368 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 10 



dent physicians were consulted relative to the occurrence of malaria in 

 the vicinity and blood smears were examined wherever available. 

 Public lectures, previously scheduled, were frequently given, usually 

 illustrated with local material. Perhaps the most noteworthy lecture 

 given during the summer was that at Redding before the state con- 

 vention of County Supervisors. This was well attended and evi- 

 dently well received. Hundreds of copies of the State Board of Health 

 Special Bulletin No. 9 on "Malaria and Mosquito Control" by the 

 writer were distributed. In most of the seriously infested localities 

 a house-to-house distribution was made. 



Results of Survey with Comments 



We now have without doubt a very complete collection of the species 

 of mosquitoes occurring in northern California and by the time the 

 survey is finished a unique representative collection of these insects 

 will be at hand such as few if any of the larger states possess. The 

 specimens are being properly mounted and a card index of localities is 

 being prepared so that information relative to the occurrence of mos- 

 quitoes in a given locality can be quickly and accurately ascertained. 

 Our knowledge of the geographical distribution of the Anophelines has 

 been greatly amplified. One or more of the specimens of Anopheles 

 was encountered in all but one northern California county, and we 

 were able to find numerous specimens of Anophelines, also located 

 their breeding places, at an elevation of 5,482 feet (this at Sierra ville) . 



We are even more impressed than ever that the Anopheles mosquito 

 as a real menace to health does not wander far from its larval habitat, 

 and that with the discovery of Anophelines their breeding place may 

 be located within a very few rods of this point. 



The chief source of Anophelines was quite commonly the green 

 scum-covered edges of a small receding stream, creek or irrigation 

 ditch, or grassy weed-grown pool of clear water. While the Anopheles 

 mosquito may breed in vile stagnant water, it prefers clear, fairly cool 

 water such as one frequently finds in smaller streams with sandy or 

 pebbly bed. The current may be fairly swift in one part of the stream 

 but the edges are commonly shallow and left-over scum-covered pools 

 occur nearby. 



While the survey has revealed the fact that Anopheline mosquitoes 

 are more widely distributed than was at first believed to be the case 

 and that consequently the malaria menace is also greater, we are no 

 less positive in our belief that malaria can be brought under control. 

 It is, however, a matter of detail, intensive rather than extensive. 

 For example, a small overlooked pool of water, originating from a 

 tiny stream beneath a fruit-packing house, may produce ample Ano- 



