148 NINETEENTH REPORT STATE ENTOMOLOGIST OF MINNESOTA—I9Q22 
123. Genus SCHIZONEURA Hartig, 1837. Type: Aphis lanigera 
Hausmann, 1801. Eriosoma was used by Leach in a broad and loose 
sense, contrasted with Aphis and is equivalent to Pemphiginae as a 
subfamily name. “‘Eriosoma has its body covered by wooly matter ; 
its abdomen has neither horns nor tubercles, and its antennae are short. 
The body of Aphis is naked, and the abdomen is furnished with a 
tubercle, or hotnlike process on each side.” (Trans. Hort. Soc. Lon- 
don. Vol. 3, 1820). Schizoneura and Pemphigus have been accepted 
by most writers since the time of Hartig, and have gone so extensively 
into the literature, that it would be to a considerable disadvantage to 
change it now on the slight claim that Leach may have for his Erio- 
soma. The following species are found in Minnesota : 
(128) SCHIZONEURA LANIGERA (Hausmann) Hartig, 1841 
Rather common on apple; the winter form is the rosette on Amer- 
ican elm. 
(129) SCHIZONEURA AMERICANA Riley, 1879 
Folding the leaves of elm from the sides. 
(130) SCHIZONEURA RILEYI Thomas, 1879 
Found on the trunk in crevices or injuries on elm. 
124. Tribe FORDINI. Cornicles wanting; media of fore wings 
simple; hmd wings with two transverse veins. Found in nests of ants 
and underground on roots. None are known from Minnesota, but 
Forda with five segments to the antennae, and Geoica with six, may 
be looked for. 
125. Tribe TETRANEURINI. Media simple or with one branch; 
fundatrix with four segments to the antennae ; migrant with five or six ; 
no cornicles present. Found in galls and on roots of plants. The 
following genera are found in Minnesota: 
a. Media simple; hind’ wings with one transverse vein...<1 05... ..5.:+ 05.0 5- 
Genus TETRANEURA 126 
b. Media with one branch; hind wings with one transverse vein........... 
Genus COLOPHA 127 
c. Media with one branch; hind wings with two transverse veins............ 
Genus MELAPHIS 128 
126. Genus TETRANEURA Hartig, 1841. Type: Aphis ulmi Lin- 
naeus, in part, 1758. Media of fore wings simple; hind wings with 
only one transverse vein; found in galls on Ulmus. 
(131) TETRANEURA ULMI (Linnzeus in part) Hartig, 1841 
Found in small galls on European elm; not known from Minnesota. 
