4 SYNOPTICAL KEY TO THE APHIDIDAE OF MINNESOTA 141i 
the antennae long and apically enlarged, arrow-shaped, spoon-shaped, 
or finger-like ; sensoria are usually present on the third segment of the 
spurea; head strongly emarginated in front owing to large antennal 
tubercles, which are not swollen on the inner side, or very slightly so; 
cornicles long, stout, and cylindrical or swollen; reticulations on the 
cornicles continuous and forming cells or closed areas on the upper 
part ; cauda long and usually curved, with the hairs arranged in rows 
on the sides. This large tribe has usually been considered as the high- 
est development of the family, or more correctly, of the subfamily. 
The two subtribes may be separated as follows: 
a. With typical or normal venation and other characterss.......6.........- 
Subtribe MACROSIPHII 93 
be Vienation abnormal! more or less) aberramt) fons: 12 castes iets fen eile 
Subtribe PENTALONII 104 
93. Subtribe MACROSIPHII. Typical Macrosiphini with normal 
venation ; cornicles cylindrical or swollen. The subtribe may further 
be considered under two divisions based on the cornicles: 
aw Copniclesmeylindnical iaeniseG sce. ete Division CYLINDRICORNIA 094 
bajGognicles=swollenive vo. axit ee Done e td tse es Division CLAVICORNIA 102 
94. Division CYLINDRICORNIA. Cornicles cylindrical and usu- 
ally strongly reticulated; sensoria usually present and restricted to 
the third segment in both the spurea and the migrant. The genera of 
this rather large group may again be arranged in two groups: 
a. Cornicles short and with aphis-like reticulation; generalized forms...... 05 
b. Cornicles long and cylindrical with closed reticulations; typical forms..... 98 
95. Group Generalized Cylindricornia. Cornicles comparatively 
short and the reticulation often indistinct or broken as in the Aphidini. 
Two genera are represented in Minnesota: 
a. Cauda short and conical; cornicles short end not much longer than the 
CALI attra eee rraia i acce sic amnstaee chasse Genus MACROSIPHONIELLA 96 
b. Cauda longer and Aphis-like; cornicles longer than cauda............... 
Genus CATAMERGUS 097 
96. Genus MACROSIPHONIELLA Del Guercio, 1911. Type: 
Siphonophora atra Ferrari, 1872. A genus established by Del Guercio 
for certain Aphidini-like Macrosiphini, based on the short cone-shaped 
cauda and cornicles with aphis-like reticulation. 
(99) MACROSIPHONIELLA SANBORNI Gillette, 1908 
Found on chrysanthemum in greenhouses. 
97. Genus CATAMERGUS gen. nov. Type: Nectarophora fulvae 
Oestlund, 1887. The characters of the cornicles are similar to Macro- 
siphoniella, but the cauda is long and Aphis-like. 
