32 BULLETIN 826, U. S. DEPARTMENT OE AGRICULTURE. 
solitary upon the foliage of trees. Males winged. Oviparous female with a distinct 
elongated ovipositor and producing several eggs. 
Type (monotypical), Drepanosiphum acerifolii Thos. 
Genus DREPANOSIPHUM Koch. 
Plate IV, MM. 
1855. Drepanosiphum Koch, Die Pflanzenlaiise Aphidcn, p. 201. 
1885. Type fixation, Liechtenstein, Monographic des Aphidiens p. 175. 
Cornicles very long, quite distinctly swollen in the middle or subcylindric. An- 
tennse of six segments with short, scattered hairs and o\al or subcircular sensoria. 
Fore wings with the media twice branched. Hind wings with both media and cubitus 
present. Cauda knobbed, anal plate slightly indented. 
Forms living upon the foliage of plants, males usually winged. Oviparous female 
with a distinct elongated ovipositor. 
Type (fixed by Lichtenstein, 1885), Aphis platanoides Schr. 
Genus NEOSYMYDOBITJS, n. gen. 
The genus Neosymydobius is erected for species similar to that 
described as Symydobius alhasipJius Davis. It is evident that this 
species is not a Symydobius. Members of that genus are very large 
and differ in several ways. We place the present genus here with 
considerable doubt. 
Characters. — Cornicles small, truncate, Callipterus-like. Antennae of six segments 
which are armed with a few rather stout hairs. Fore wings with the media twice 
branched, hind wings with both media and cubitus present. Cauda knobbed, anal 
plate slightly indented. Forms living in colonies upon the foliage of trees. Body, 
particularly of the apterous forms, covered with rather stout spine-like hairs. Ovipar- 
ous female with a long ovipositor and depositing several eggs. Males usually winged. 
Type, Symydobius albasiphus Davis. 
Subtribe MONAPHIDINA. 
The subtribe Monaphidina, erected for the genus Monaphis, is very 
similar in most respects to the Callipterina, but lacks the cornicle 
dorsally. It seems evident that it is a specialization from insects of 
the Callipterus type in much the same way that Fullawaya is related 
to those of the Chaitophorus type. One genus only is known at 
present. ■ This differs more from the Callipterina than does Fullawaya 
from the Chaitophorina. 
Genus MONAPHIS Walker. 
1870. Monaphis Walker, The Zoologist, p. 2001. 
1894. Bradyaphis Mordwilko, Varshava Universitetskiia Izvicstiia, v. 8, p. 59. 
Few remarks on the synonymy of the genus Monaphis Walker are 
necessary as the same species was used as type in both cases men- 
tioned. The genus is a very remarkable one, being peculiar in many 
ways. 
Characters. — Cornicles faint; antennae of six segments, without distinct hairs, 
sensoria small and circular; cauda somewhat rounded but with an acute point or pro- 
jection; anal plate similar; fore wings with the media twice branched ; hind wings with 
both media and cubitus present. 
Type (fixed by Walker, 1870), Aphis cntennata Kalt. 
