120 
intercostal cell is not perceptible, the costal and snb costal veins ap¬ 
pearing as if connate, while in others the exterior basal angle of the 
stigma is not so far back as the base of the cubitus. The distance 
between the apex of the upper furcal andthat of the stigmal vein, 
is equal to about one-third of the distance between the tips of the 
furcals. 
Since the above was written, I have found this Lachnus living 
in great abundance on the underside of the branches of Linden, a 
few miles west of St. Louis. The apterous specimens do not differ in 
coloration from the winged ones. The newly born larvael have the 
head, thorax and legs yellowish and the abdomen greenish.’ 1 (Monell.) 
Genus PHYLLAPHIS. Koch. 
This genus is very similiar to Lachnus. The third discoidal vein of 
the front wings is twice forked; the fourth, or stigmatic vein, is 
slightly curved but not so distinctly as in Callipterus ; the stigma is 
trapezoidal, but narrow, approaching Lachnus'm this respect. The 
antennae short, scarcely extending beyond the end of the thorax; spur 
of the sixth joint sub-obsolate. Body broad behind and wooly. Only 
one species has been placed in this genus, the Aphis fagi of Linnaeus, 
which is found on the beech. 
Phyllaphis fagi. The Beech Aphis. 
The winged female is of a bright green color; thorax dark green; 
abdomen with alternating, dark and light green, transverse stripes; eyes 
red; legs dull yellow; head and prothorax yellow; abdomen yellowish 
with interrupted, greenish, transverse stripes; antennae and legs yellow¬ 
ish. (From Koch’s figure.) 
genus SIPHA. Pass. 
i 
This genus resembles Aphis so closely that it is unnecessary to 
mention any characters, except the one in which it differs from that 
