SANBORN : KANSAS APHIDID.E. 9 



higher grades need be used. These may be siphoned off from 

 the insects after periods of thirty minutes each respectively. 

 Clearing mixture ^ is the next reagent added, in which the speci- 

 mens may remain fifteen minutes. From this they are removed 

 and arranged on slides with dissecting needles, and on them is 

 dropped xylol balsam over which a cover-glass is placed, but 

 not pressed. As soon as the balsam is dry the insects are suffi- 

 ciently cleared for study. The measure key*' is now used for 

 completing the characteristics not found in the color key. 

 When it is desired to recopy the descriptions the aphid theme 

 may be followed. This insures an orderly arrangement and 

 the omission of no characteristics. 



The accompanying illustrations were drawn with the camera 

 lucida in some instances from this kind of mount, but more 

 often from fresh specimens mounted by aid of no chemical otlier 

 than Canada balsam. 



Color Key. 



Underscore terms used. Blanks are to be used for qualifying terms and comments. 



Locality Date 



Ace. No Name 



Heid — black, green, brown Stigma — black, gray, brown 



Antennae — concolorous Femora — black, green 



Eyes — black, red Tibia — black, green 



Beak — concolorous. Tarsi — black 



Prothorax — black, green, brown Abdomen — bare, pulverulent, cottony... 



Thorax — black, green, brown Abdomen — green, black, brown 



Wings — deflexed, reposed Abdomen — other markings 



Wings — clouded, banded Honey-tubes — black, green, brown 



Veins — black, brown Style — black, green, brown 



Host-plant: Common name Genus Sp 



Parts aflfected — leaves, part, dorsal, ventral, marginal, petiole, twigs, frui', distal, 



proximal, trunk, roots, gall, pseudogall.. 



Habits — aerial, subterranean, sporadic, gregarious, viviparous, oviparous 



Comments: 



5. Clearinff mixture : Two parts by measure of carbolic acid crystals and three parts of rec- 

 tified spirits of turpentine. 



6. The color key and measure key should be printed on the same folder, for the sake of con- 

 venience. 



