99 
Aphis symphoricarpi. Thos. The Snow-berry Aphis. 
Found on the leaves of the Snow-berry (Symphoricarpus vulgaris) 
at Ft. Dodge, Iowa, September 1st. It inhabits the underside of the 
terminal leaves, causing them to curl, wither and die. 
Wingless individuals (no winged specimens observed.) 
There appear to be two varieties, or possibly the differences are 
sexual. The one pale transparent green, or yellowish green, eyes 
black, and a black ring around the antennae beyond the middle, and 
the tips dusky; the honey tubes, and a small space around the base of 
each, ocher-yellow; tarsi, and tip of the beak, black; legs pale trans¬ 
parent green; bodies broadly ovoid and very convex; abdomen very 
distinctly acuminate at the apex, but no tail apparent. 
The other variety is rather less convex, and the dorsal surface is 
more or less shaded with brown; in the darker specimens this color 
sometimes occupies most of the back; there is usually a median line or 
stripe of green on the posterior half of the abdomen, which can often 
be indistinctly traced to the thorax; the thorax generally more or less 
shaded with pale brown; tip of the abdomen usually pale or greenish, 
and not acuminate as in the other variety; tail distinct but short, 
whitish; honey-tubes dark at the tips; remainder, and a space around 
the base, yellowish-brown. 
Legs rather short. Antennae reaching to the honey-tubes, or nearly 
to the tip of the abdomen; honev-tubes very short, almost reduced to 
tubercles, length about twice their diameter. 
Aphis middletonii. Sp. nov. 
• * 
m * • m 
This species, which is found in abundance during autumn and win¬ 
ter, on the roots of iron-weed, aster, and perhaps other plants, and 
which was discovered by me last November, is somewhat anomalous. 
And, although it is exactly what I have imagined for some time I 
would find, yet it appears no less anomalous when it is found. I can¬ 
not designate, with any certainty, the plant it chiefly infests, and 
hence am liable to lead astray by using a name indicating a particular 
plant or genus of plants. I have, therefore, named it in honor of 
Mise Nettie Middleton, who has been my constant assistant in the 
study of the Aphides, and to whose care and skill I am indebted for 
all the mounted and otherwise prepared specimens; who also has done 
a very large share of the microscopic work, and has assisted in de¬ 
scribing and verifying a large portion of the speeies mentioned. 
Wingless female, (no winged specimens observed).— General color 
of the body a leaden gray, with very little variation; antennae a lit¬ 
tle lighter than the body, with the tip of the fifth and wftole of the 
sixth joint* dark; legs the same color as the body, with the knees and 
tarsi dark; honey-tubes darker than the body, though having a leaden 
hue; tail the same* color as the body; eyes black; beak with a brown¬ 
ish shade, tipped w r ith black. This appears to describe the typical 
individuals, which seem to be fully developed; but the shading varies 
from this almost to white, and if the 6ties hereafter mentioned be¬ 
long to the same species, then to white. 
