404 AGRICULTURAL EXPERIMENT STATION. 



at Sewell's Point, who had in early July swept mosquitoes out 

 of his rooms by the thousands, reported that since the ditching 

 was completed they had had very little trouble. 



September 9th, adults w^re very numerous, but no gravid 

 females were seen and explorations were carried along the pike 

 to Bennett's Station. Syk'cstris now began to come to the 

 porches, but in small numbers. Collections and notes were made 

 until the i6th, when a terrific gale with rain following supplied 

 iresh water to all breeding places. On the 17th brood 7 was 

 found in the pools in small numbers, and from the facts reported 

 it seems likely, though Mr. Viereck does not say so, that these 

 were left-over eggs from the sixth brood. In the evening, gravid 

 females of sollicitans, salinarius, tmiiorhyncJms and crucians 

 were taken around the electric light. By the i8th the larvae had 

 been eaten up in the hsh-stocked pools, even where only a few 

 had survived the drought. A new brood of Anopheles crucians 

 had started September 19th in the Cape Marsh. 



September 24th, Lake Lily at Cape May Point was again 

 examined and found free from mosquito breding areas. Several 

 times during the summer this lake had been carefully looked over 

 and on each occasion the record was the same. It might not be 

 safe to say that absolutely no mosquitoes developed in it during 

 the year; but the water is well stocked with fish, and aquatic 

 insects are present in great abundance, so that only in a few 

 grassy shallows is breeding possible. The salt marsh species 

 simply cannot live there at all. At this fag end of the summer 

 mosquitoes were very abundant and crucians, unlike the others of 

 its genus, was troublesome even during the day. 



The larvae of brood 8 were found in pools on September 28th 

 and 30th, and this ended the work of the season for Mr. Viereck. 

 Egg-laying was very active at that time, gravid females being 

 plentiful ; yet most of them with only a very partial supply of 

 eggs, indicating that oviposition had been in progress for some 

 time. The majority of these ova were probably the provision 

 for a 1904 supply. 



The practical value of the work done by Mr. Viereck can 

 scarcely be overestimated, and elsewhere in this Report will be 

 found more detailed records of his observations and conclusions. 

 Not the least interesting of these are on certain parasites and 

 predatory forms which materially lessen the numbers of mos- 

 (|uitoes at certain periods. 



