Florence E. Jarvis 43 



Detailed Notes on the finding of Immature Stages of Culicidae, 



TOGETHER WITH PREVIOUS RECORDS OF THE OCCURRENCE OF 



Anopheles, in London. 



1 . Anopheles maeulipennis, M. 



Keston, upper pond. Large and shallow, with grassy edges except 

 at one end; weed mainly Elodea, but not growing very thickly; numerous 

 small fish, aquatic beetles, Gammarids, and pond-skaters. Visited 

 30. vii. 1918; wind E., hot and dull. Eggs and young larvae 

 numerous. 



Peckham Rye Park. Series of small artificial ponds with flowering 

 water-plants and a considerable quantity of green algae. The water is 

 supplied by a tap which is turned on at intervals of a few weeks, or more 

 frequently during dry weather. Grass at edges kept closely cut; at 

 elevation of 100ft or less. Visited 2. iv. 1918, when no larvae were 

 found. Examined again 9. viii. 1918; wind W. to N.W., warm and 

 sunny; 7 young larvae found; also 2 larvae of Culex jnpiens. 



Telegraph Hill Park, New Cross. Artificial pond with water-lilies, 

 clumps of rushes, and long grass hanging into water from banks. No 

 larvae found on 5. vi. 1918. On 10. viii. 1918, wind N.W., 4 half-grown 

 larvae. 



Southend, near Catford. Reedy swamp on the course of the river 

 Ravensbourne, near Southend Pond. Close to main road, at no great 

 distance from houses ; becoming partly dried-up in summer ; considerable 

 quantity of duckweed; fish present; water clear. Visited 23. xi. 1917, 

 29. iv. 1918, and 4. vi. 1918, without finding any larvae. On 10. ix. 1918, 

 strong W. wind, with heavy showers at frequent intervals ; level of water 

 raised owing to recent heavy rain; one young larva found and pupae, 

 from one of which a male emerged the following day. 



Bexley Heath, S.E. of Woolwich. Larvae in clear water of permanent 

 swampy ground with hoof marks, some duckweed, and no fishes ; cattle 

 near at hand, also trees; houses within 100 yards; 27. ix. 1917, bright 

 sunshine, temperature 65°; obs. Mrs A. Macdonald (B. Mus. Map, p. 20). 



Erith, E. of Woolwich. (1) Larvae in permanent ditches on Picardy 

 Manor Way — swampy ground, where one ditch spreads out after rain 

 and with muddy pools in the course of the other; water clear, but with 

 some weed in both cases; no fishes seen, a few water-scorpions present; 

 houses within 50 yards; road frequented by children; no cattle near. 

 (2) Larvae in shallow part of a permanent ditch in the marsh, with clear 

 water, some Spirogyra, no fishes seen; houses within \ mile; cattle 



