NO. 2 SMITHSONIAN EXFLOKATIONS, I924 47 



favored for attachment l)y Cerions. These islands are placed south of 

 the laboratory and east of the men's quarters. They have been 

 stocked with : 



1. 25 Cerion incanum and 25 Cerion new species 



2. 25 Cerion incanuiii and 25 Cerion chrysalis 



3. 25 Cerion incanum and 25 Cerion mummia 



4. 25 Cerion incauitni and 25 Cerion tridcntata 



5 and 6. In each compartment a two-thirds grown individual of Cerion incanum 

 and Cerion viaregis. 



On June 15, during the return trip to Key West, Man and Boy 

 Keys were visited. The Boy Key colony has in part survived the 

 burning of last year, but that on Man Key has again been burned 

 over and it is questionable if any living thing is left in it. 



Thanks to the authorities of the United States Bureau of Fisheries, 

 some plantings were made within the compound of the Fisheries 

 station at Key West where our colonies will be safe from burnings. 

 Two colonies were established here on the opposite extremities of 

 the seaside leg of the grounds. They consist of 500 specimens each 

 of Cerion viaregis and Cerion incanum, and 500 each of Cerion tri- 

 dcntatum and Cerion incanum, respectively. 



In addition to the work done at the various stations on the Florida 

 Keys and Cuba, twenty of the hybrid Cerions from the Newfound 

 Harbor colony have been dissected at the National Museum by Miss 

 Mary E. Quick, under the direction of Dr. Bartsch. These show most 

 remarkable changes in anatomic character. It is planned to make a 

 greater number of dissections of these hybrid Cerions in order to 

 determine the range of changes produced by hybridization. 



While at the Tortugas, Dr. Bartsch exposed 1,200 feet of moving 

 picture film with his undersea camera, photographing denizens of 

 the coral reef. He took the precaution this year to place the camera 

 upon a tripod, which has eliminated the seasickness-producing effects 

 obtained during similar efforts last year when the camera was held 

 freely in the hands while working in a rather rough sea. The negatives 

 since developed are quite satisfactory. 



As in previous years a full record of the birds seen from day to 

 day was kept and added to the list recorded in the past. This has 

 yielded so far not only a large series of notes on the avian population 

 of the Florida Keys and the breeding habits of local forms, but much 

 information on bird migration. 



