THE VICTORIAN NATURALIST. 87 



Microscopic Section — continued. 



Mr. F. Chapman, A.L.S., recent foraminifera. 



Rev. W. Fielder, F.R.M.S., development of an eye, 



Mr. J. Gabriel, pond life. 



Mr. A. D. Hardy, pond life. 



Mr. J. F. Haase, entomostraca. 



Mr. C. Hallam, pond life. 



Mr. W. J. M'Caw, biological preparations. 



Mr. J. Shephard, pond life. 



Mr. J. Stickland, pond life. 



Mr. W. Stickland, pond life. 



Messrs. W. Watson and Sons, various choice mounted objects. 



Wild Flowers.— Exhibits were made by — 



Miss Bainbridge. 



Miss S. W. L. Cochrane, from Beaumaris. 



Mr. Geo. Coghill, from Quambatook and Ultima (Mallee district), Mans- 

 field, Bayswater, Beaumaris, and Bairnsdale. 



Messrs. C. French, jun., C. Walter, and G. Weindorfer, from Dandenong 

 Ranges. 



Mr. C. M. Maplestone, from Eltham. 



Mr. J. T. Paul, from Grantville. 



Mr. W. Scott, from New South Wales. 



Dr. C. S. Sutton. 



Miss G. Wisewould, from Gembrook. 



MOSQUITOS AND DISEASE. 



By Georgina Sweet, M.Sc. 



(Communicated by G. Sweet, F.G.S.) 



{Read before the Field Naturalists' Club of Victoria, 8th Sept., 1902.) 



[abstract.] 

 The increasing evidence of the connection between mosquitos 

 and many blood diseases renders the study of these pests both 

 necessary and interesting. Further, a knowledge of their habits, 

 their Hfe-histories, the invariable relations of some forms with 

 such diseases, and of the numerous side issues therefrom, is 

 rendered now much more readily obtainable since the long 

 labours of many working in tropical and sub-tropical regions, 

 some of whom have lost their lives in the investigation. I am 

 greatly indebted for information derived from the works of Mr. 

 F. V. Theobald, Dr. P. Manson, and Dr. T. O. Howard, also Dr. 

 Nuttall, and others. 



The general external features of these six-footed, two-winged 

 " flies " are well known — the head with sensory appendages, thorax 

 with walking appendages and wings, and the abdomen ; the 

 piercing and sucking mouth and proboscis, through which 

 passes out the poison which assists the suction of the food, the 

 great variety of scale structure, and the conspicuous venation 

 of the wing, are characteristic structures. 



The main genera so far known to be connected with disease 

 are — Anopheles with malaria, Culex with filariasis, and Stegomyia 



