190 
joints taken together; seventh joint as long as the fourth and fifth 
taken together. Length 2.28—2.78 mm.; to tip of wings 3.81 mm. 
“On Sonchus oleracea. July, St. Louis, Mo.” . 
I think there is no doubt, but that this is a variety of that ex¬ 
ceedingly variable species, S. sonchi Linn. If Buckton is correct in 
the synonyms he gives, there is scarcely a constant specific character; 
even the smooth dorsum and yellowish tail are found in some varie¬ 
ties, although Buckton relies on the opposite conditions as character¬ 
istics; also every shade of color from green to brown, and from brown 
to red; some are marked with rows of tubercles and some are smooth. 
The tubercles on the antennae, do not distinguish Mr. Monell’s species 
from the former. S.jaccoe , Linn, is in all probability, a variety of this 
variable species. 
Stphoxophora calendula. Monell. 
“Apterous individuals —General color, brownish black; dorsum smooth 
and shining, a little reddish towards the honey-tubes. Legs yellow, 
except the knees, tarsi, and apex of the tibiae, which are jet black. 
Honey-tubes black subcylindric, very long. Style yellow, slender 
acute, two-thirds as long as the honey-tubes, or a little less. 
Winged individuals: General color black; head and thorax slightly 
fuscous. Antennae black, half as long again as the body; third joint 
as long as the sixth and fifth taken together, very slightly tubercular: 
the following joints not so. Honey-tubes slightly fuscous toward the 
apex. Wings hyaline. Length 2.28-3.04 mm.; to tip of wings 3.81- 
4.56 mm. » 
“On stems of Calendula micrantha; June and July, St. Louis, Mo.” 
S I PlI O X O PIT ORA RUDBECKEE. Fitch. 
Mr. Monell adds the following lists of plants on which this species 
has been taken, Vernonia novaeboracensis V. Lindheimeriana , Solidago 
rigida , S. serotina , IIidem chrysanthemoides , Ambrosia trifida , Cirsium 
arvense , Silphium perfoliatum , 8. integrifolia , Cacalia suaveolens , 
When large numbers of this species make their appearance in a lo¬ 
cality, as is sometimes the case, they may be found on almost every 
plant in the vicinity, apterous as well as the winged, and very often 
with their beaks employed in pumping up the sap. I observed them 
in excessive numbers at Sioux City Iowa, in 1877 on the fiats west of 
the city, near the banks of the little stream which here enters the 
M issouri. The numbers were so excessive, that many large plants 
were entirely covered, leaves and stems; I found them evbn on the 
Cances in the vicinity, and other plants they are not in the habit of 
infesting, but as a matter of course few in number, and although often, 
as stated, pumping the sap, but evidently dissatisfied with their food 
and location as shown by^ their movements. 
