47 
of being grooved. Honey-tubes very long, usually extending beyond 
the tip of the abdomen, and sometimes equaling in length one-third 
of the body, cylindrical and nearly always straight, never enlarged in 
the middle, orclavate. The tail distinct, more than usually long and 
large, generally curved slightly upward. Legs very long and slender. 
The wings erect in repose, the front wings with three discoidal veins 
and a forth or stigmatic vein; the third discoidal vein twice forked; the 
stigmatic vein curved and rather short. Hind wings with two ob¬ 
lique veins. All the species known present winged individuals. The 
males are always winged, the oviparous females is never winged: the 
winged individuals usually seen are viviparous females, the males being- 
rare. The males usually have smaller abdomen, larger wings and longer 
antenna* than the winged females. The genus contains a large num¬ 
ber of species. 
Siphonophora Acerifolije. (Thos.) 
Aphis, inhabiting the leaves of the soft maple. 
I first observed this singular species on the leaves of the soft 
maple [Acer dasycarpum) Fort Dodge, Iowa, during the past sum¬ 
mer. Subsequently I received specimens from Peoria collected by Miss 
Emma Smith, and from St. Louis, collected by Mr. Pergande. I am in¬ 
clined to think it is quite commonly distributed wherever the soft 
maple is found, but has heretofore been overlooked. Although quite 
numerous it does not appear to be massed in colonies, but is found 
scattered over the leaves, somewhat resembling in its habits the 
Psylla, to which in fact it makes the nearest 'approach of any species 
of Aphididw with which I am acquainted. Observed in the winged state 
September 1st and 2d. 
Fig. 11. 
It will probably require the formation of a new genus for its recep- • 
tion, as it has some some strongly marked characters not found in other 
species of Siphonophora. 
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