62 SEVENTEENTH Report STATE ENTOMOLOGIST OF MINNESOTA—1918 
Biological characters. The type form of the tribe appears very 
much like a Macrosiphum, with which it has generally been associated 
by authors. The more fundamental characters prove it closely allied 
to the Callipterina. They are sporadic and all the generations acquire 
wings before reproducing, a condition known only for the Callipterina. 
They are found on the leaves of various deciduous trees. 
IV. Group TRICHOSIPHINA 
Westwood, 1890. Entom. Soe. Lond. Sub Siphonophora (genus). 
Schouteden, 1905. Spol. Zeyl. Vol. 2. Sub Greenidea (genus). 
Pergande, 1906. Entom. News, Vol. 17. Sub Trichosiphum (genus). 
Okajima, 1908. Bull. Tokyo, Vol. 8 Sub Trichosiphum (genus). 
Wilson, 1910. Ann. Ent. Soe. Am. Vol. 3. Sub Trichosiphini (tribe). 
Westwood (1890) described the first representative of the tribe 
which he placed in the genus Siphonophora. Schouteden (1905) pro- 
posed the genus for Westwood’s species. Pergande (1906) adds a 
second genus, Trichosiphum. Okajima (1908) describes additional 
species and suggests that the group perhaps represents a new subfamily. 
Wilson (1910) places the group as a tribe under the Aphidina. 
Morphological characters. Antennae variable in length and com 
posed of five or six segments; spur variable but longer than the prox1- 
mal part; antennae beset with long, spreading hairs as in Lachnina. 
Cornicles usually of the cylindrical type and very long and provided 
with long hairs like those on the body, antennae, and legs. Cauda 
short and triangular like the Aphidini. 
Biological characters. This interesting tribe seems to be confined 
to Asiatic countries, India and Japan, and is imperfectly known. All 
the forms so far made known are feeders on leaves of woody plants. 
The venation and long cylindrical cornicles would seem to place them 
close to the Microsiphini, but their exceedingly hairy cornicles and body 
indicate a still closer relationship to Lachnina. As the tribe does not 
come within our area it may be passed with only an indication of its 
position in the family. One tribe is known, the TrictostPHINI. 
V. Group APHIDINA 
Linnaeus, 1758, Syst. Nat. Ed. X. Sub Aphis (genus). 
Burmeister, 1885, Handb. Entom. Vol. 2. Sub Aphidina (family). 
Koch, 1854, Die Pflanzenl. Heft 1. Sub Aphiden (tribe). 
Passerini, 1863, Aphid. Ital. Sub Aphidinae (subfamily). 
Thomas, 1878, Bull. Ill. State Lab. No. 2. Sub Aphidini (tribe). 
Mordwilko, 1908, Acd. Imper. Vol. 13. Sub Aphidina (group). 
Linnaeus (1758) laid the foundation of the present group in the 
genus Aphis. Burmeister (1835) applied the term Aphidina to the 
