SYNOPTICAL KEY TO THE APHIDIDAE OF MINNESOTA 143 
(108) MACROSIPHUM ROSAE (Linnaeus) Schouteden, 1901 
Found on roses; color green. 
(109) MACROSIPHUM PALLIDA (Oestlund) Sanborn, 1906 
A pink form found also on rose; this species has been re- 
described by Patch as pseudorosac. 
(110) MACROSIPHUM POTENTILLAE (Oestlund) Sanborn, 1906 
A pale brown form found on Potentilla. 
(111) MACROSIPHUM GERANII (Oestlund) Sanborn, 1906 
Found on geranium; a pulverulent form. 
(112) MACROSIPHUM FRIGIDAE (Oestlund) Sanborn, 1906 
Found on Artemisia frigida; color dark green. 
101. Genus ACYRTHOSIPHON Mordwilko, 1914. Type: Aphis 
pisi Kaltenbach, 1843. Sensoria few, arranged in a row and usually 
restricted to the third segment; spuria with only a few, 1-4, found on 
the base of the third segment. Large green or pale forms found on 
various plants, mostly herbs. 
(113) ACYRTHOSIPHON PISI (Kaltenbech) Mordwilko, 1914 
Found on various Legwmenosaec; color green. 
(114) ACYRTHOSIPHON GRANARIUM (Kirby) Mordwilko, 1914. 
Found on Graminaceae; color pale brown. 
(115) ACYRTHOSIPHON SOLANIFOLII (Ashmead) 
Found on cruciferous plants and potato. 
102. Division CLAVICORNIA. Cornicles very long and swollen, 
usually without closed reticulations except a few near the apex of the 
cornicles. At present a great many different forms are considered 
under one genus: 
a. Cornicles swollen; large Macrosiphum-like forms.....................-. 103 
103. Genus AMPHOROPHORA Buckton, 1876. Type: Ampho- 
rophora ampullata Buckton, 1876. A number of genera that Mord- 
wilko recognizes for the European fauna have not yet been applied to 
our American representatives. 
Ge) AMPHROPHORA NABALI (Oestlund) 
Found on Nabalus albus; a large and conspicuous form, with 
numerous small sensoria on segments 3 to 5 in the migrant. 
(117) AMPHOROPHORA SONCHI (Oestlund) 
Found on Sonchus oleracea; similar to nabali but with fewer and 
larger sensoria on the third and the fourth segments. 
(119) AMPHOROPHORA RUBICOLA (Oéestlund) 
Found on growing stalks of Rubus; sensoria restricted to the third 
segment. 
