REPORT ON MOSQUITOES. 235 



but the Newark swarm was traced to Summit and Morristown, 

 and may have extended further. 



In 1904 marsh conditions favored the early brood and unusual 

 swarms developed on the Raritan, Elizabeth and Newark 

 meadows early in May; indeed the favoring conditions extended 

 all along- shore so that by May loth the whole marsh area was 

 awing, except along the Shrewsbury, where the work done by 

 the Monmouth Beach and Rumson Neck Associations completely 

 annihilated the immense brood that was developing. The ditches 

 were completed just in time to do their work. At New Bruns- 

 wick the swarm arrived May 12th, and extended onward. At 

 Newark the invasion was almost unprecedented and compelled 

 the closing of stores in some cases. This swarm not only reached 

 Paterson, but covered the Garret Mountain, where Messrs. 

 Dickerson and Grossbeck found them swarming June nth. It 

 was reported further that it had extended to Bernardsville, which 

 is well up in the hills, and far enough back to be beyond the reach 

 of ordinary migrations. So in the Pines, cantator reached 

 Lahaway May 17th, weeks ahead of the 1903 record. 



Further details of this character will be found under the gen- 

 eral heading "Migrations" on a previous page. 



There is one feature in which cantator differs from the other 

 migratory forms, i. e., both sexes fly together for some distance 

 and occasionally females with developed ovaries are found far 

 from any point where they can deposit them with any hope of 

 development. The males are seen for a day or two only, but 

 they arrive with the females and are evidently able to stand a 

 flight of several miles at least. In Newark and Elizabeth both 

 sexes may be taken on first arrival in equal numbers ; at New 

 Brunswick the males are numerous enough to "dance" in small 

 swarms just at dusk. From Lahaway no males have been sent 

 and my records are not sufficiently complete to give the limit of 

 male flight. 



While, as has been noted, occasional females with developed 

 ovaries are found at some distance from shore, yet this is a 

 feature only in the early arrivals ; i. e., they occur during the 

 week or two after a flight and disappear, none being found 

 during the later days of the brood's stay. Whether they make 

 their way back to the marshes to oviposit, or whether they lay 

 their eggs in the most likely place to be found, is not definitely 

 known. As the percentage of sucli females is larger in Newark 

 and Elizabeth than in New Brunswick, it is quite probable that 

 many find their way back, and as an occasional brood of the larva 



