SAKBOHN : KANSAS APHIDID.K. 31 



a broad border of brown which also borders the subcostal vein. 

 This latter vein seems to arise distad of the second discoidal, 

 and from this point it gradually extends in breadth to the base 

 of the wing. There are ten booklets on this wing. The legs 

 are hirsute ; femora reddish yellow proximad, and the remain- 

 der of the leg black. The metathoracic legs are abnormally 

 long. The others are also long in proportion to the body. 



The abdomen is large and hirsute, having a grayish general 

 appearance. One lateral black spot on each tergura. Honey- 

 tubes are concolorous with the abdomen, and are as broad as 

 long, tuberculate, and 0,50 mm. long. The style is obsolete. 

 Entire length of the body, 7 mm. 



This form has been numerous here all summer. They are 

 gregarious and colonize the small limbs and trunks of trees. 

 They are very gentle and droll-like in their habits. In cold 

 weather they collect on the under side of the limbs, and insert 

 their beaks, which seem to support them when their feet become 

 too numb to support them. Even after they are dead they still 

 remain on the limbs clinging with their beaks. In endurance 

 of extremes of weather they are similar to the Schizoneura 

 lanigera. They were among some of the first winged forms to 

 appear this spring and were the last to disappear, having en- 

 dured all temperatures from — to zero, F. 



On account of their feeding habits they can live through the 

 winter where it gets no colder than zero, since they feed from 

 the sap of the tree and not from the sap of the leaves. This is 

 the largest aphid known. Following are the food-plants upon 

 which I have found it this year (1903) : Soft maple {Acer 

 (lasycarpum) , Pig hickory [Carya amara) , Black walnut {Juglans 

 nigra), oak (Quercus mar ij land i ca) , redbud [Cercus canadensis), 

 sycamore {Platanus occidentalis) , and cottonwood {Populus bal- 

 sam if era) . 



Subfamily APHIDIN^. 



Antennae seven-jointed, moderately long, often longer than 

 the body. Eyes present, with distinct ocular tubercles (ex- 

 cept in Callipterini) . Beak variable in length. Cephalic wings 

 with three discoidals ; third one twice branched ; stigmal vein 

 curved. Caudal wings with two discoidals. Legs generally of 

 a moderate length. Tarsi two-jointed and with two claws (ex- 



