170 CARNEGIE INSTITUTION OF WASHINGTON. 



in the forenoon, possibly arrivals of the previous night. During the succeeding 

 days of high east by south winds very few appeared, 1 on July 13, 2 on the 14th, 



I on the 15th, and 1 on the 17th. 



A large moth, evidently from Cuba, was seen to come up to the lighthouse 

 at 10 a. m., July 12, and alight on the boat rigging. Its capture proved it to 

 be the strong-flying species Syntomeida epilais Walker, 



Other insects which visited the station were a green blow-fly {Lucilia) on 

 June 27 (wind east) ; a Tahanus on June 29 (wind east) ; a small gnat on July 2 

 (wind east-northeast) ; a dragon-fly seen but not caught on July 5 ; a Tahanus 

 on July 7 (wind east); 3 blow-flies {Lucilia), 1 small fruit-fly, and a Chrysopa 

 on July 8 (wind east); 1 Lucilia on July 10 (wind very light east). 



Three of five female Ochlerotatus tceniorhynchus deposited batches of eggs in 

 a dish of fresh water 3 days after being inclosed in a cage on July 12, The 

 insects were allowed to bite before confinement. 



During the period from July 18 to 30, which I spent at Tortugas, I found 

 0, tceniorhynchus fairly abundant on Loggerhead and East Keys, There is 

 certainly no breeding-place for mosquitoes on the latter, while none was dis- 

 covered as eggs or larvae on the former. All but one of the cisterns of fresh 

 water at Fort Jefferson on Garden Key had some weeks earlier been treated 

 with kerosene. The untreated reservoir contained a considerable number of 

 larvae and pupae of Culex pipiens. Several were reared to maturity and the 

 adults preserved, the males emerging before the females, as might be expected. 

 Since many specimens of Stegomyia calopus were captured on Loggerhead and 

 East Keys, it is possible that they were reared in this cistern, although no 

 larvae were discovered. 



On Loggerhead Key an attempt was made to determine whether or not 

 Musca domestica would breed in dead crabs. The results were negative; the 

 feiia'es would deposit no e??s. It was found, however, that the beach-flies, 

 Sarothromyia femoralis Schiner and Sarcophagula occidua Walker, breed 

 readily in such matter. One crab {Ocypoda arenaria) , whose carapace measured 

 1.5 inches in breadth, yielded 104 pupae, the living maggots being deposited by 



II flies on July 19 and the pupae removed from the bottom of 3 inches of sand 

 on July 29. Three imagoes had already emerged at that time and were 

 clinging to the bolting-cloth cover of the glass breeding-jar. 



In conclusion, it is a pleasure to give expression to my gratitude to Hon. 

 G. R. Putnam, U. S. Commissioner of Lighthouses, for permission to reside 

 in Eebecca Shoal Lighthouse, and especially to Mr. Lopez, the head keeper, 

 and his assistants, with whom I spent a very pleasant month. 



Report on the Bahama Cerions planted on the Florida Keys, by Paul Bartsch. 



It was hoped that a large number of adult specimens of the second genera- 

 tion of cerions would be present this year, but only 9 mature individuals of 

 this generation were obtained of Colony C, "White House type," and 2 of 

 Colony K, "King's Road type," on Loggerhead Key, Tortugas; yet these 

 specimens, though few in number, show that profound changes have taken 

 place in this generation. 



The shells at hand from both colonies are much smaller than those of the 

 first generation, and, what is more remarkable, even smaller than those of the 

 original planting. It is to be hoped that the coming year may yield a larger 

 number of this generation, or, at all events, enough for a thorough tabulation. 



It seems quite well established now that about 3 years are required to obtain 

 a full crop of a new generation, and it is to be hoped that we may yet be able 

 to make a new planting on a large scale, which will give us a much larger series 

 of offspring than we have so far obtained from our limited colonies. 



