748 



A. E. Verrill — The Bermuda Islands. 



vious occasions, but if so it may, perhaps, have died out in some 

 years during the cool winter months, for it is a tropical species. 

 At least the mature winged insects probably all, or nearly all, 

 die during winter, while the larva? may live through the winter in 

 the water-tanks to give rise to a new brood in summer. This will 

 account for the cessation of vellow fever here in winter, as in the 

 southern United States, while it may prevail through the whole year 

 in more tropical countries. It is largely a nocturnal species and par- 

 ticularly fond of concealing itself among furniture, draperies, etc., 

 but it will also bite viciously in the daytime. 



It is recorded by Theobald (Monog. Culicidae, i, p. 288, 203, pi. xiii, 

 figs. 49, 50), as having been collected here in July, 1899, by Dr. 

 Eldon Harvey. It is found in nearly all tropical countries, especially 

 near the coast. Its range is exactly coincident with the distribution 

 of yellow fever. Its habit of concealing itself in close rooms 

 and in the cabins of vessels enables it to migrate to all warm countries.* 



The open water-cisterns are ideal places for the breeding of these 

 mosquitoes. In the brackish marshes the abundant minnows, gold- 

 fishes, eels, and dragon-fly larva? tend to reduce their numbers. 



Crane-flies or Tipulidce, which are not numerous, are yet repre- 

 sented by several species, all undetermined except Dieranomyia dis- 

 tans Osten Sacken,f originally described from Florida. 



J. M. Jones recorded in 1870 the following additional Diptera, not 

 observed by us : Trypeta humilis Loew (Monog. Dipt. N. Amer., i, 



Deaths from Yellow Fever in the City of Havana. 



* On page 511, note, it is erroneously stated that Mr. Theobald records only 

 Culex from Bermuda. When that chapter was written I had overlooked his record 

 of Bermuda as a locality from which Steyomyia fasciata had been received and 

 also his determination of Culex fatiyans. 



I Monograph Diptera North America, Part IV, p. 67. 



