SANBORN : KANSAS APHIDID^. 17 



lated the sensoria are circular. Eyes large in the winged form, 

 but in the gall-inhabiting, apterous form they may be small or 

 absent. Beak long in the adult, or absent in the true sexes. 

 Thorax generally well arched. Wings moderately long. The 

 third discoidal is simple and hyaline or obsolete at the base. 

 The first and second discoidals usually start from the same 

 point or not far apart. The caudal wing has two discoidals 

 (except in Hormaphis, which has but one), which arise from 

 an angle in the subcostal vein. Legs short; tarsi with two 

 claws and sometimes with a pair of capitate hairs. Honey- 

 tubes obsolete. Style inconspicuous or none. 



Genus Hormaphis Osten-Sacken.^'^ 



Antennte five-jointed ; first and second short, third the lon- 

 gest, fourth and fifth subequal ; the last three joints strongly 

 annulated. Eyes conspicuous. Beak moderately long. Front 

 wings with two discoidals starting from the same point ; the 

 third discoidal is simple and almost obsolete at the base. Hind 

 wings with a single discoidal which is almost obsolete. Legs 

 moderately long; tarsi mounted at the distal part with two 

 long capitate hairs. Honey-tubes and style absent. 



Genus Tetraneura Hartig. 



Antennse short, extending nearly to the abdomen ; the third 

 joint distinctly annulated. Beak short. Wings with a simple 

 cubital which is obsolete at its base ; stigma large and trape- 

 zoidal ; the first and second discoidals usually arise at the same 

 point. The subcostal vein of the caudal wing with only one 

 discoidal. Legs short. Honey-tubes and style obsolete. 



Genus Geoica Hartig." 



Antennae five-jointed, not annulated ; first and second joints 

 short ; third longest ; fourth and fifth shorter, subequal, often 

 connate, the fifth with a short, thick spur at the tip. Sensoria 

 present on the third antennal joint of the winged individual, 

 and in all of the forms at the apex of the fourth joint and base 

 of spur on the fifth, the latter sensorium lunate in the wingless 

 individuals. None present on the tibia of the oviparous fe- 

 male. Eyes distinct. Beak rather short and thick, last two 



10. No representative of this genus described in this text. 



11. No representative in text. 



2-BulJ., Vol. Ill, No. 1. 



