SANBORN : KANSAS APHIDID.E. 



11 



Prothorax 



Thorax^ MTiif"*^ 

 ' Metathorax 



Color. 



Lateral tubercle8. 

 Color. 



f Color. 



! Venation )S°'°'-i-f 

 Wings I I Normality. 



I Stigma ^«°gth 

 I ^ / Breadth. 

 l^ Total expansion. 

 I Color. 

 Legs -j Covering. 

 ( Normality. 



Color. 

 Tubercles. 



Honey- tubes 



Abdomen < 



I Color. 



I Shape. 



■{ Length. 



I Length in relation to metatarsi. 



i Length in relation to the body. 

 (' Color. 

 I Covering. 

 Style i Shape. 

 I Length. 



1 Length in proportion to honey-tubes. 

 Total length of body. 



f When found 



(E-ology I Host-plants j g^^^V^'*- 

 , *•' 1 *^ / Position on. 



l^ Habitat. 



The Wax OlaiuLs. 



In aphids which secrete a waxy or woolly material there are 

 certain glands in which the secretion is elaborated. 



Some forms of plant-lice attract a great deal of attention on 

 account of a flocculent material which seems to grow out from 

 their bodies like the wool on sheep. Huber says that ants are 

 known to keep a stock of "cows and goats." And his meta- 

 phor was not far-fetched, because from the habits of certain 

 ants with aphids this statement is in one sense true. Although 

 it is not known that the aphids use the "goats" as a com- 

 modity of any greater industry than they do the "cows." In 

 fact, the wool does not seem to be of any particular use to them. 



Is this wool an outgrowth of the epidermis? There seems to 

 be only one brief answer on this point in former publications. 

 And in this the author defines the secretion as being "forced 

 through chitinous rims to cup-like glands, the glands arranged 

 in clusters four to six or seven in a cluster, and each composed 

 of numerous cells." From this it appears that the material 

 does not grow out of the epidermis as hair or wool, but that 

 there are certain glands which are situated near the epidermis 

 that elaborate this so-called secretion. 



