124 NINETEENTH REPORT STATE ENTOMOLOGIST OF MINNESOTA—IQ22 
(20) CHAITOPHORUS DELICATA Patch, 1913 
Color pale with transverse bands on the abdomen; larvae whit- 
ish; this small and delicate little species is found on Populus den- 
tatus and willow. 
(21) CHAITOPHORUS QUERCICOLA Monell, 1879 
Veins of wings with dusky bends; larvae with stout brown or 
black spines; found on the leaves of oak. 
29. Supertribe APHIDEA. Abdomen short and broad and 
abruptly rounded posteriorly, rarely elongated; antennae usually as 
long as or longer than the body with spur much longer than the basal 
part; sensilla usually short and spinelike; cornicles rather stout and 
much longer than broad, sometimes distinctly swollen in the middle, 
or again very small and inconspicuous; cauda distinct and usually 
triangular with a clear area near the base. Migration from winter 
habitat, usually some tree, to more succulent herbs for the summer 
and again returning to the winter habitat for ovipositing is rather 
common in the group. Two tribes are represented: 
a. Cornicles very short and small, usually shorter than the cauda......... 
Tribe. HYALOPTERIND 3a 
b. Cornicles longer than the cauda (with some exceptions) and cylindrical 
or swollen; body short and legs moderately long....Tribe APHIDINI 34 
30. Tribe HYALOPTERINI.. The, Hyalopterini -are “quite wa 
large assemblage of genera, which should be held distinct from the 
Aphidini proper, as representing a more primitive line of develop- 
ment in which the cornicles are very short and weak (not reduced). 
The body 1s more or less elongated and pulverulent ; antennae shorter 
than the body; rostrum and legs short. Three genera are present in 
Minnesota : 
a. Living exposed or in crumpled leaves; migrating from plum to Phrag- 
ABVUBG Sri sea cg eee ane = Rey nt Ry Genus HYALOPTERUS 31 
b. Living in closely folded, pod-like leaves on Chenopodium albus.......... 
Genus HAYHURSTIA 32 
c. Living exposed on cruciferous plants and on cabbage; cornicles slightly 
swollen” 253 0...e sea sum oon eR Pee Genus BREVICORYNE 33 
31..Genus HYALOPTERUS Koch, 1854. Type: Aphis prunt 
Fabricius, 1775. Secondary sensoria in migrant scattered and present 
on the third and fourth segments; cornicles short and slender, slightly 
narrower basally. 
(22) HYALOPTERUS PRUNI (Fabricius) Koch, 1854 
Found on plum and during the summer on Phragmuites. 
