very distinct species, although this was similar in color to the other, 
both being pale green. 
Found on Euphorbia maculata. Antennae longer than the body, 
very slender; the third and seventh joints very long; a few regularly 
placed hairs. Honey-tubes long and slender, reaching beyond the tip 
of the abdomen, newly one-third as long as the body, cylindrical. Tail 
verv distinct, ensiform and slender, about half the length of the honey- 
tubes. Wings with the sub-costal vein somewhat robust, diverging as 
it leaves the base so as to leave ihe widest space between it and the 
costal vein opposite the insertion of the first discoidal vein, then ap¬ 
proaching until it reaches it at the stigma; stigma elongate fusiform 
with the outer end long and pointed; third vein obsolete at the im¬ 
mediate base. 
The specific name euporbiae has been previously used in Aphis , but 
as this comes in Siphonophora, where the name has not been hereto¬ 
fore uSed, it will cause no confusion. 
Siphonophora Euphorbicola. Thos. 
The Margined—Spurge Aphis. 
Found September 1st., 1877, at Sioux city, la., on Euphorbia, marginata. 
Winged female .—Antenme long and slender, exceeding the bodv in 
length; legs very long and slender; general color a pale pea-green; 
honey-tubes very long, reaching beyond the tip of the abdomen, equal 
in length to about one-fourth of the body; wings very large and trans¬ 
parent. Head pale glaucus, the two lateral ocelli very prominent; eves 
dark; antennae dusky except the basal joints and the base of the third 
joint which are pale. Thorax with a slight purplish tint, prothorax 
green, abdomen pale green, legs hyaline except the knees and tarsi. 
Honey-tubes pale green at base, dusky at the tip; tail long, sword¬ 
shaped, slender, curving upwards, about half the length of the honey- 
tubes, greenish. Wings with slender but very distinct veins, which 
are dark or brownish except the costal and sub-costal which have the 
basal portion pale; veins very straight except the stigmatic which is 
strongly curved; stigma elongate, narrow and pointed at the ends, with 
the sides parallel. Beak extending to the hind coxae. 
Antenme similar t> those of S. rudbeckiaa with a few regularly 
placed alternate hairs. 
Length to tip of the body .09 of an inch; to tip of the wings .15 
inch. 
Wingless females. —E’ale green throughout except the eyes which are 
black; the antennae dusky except at the base; tips of the honey-tubes 
and the tarsi dusky; legs pale, transparent. 
I noticed a number of specimens which were covered over, especial¬ 
ly on the abdomen, with rounded tubercles, and with minute short 
hairs or cottony scales. These I took to be sexual differences. 
This species is very closely allied to S. cgparissiae Koch., but is 
distinct, as that has red eyes. 
It was quite abundant on the leaves and tender stems of Euphorbia, 
marginata. 
