" English Mechanic and World of Science," No. 2781, July 12, 

 1918, p. 283, in which he said 44 that the Anopheles bijurcatus, 

 which is a malarial-carrying- mosquito, is the only species of which 

 the larvae survive the winter in England, and any mosquitos found 

 up to the end of May will most probably be of this species. The 

 larvae are fairly common all through the winter months in ditches 

 near Bournemouth, and are also to be met with in rainwater tubs 

 which contain much vegetable debris. By May these larvae have 

 all developed. Early in June the very small larvae of both 

 Anopheles maculipennis and Anopheles bijurcatus, hatched from 

 newly deposited ova, are easily met with in their proper habitats. 

 The larvae of the two species may be distinguished by the arrange- 

 ment of the hairs on the elypeus and the imagines by the wings 

 of A maculipennis being spotted, while the wings of A. bijurcatus 

 are spotless. The larvae of A., bijurcatus are to be met with in 

 ditches which contain a fair amount of water, the larvae of 

 A. maculipennis in shallow patches of water, in the grass border- 

 ing the edges of country roads, and more especially in shallow 

 pools in shady portions of forest-ground, notably in parts of the 

 New Forest in Hampshire " . 



The first expedition was on March 2, when adult gnats 

 (Culices) only were found. From that time onwards searches were 

 made weekly. 



The first larvae of Anopheles maculipennis were taken by Mr. 

 H. B. Wells and Dr. Penrose from the fresh-water lake in Poole 

 Park on June 4. From that date onward until the middle of 

 September larvae both of A. maculipennis and of A. bijurcatus have 

 been found in great numbers not only in Poole Park, but in many 

 other permanent ponds and ditches in which there was much vege- 

 tation and which were overshadowed by trees. 



In the open unshaded pools which are scattered through the 

 heather districts no larvae were found, although repeatedly 

 searched for. 



The larvae of both species have been found, as stated above, 

 in the fresh-water lake in Poole Park. Elsewhere only one or 

 other of the two species have been found in any given piece of 

 water. The district explored was from Highcliff on the east right 

 round Poole Harbour to the west as far as Studland. Wherever 

 the conditions are favourable apparently throughout the area the 

 larvae are to be found. In Bournemouth proper, owing to the very 

 few suitable breeding areas, mosquitos (Anopheles) are not very 

 common, though there are a good many gnats (Culices). No 

 member appears to have come across A. plumb eus (ni gripes). 



The following members have assisted in the research : — Mr. 

 Belcher, Mr. Chaffey, Mr. and Mrs. Grace, Dr. Penrose, Mr. 

 Waddington, Mr. Wallace, Mr. Wells. 



F.G.P. 



