furnished me by Mr. H. 

 Walton Clark, Assistant, U. S. Bureau of Fisheries, Washington, 

 D. C. 



Family Volv«<*idu\ 



C<elastrum microporum Nsegeli. 



Not uncommon. A few specimens were found scattered 

 through samples No. 19 (Feb. 5th, Amatitlan, towing made at noon 

 from bottom to top in no feet water) and No. 20 (Jan. 17th, Lake 

 Amatitlan, in front of hotel). None of the specimens showed 

 the tubercles on the cells shown in many illustrations, but accord- 

 ing to descriptions and a few figures, these may be absent. One 

 colony appeared to possess eye-spots, one in each cell. One colony 

 examined measured 60 /*. diameter, cells 15 ,"; full grown col- 



