SYNOPTICAL KEY TO THE APHIDIDAE OF MINNESOTA 125 
32. Genus HAYHURSTIA Del Guercio, 1909. Type: Aphis 
atriplicis Linnaeus, 1761. Secondary sensoria in migrant in a row on 
the third segment of the antennae; cauda rather long and slender. 
(23) HAYHURSTIA ATRIPLICIS (Linnaeus) Del Guercio, 1909 
Found in podlike folds of the leaves on Chenopodium. 
33. Genus BREVICORYNE Van der Goot, 1915. Type: Aphis 
brassicae Linnaeus, 1758. Cornicles slightly swollen in the middle 
and short ; secondary sensoria in migrant, numerous and scattered on 
the third segment of the antennae. 
(24) BREVICORYNE BRASSICAE (Linnaeus) Van der Goot, 1915 
Found on cruciferous plants and on cabbage. 
34. Tribe APHIDINI. The Aphidini have the body usually short 
and rounded posteriorly ; antennae usually about as long as the body, 
with spinelike sensilla, which rarely are long and hairlike; cornicles 
cylindrical or swollen, stout and often wider at base and tapering ; 
reticulations on cornicles in broken lines; cauda obvious, triangular, 
and usually with a clear area at base. Found on leaves of trees or 
more commonly on herbs. This is the largest tribe in the family, 
rich in genera and species. Two main divisions may be recognized : 
a, Commoles- ey hinchacei ll Jac docuucpcsueodoc Division CYLINDRICORNIA 35 
MB GGERGLES * SWONMENIS, «ro. os. ulate: oreid o Ors Sa teheyeha'v os Division CLAVICORNIA 55 
35. Division CYLINDRICORNIA. Cornicles stout, cylindrical, 
usually much longer than the cauda; reticulations on the cornicles 
broken or disconnected lines. The genera of this large division may 
further be divided into three groups: 
a. Antennae provided with long, slender hairs like those found in the 
Ghaitophoncar swe eae horse ee The CHAITOPHOROIDES group 36 
b. Sensilla on the antennae short, str2ight and spinelike hairs............... 
The APHIS group 4o 
c. Similar to the preceding group but showing some marked aberrant cher- 
acter as reduced venation or antennal segments, tarsal characters, 
SCO ici ERR ay REUSE hg ee ae ania ay et ee The TOXOPTERA Group 
36. The CHAITOPHOROIDES group. Mordwilko separated a 
rather large aphis form with the body and appendages provided with 
I 
On 
long, slender hairs like those of the Chaitophorea under the generic 
name Chaitophoroides. We have several similar forms in America, 
not all of which can be placed in Mordwilko’s genus. Three genera 
of the group are at present known from Minnesota: 
a. Secondary sensoria in migrant 15-30, rather large; pulverulent glands, 
when present, in dorsal longitudinal rows; cornicles cylindrical....... 
.Genus CHAITOPHOROIDES 37 
