Trripes oF APHIDIDAE 61 
secrete an abundant white wax substance in tufts or bands that give 
them a very peculiar appearance, and may serve as a protection against 
some of their enemies. 
7, tren CALEIPTERINT 
Kkoch, 1855. Die Pflanzenl. Heft 7. Sub Callipterus (genus). 
Mordwilko, 1908. Ann. Acad. Sci. Vol. 183. Sub Callipterini (tribe). 
Wilson, 1910. Can. Entom. Vol. 42. Sub Callipterini (tribe). 
Koch (1855) erected the first genus of the tribe. Mordwilko 
(1908) included most of the genera under the tribal name Callipterini. 
Wilson (1910) uses the term Callipterini in the sense of our Callip- 
terina including the three tribes here distinguished. 
Morphological characters. Front not deeply emarginate nor with 
frontal tubercles ; antennae usually as long as or longer than the body ; 
spur shorter than, equal to, or much longer than the proximal part of 
the segment. Venation normal, but stigmal vein often indistinct, at least 
the basal portion. Cornicles short and truncate, sometimes much re- 
duced or wanting. Anal plate usually deeply emarginate, sometimes 
bilobed. Larval forms with distinct glandular hairs on the body. 
Biological characters. Vhe Callipterini have long been favorites 
with students of the family. Most delicate in structure and extremely 
variable in color and organization they have also been a favorable hunt- 
ing ground for the genus makers. They are found almost exclusively 
on leaves of deciduous trees. 
SRE DRE PAIN © Sip EEENi 
Koch, 1854, Die Pilanzenl. Heft 1. Sub Drepanosiphiden (tribe). 
Oestlund, 1887, Bull, 4. Sub Callipterini (tribe). 
Koch (1854) recognized the tribe under the name Drepanosi- 
phiden which is a nomen nudum. Oecstlund (1887) considers it under 
the tribe Callipterini. 
Morphological characters. Front more or less concave as in the 
Macrosiphini but the antennal tubercles are not large. Antennae as a 
rule much longer than the body; the extreme length seems to have been 
reached in this tribe of the family; spur of the terminal segment ex- 
ceedingly elongated in comparison with the basal part which is short 
and not elongated as is usual in the Callipterini. Cornicles vary from 
short to long, and usually variously enlarged, departing from the cylin- 
drical form. Cauda short and conical or even globate. Anal plate 
more or less emarginate. 
