form of the arc of a circle. Second fork of the third discoidal vein 
about equally distant from the apex and first fork. Wings are marked 
as reflecting a reddish color, and slightly smoky. Legs pale; joints 
and tarsi dusky. 
Wingless specimen. —Pale pea-green; antennas, head, honey-tubes and 
legs dull ochreous. Sides of the abdomen with darker green spots; 
transverse rows of white spots on the back or dorsal portion. Honey- 
tubes not extending beyond the tip of the abdomen, cylindrical. Tail 
prominent fully half as long as the honey-tubes; green. 
Genus DREPANOSIPHUM, Koch. 
HI 
il 
ri- 
f '4 J J * 
J 
This genus is characterized as follows, by Buckton : 
Rostrum short; penultimate joint long. Antennae long and fixed on 
the frontal tubercles; third joint longest ; fourth and fifth joints 
equal ; seventh setaceous, [and longer than any other except the third]. 
Honey-tubes large, curved and dilated in the middle. Legs moderate¬ 
ly long. Cauda (tail) inconspicuous or none. Wings long and narrow. 
Cubital (third discoidal) vein twice forked. Stigmatic cell elongated 
towards the apex of the wing; other veins parallel to each other or 
nearly so. The membrane slightly clouded toward the marginal ends 
of the veins. 
It is stated by Walker and others that there are no apterous, vivi¬ 
parous females in this genus, or in other words that all the females 
develop into pupae and thence into winged forms before they produce 
young. The habits of the genus are sporadic; large companies are 
not formed, but they collect under the leaves in little groups rarely 
exceeding five. 
I am not aware that any species of this, genus has been positively 
detected in this country, but it is more than probable that future ob¬ 
servations will bring one or more to light, i insert a description of 
D. acerina , Walk., as it is possible this is one of the species found on 
our maples. My Siphonophora acerifolia , which has been placed in 
that genus provisionally, agrees in several respects with the characters 
of Drepanosiphum , as for example the solitary habit, and I suspect 
also in the viviparous female being always winged. 
Drepanosiphum acerina, Walk. 
> 
Aphis acerina , Walk. 
Drepanosiphum aceris , Koch. 
Wingless viviparous female. —Length of body .07 inch, of antennae 
.10 inch, of honey-tubes .015 inch. 
