68 BRITISH APHIDES. 



Genus XXIII.— TRAMA,* Heyden. 



WUEZELLAUS. ROOT-APHIS. 



Rostrum large, at least two thirds of the length of 

 the body. Much longer in the young. 



Antennae about half the length of the body, six- 

 jointed, excluding the apical unciform process; third 

 joint the longest, and about equal to the fourth and 

 fifth taken together. Fifth and sixth joints equal. 



Cornicles none, or mere pores. 



Legs long, particularly the hind pair, which possesses 

 only one long tarsal joint, which equals the femur in 

 length. The other tarsi two-jointed. Claws two. 



Tail inconspicuous. 



Eyes very small ; almost obsolete. 



The winged form has never been described, and its 

 existence was unknown to Heyden, Kaltenbach, and 

 Passerini. On the other hand, Walker says that the 

 insect " occasionally, but very rarely, acquires wings," 

 but he gives no authority for the fact.f 



Kaltenbach describes Trama in one place as having 

 seven antenna! joints, but in another only six. The 

 process at the end of the sixth joint appears to me to 

 have no greater claim to be regarded as an articu- 

 lation than that seen in Lachnus, which is quite as 

 much developed. 



Teama troglodytes, Heyden. Plate CII, figs. 5—7. 



Walk., Pass. 



Trama radicis, Kalt., Koch. 



,, lyuhescens, Koch. 



,, flavescens, Koch. 

 Aphis radicum, Goureau. 

 Ehizobius heUanthemi, Westw. 



* Derivation doubtful, 

 t Walker, op. cit., p. 1061. 



