SYNOPTICAL KEY TO THE APHIDIDAE OF MINNESOTA 137 
juglandis, which was followed by the genus Lachnus. Monell aimed 
to suppress the term Myzocallis altogether. There is undoubtedly a 
place for Myzocallis and it should be retained, but Koch’s Callipterus 
should be applied to tiliae and not to juglandis. 
(80) CALLIPTERUS TILAE (Linnaeus) Walker, 1868 
Not known from Minnesota bui may be looked for on Tilia. 
78. Genus PTEROCALLIS Passerini, 1860. Type: Aphis alni 
DeGeer, 1773. - Antennae about as long as the body; spur .of the 
terminal segment slightly shorter than the base; anal plate slightly 
emarginated; radial sector indistinct basally, and anal vein with a 
distinct bulla on the base of the vein. 
(81) PTEROCALLIS ALNI (DeGeer) Passerini, 1860 
A rather small delicate form found on the leaves of Alnus. 
79. Genus MYZOCALLIS Passerini, 1860. Type: Aphis coryh 
Goeze, 1778. Antennae usually much longer than the body ; basal part 
of the terminal antennal segment not elongated, and the spur equal 
to or commonly much longer than the base; stigmal vein usually in- 
distinct on basal part. The following species are known from Min- 
nesota : 
(82) MYZOCALLIS DISCOLOR (Monell) Wilson, 1910 
Cornicles black; wings mottled with brown arezs. 
(83) MYZOCALLIS ASCLEPIADIS (Monell) Wilson, 1910 
Cornicles yellow; wings with brown areas. 
(84) MYZOCALLIS PUNCTATUS (Monell) Wilson, 1910 
Wings clear; spur slightly longer than base. 
(85) MYZOCALLIS WALSHI (Monell) Baker, 1917 
Wings clear; spur nearly twice the base in length. 
(86) MYZOCALLIS BELLUS (Walsh) Thomas, 1879 
Wings with black border; spur nearly twice the bese in length. 
80. Genus TUBERCULATUS Mordwilko, 1894. Type: Aphis 
quercus Kaltenbach, 1843. Abdomen with dorsal tubercles; spur 
shorter than base. 
(87) TUBERCULATUS ULMIFOLII (Monell) 
Common on leaves of elm; a small, pale, delicate form. 
81. Tribe DREPANOSIPHINI. Antennae much longer than the 
body; cornicles longer than broad, enlarged basally; abdomen with 
dorsal tubercles. One genus is known from Minnesota: 
ay houndsoneleavesvor. soft maple... a.m. sec aes Genus DREPANAPHIS 82 
