170 INJURIOUS INSECTS OE 1903. 



Many more species, native to ^Minnesota, are undoubtedly yet to 

 be heard from. 



The fohowing observations may be of interest : C. stimulans 

 and A. macnlipcmiis abundant at Basswood Lake, Lake county, 

 ^lay i8th ; indivichials of the latter species numerous near the 

 lake, while the former were more abundant inland in the swamps. 

 C. consobriiius was fairly abundant April 26th, as was also C. iin- 

 pigcr. Both sfiiinilaiis and iiiipigcr were captured June 13th in 

 Douglas county. C. iiiipigcr was abundant in Itasca county June 

 20th. 



While in camp at Basswood lake in May the writer made a 

 few observations, necessarily somewhat crude, on the rate of 

 digestion in Aiiopliolcs iiianilipciinis, which may be of interest to 

 llie readers of this report. Mosquitoes which were allowed to 

 gorge themselves with blood and were then placed in a glass jar, 

 stoppered with absorbent cotton, required from 19 to 68 hours 

 to take care of what they had eaten. At the expiration of these 

 widely varying periods their abdomens had practically shrunk to 

 their normal size and the insects were read}' for business again. 

 None of the mosquitoes could be induced to bite a second time. 

 As is well known, one can allow this malarial moscjuito to bite 

 one with impunity provided it has not previously drawn the 

 l)l<)i)d of some victim of malaria. 



The growing interest in the anti-mosquito crusade, particu- 

 larly in the tasi. where associations are being formed for their 

 extermination and large sums appropriated for the work, indicate 

 that people are thoroughly a|)prcciating the fact that mosquitoes 

 are disease carriers and can l)c. in some localities, exterminated or 

 materially reduced in numbers. 



'i'he writer has stopped experimental work in a St. Paul 

 sul.urb in this connection, deeming the work t<^ have got beyond 

 the experimental stage, and calling for funds other than the state's 

 money for its prosecution. It might be said in reference to this 

 particular case that the area afifected was so extended, and some 

 of it so difficult of access, that, under the existing conditions, only 

 partial immunity could be assured without more extensive drain- 

 age, or the emplovment of a considerable force of men and the 

 expenditure of a large sum of money for labor, apparatus and oil. 



