TypHa Insects: THEIR EcotocicaL RELATIONSHIPS 501 
| Kansas. Frequently the young aphids were found behind the sheaths 
‘of the leaves, in the gelatinous material below the surface of the water 
‘in which the plants were growing. 
Rhopalosiphum diantht Schrank 
Rhopalosiphum dianthi Schrank was reported on cat-tail by Sanborn 
(1906). 
| Rhopalosiphum persicae Sulz. 
Rhopalosiphum persicae Sul. was reported on Typha latifolia and on 
'T. angustifolia by Wilson and Vickery (1918). 
Aphis gossypwt Glov. 
Aphis gossypii Glov. is found in small numbers on Typha latifolia 
during the spring and fall, according to Davidson (1917:65). 
Macrosiphum granarium Kirby 
Macrosiphum granarium Kirby, the grain aphis, is found in great 
numbers on Typha during the summer and fall, according to Davidson 
(1917:65). 
Hyalopterus arundinis Fab. 
Hyalopterus arundinis Fab., according to Davidson (1917:65), is found 
from April to June. The infestation on cat-tail is never large. There 
are four to ten generations. Aphids settle mainly on both sides of the 
blades, locating in colonies, usually not far from the tips. 
HYMENOPTERA? 
Five species of parasitic Hymenoptera were reared on insects which 
were found on cat-tails. 
Aleiodes intermedius Cress 
Aleiodes intermedius Cress was reared on larvae of Arsilonche albovenosa. 
On August 12, 1916, six specimens emerged from one larva, 
9 Determined by C. F. W. Muesebeck, 
