SANBORN : KANSAS APHIDID.E. 13 



It may be bare, hirsute, or tufted with setiv or fiocculeut ma- 

 terial. Houey-tubes absent. Style absent or inconspicuous. 

 These species are subterranean in habit and live on roots, and 

 are found with ants. 



Genus Tychea Koch.'^ 



Antenna^ composed of five joints, almost equal in length, the 

 third a little the longest. Eyes none or very rudimentary. 

 Beak variable in length according to age, but rather long and 

 thick. Not known to acquire wings. Legs short. Honey- 

 tubes, none. Style almost obsolete or none. 



Genus Trama Heyden.^ 



Antennae about one-half the length of the body, six-jointed, 

 including the unguis ; third joint the longest, and equal to the 

 fourth and fifth together ; fifth and sixth joints equal. Eyes 

 very small and almost obsolete. Beak about two-thirds the 

 length of the body. Not positively known to acquire wings. 

 Legs long, particularly the hind pair, which possesses only one 

 tarsal joint, which is equal to the femur in length ; the other 

 tarsi are two-jointed. Honey-tubes and style inconspicuous. 



Genus Forda Heyden.'* 



Antennii? five-jointed, the third joint the longest. Eyes very 

 small. No winged forms known. Abdomen convex. Honey- 

 tubes absent. This genus has eyes and antenntie more simple 

 than Trama. It feeds on grass roots and is often found in ants' 

 nests. 



Genus Rhizobius Burmeister, Plate IV, figs. 25 and 26. 



Antennae five-jointed, the first four nearly equal in length. 

 Eyes inconspicuous. Beak very short, rising between the first 

 coxa3. No winged form known. Legs short, the tarsi termi- 

 nated with but one claw. Body has a coating to some extent 

 of flocculent material. Honey-tubes and style absent. Differ- 

 ent authors do not agree on the number of joints of the anten- 

 nae. Passerini says six. Fitch five or six, Thomas seven, and 

 Buckton adds that the characters are very inconstant. This 

 genus is subterranean in habit and lives on the roots of plants. 



7. Although all the gonera given do not have representatives in this text, it is nevertheless 

 thought best to give the former that have been found in America. 



8. No representative in text; genus? sp. 



