8 KANSAS UNIVERSITY SCIENCE BULLETIN. 



nation of the venation are not given, but are quite accurately 

 shown in accompanying illustrations. The location of color- 

 ation is generally designated with stipplings. On the caudal 

 margin of each large wing is a longitudinal fold by which the 

 caudal wing is held in the same plane with the cephalic one by 

 means of booklets. This fold allows a sliding motion of the 

 booklets, which also allows the wings to be brought cephalad or 

 caudad in the same plane, and at the same time firmly locked 

 together. For further information concerning the wings, see 

 descriptions opposite plate III. 



Tecliiiique. 



In the systematic study and collection of these insects the 

 author at first took no single method, but after experimenting 

 followed the ones herein mentioned as the most expedient and 

 beneficial. 



When collecting, bottles with large open mouths should be 

 carried. Cotton is used instead of cork stoppers. When speci- 

 mens are found, that part of the host-plant infested is detached 

 and put into the bottles with the insects in situ. The insects 

 will remain in a healthy condition when bottled in this manner 

 to enable one to transfer them to the laboratory, where notes 

 concerning their host-plant and also a brief description of 

 them can be taken. 



For the brief notes an especially prepared blank form is very 

 convenient and expedient. It also serves as a guide which 

 helps to insure against the omission of details. A type of this 

 blank is shown under the head of "Color Key." This should be 

 used for describing each fresh species, before it is treated with 

 any chemical. A cover-glass will hold the specimen in position 

 on the slide while the characters are noted by aid of a com- 

 pound microscope. 



After the specimen has been noted in the color key, some 

 typical forms of it should be permanently mounted on a slide 

 in balsam, and several specimens should be preserved in a vial 

 of formalin of a five-per-cent. solution or alcohol of a seventy- 

 per-cent. strength. The formalin is found to be superior in 

 many respects to the alcohol. 



In studying and classifying specimens, some typical forms 

 may be removed and dehydrated with alcohol ; only a few of the 



