( 4 ) 
Tribe 1. APHIDINI. 
Genus Siphonophora, Koch. 
Antennae very long, on tubercles ; honey tubes long, cylindrical. 
1. Siphonophora acerifoliae, new sp. 
Winged , viviparous female. General color light grey, varied with 
white and ash-brown. Antennae extending beyond the tip of the 
abdomen, nearly to the tips of the wings. The three ocelli distinct. 
Prothorax with depressed, expanded lateral margins. From the back 
of each of the first three or four abdominal segments, arise two distinct, 
slender, somewhat curved spines. Honey-tubes not extending beyond 
the tip of the abdomen. Most of the veins of the front wings, es- 
pecially the fourth and the forks of the third, expand at the tips, forming 
dusky spaces ; the subcostal vein is strictly parallel with the costa ; 
stigma short and rather small. 
Basal joints of the antennae dull yellowish, with a narrow darker ring 
at the apex of the third and fourth joints; more or less of the fifth of a 
transparent whitish color, forming an annulus ; sixth and seventh 
dusky. 
Head pale brownish, with a narrow white median line ; eyes red ; 
prothorax same color as the head, with more or less distinct, very nar- 
row, abbreviated, longitudinal white lines ; abdomen marked with a 
few white dots somewhat regularly arranged, powdered with white 
behind the honey-tubes. The white lines and spots appear to be 
formed by a very fine white powdery substance. The spines 
on the abdomen black. Honey-tubes brown, white at the immediate 
tips. 
Apterous individuals, ( probably not fully grown. ) Pale pea-green ; 
eyes dark ; apical portion of the antennae dusky ; tibiae dusky at the 
base ; honey-tubes pale green. The surface of the body smooth and 
shining. 
Found on leaves of Acer dasycarpum , chiefly on the under 
side, somewhat sporadic and not aggregated in large colonies. Winged 
specimens very active and apparently capable of leaping. Slightly 
above medium size, but less than JS. rudbrckiae. 
It is possible that this Aphis should be placed in Drepanosiphum , or 
a new genus be formed for its reception. 
2. Siphonophora rudbeckiae, Fitch. Senate 30, 66, 1851. 
On Rudbeckia laeiniata, Ambrosia trifida , and Solidago serotina. 
3. Siphonophora ambrosiae, new sp. 
Similar in size and appearance to S. rudbeckiae , but varying in color 
from a light brown to a dark seal brown. 
Winged individuals. Discoidal veins of the front wings strongly 
curved. Antennae passing the tip of the abdomen, light brown, dark 
at the apex. Honey-tubes long, cylindrical, reaching beyond the tip 
