Trises oF APHIDIDAE 59 
sidered it as a section under the subfamily Pemphiginae. DelGuercio 
(1900) characterized the tribe Vacunides under the subfamily Pem- 
phiginae. Mordwilko (1908) considers it as the group Vacunina 
under Pemphiginae. Wilson places it as the tribe Vacunini in the 
subfamily Callipterinae. In the present paper it is considered as a 
tribe in the group Chaitophorina. 
Morphological characters. Antennae short, not much longer than 
the head and thorax combined; five segmented but often a six seg- 
mented condition is found in one or both the antennae of certain in- 
dividuals; spur of the terminal segment very short, Rostrum short 
and stout. Wings held flat in repose; media one-branched; hind 
wings with only one oblique vein. Cornicles very short, extending 
but slightly above the surface of the body. Cauda short and rounded, 
or when longer then enlarged at apex or globate. 
Biological characters. Small size. Found on smaller twigs and 
sometimes on the leaves of woody plants as birch, alder and dogwood. 
The tribe is remarkable in the extent of reduction that has taken place 
in the antennae, cornicles and venation, in convergence with the sub- 
family Pemphiginae. 
tik Grover CALEIP PE RINA 
Koch, 1854. Die Pflanzenl. Heft 1. Sub Drepanosophiden et Callipteriden. 
Passerini, 1863. Aphid. Ital. Sub Aphidinae et Lachninae (subfamilies). 
Thomas, 1879. Report 8. Sub Siphonophorini et Aphidini (subfamilies). 
Oestlund, 1887. Bull. 4. Sub Callipterini (tribe). 
Mordwilko, 1908. Ann. Acd. Sei. Vol. 13. Sub Callipterina (group). 
Wilson, 1910. Can. Entom. Vol. 42. Sub Callipterini (tribe). 
Koch (1854) recognized the two tribes Drepanosiphiden and Cal- 
lipteriden, both of which are nomena nuda. Passerini (1863) dis- 
tributes the genera under the subfamilies Aphidinae and Lachninae, 
and Thomas (1879) under the tribal names Siphonophorini and 
Aphidini. Oecestlund (1887) united the present group with the Chaito- 
phorina under the tribal name Callipterini. Mordwilko (1908) first 
recognized the group under the term Callipterina. Wilson (1910) 
considers the same under the tribal name Callipterini. 
Morphological characters. Antennae variable in length, spur like- 
wise ; never hairy as in the preceding group; secondary sensoria usually 
confined to the basal half of the third segment, arranged in a row; 
marginal sensoria often scattered or found in a row close to the pri- 
mary. Rostrum short or at most moderately long. Venation typical; 
the stigmal vein often reduced, at least the basal part. Cornicles short 
and truncate like those of the Chaitophorina, rarely short cylindrical or 
