72 AGRICULTURAL EXPERIMENT STATION. 



spines, and the patch of scales. It will present only a confused 

 mass as to the rest of the body. Pupa shells from which adults 

 have emerged may be mounted in the same way. 



Anopheles larvae, when they are found in the trap pails or 

 tubs, should not be removed except for preservation until they 

 are nearly full grown. Experience has shown that they do not 

 develop well in the laboratory in small jars. When about ready 

 to pupate they may be brought in and dealt with as in the Culex. 



Except for the Anopheles and the two species of Culex 

 already mentioned. I have never found larvae in my trap pails, 

 no matter how plentiful other species might be. 



Adult mosquitoes should be caught with a fine gauze net taper- 

 ing to a long point. Just at dusk, when they begin to be trouble- 

 some on porches, they are easily seen and as easily caught with 

 the net. From the net the individual can be transferred at once 

 to the killing bottle or jar, or a number of specimens may be 

 caught in succession by constantly keeping the caught specimens 

 in the apex of the net by means of occasional jerky swings and 

 allowing the long point to drop over the rim of the net. During 

 the day, or when collecting in the woods, the net is easily 

 managed, and with a very little practice a mosquito may be 

 caught and transferred to a bottle absolutely uninjured. These 

 collections made in the various localities are of great practical 

 value, because they determine positively just what species are to 

 be dealt with, and our present knowledge enables us to determine 

 with reasonable certainty just where their breeding places are to 

 be sought. 



Where specimens are to be collected in a sick room for deter- 

 mination, or in a house under any circumstances, a tumbler with 

 a wad of cotton having a good dose of chloroform is needed. 

 The cotton must be fastened to the bottom so as not to fall out 

 when the glass is inverted, and such a trap may be readily used 

 with a little practice to capture mosquitoes sitting on side walls 

 or low ceilings. Where specimens are out of convenient reach, 

 a tin can fastened to a light stick may be used ; but it will require 

 a little practice to handle and place it over the insect without 

 scaring it off. The chloroform acts very promptly and will 

 stupify almost immediately, so that the specimen may be trans- 

 ferred unharmed to a vial or pinned, as desired. 



Where larvae are to be collected, with either the idea of deter- 

 mining the species or of breeding as many forms as possible from 

 any one locality, the collector needs a supply of wide-mouthed 

 bottles to hold his larvae, a small beaker or thin glass holding 

 about four ounces, a small net frame, six by eight inches in 



