86 
IOWA ACADEMY OF SCIENCES. 
Expanse of wings, 4-92mm; length of body, 1.827mm; width, 1mm 
length of antennse, .70mm. Joint III, two or three sensoria; IV, V and 
VI, one each. Other characters as in Schizoneura on Setaria. 
Apterous viviparous form; length of body, 2mm; width, 1.36mm; length 
of antennae, 0.65mm; no sensoria on joint III, in some cases one on IV, one 
each on V and VI. Body distinctly ovate. 
The apterous form found late during the fall of ’93 on roots 
of Drop seed (Muhlenbergia) and early in the spring of ’94 on 
ants’ nests are distinguished by being nearly twice as large as 
apterous forms found on annual grasses, by having the thorax 
margined and provided with a spine, by having very indistinct 
eyes, by the remarkably long rostrum which reaches to nearly 
the middle of the abdomen, and by having a rather large blunt 
cauda. This probably corresponds with what is generally 
described as Tychea. 
From the results obtained thus far and the observations 
made by the senior author in 1889% also from the description as 
given as well as from those given by Dr. Thomas’ and Prof. 
Forbes*”’ for Schizoneura panicola; it seems that there must be 
two distinct root forms of Schizoneura infesting grasses. The 
true Schizoneura corni occurring mainly on roots of perennial 
grasses from June 15th to October, and the form found 
in the ground at all seasons. The former is characterized 
further by having the habit of the brood next to the last migrat- 
ing from the grass roots to Dogwood and depositing a brood of 
wingless males and females on the leaves, the females deposit- 
ing their eggs on the rough bark. The eggs hatch about the 
middle of May. We have observed that the first brood feeds 
upon the tender stems, base of leaves and in flower clusters in 
Dogwood. This fact was noted in 1891% also by Kaltenbach% 
The second brood, as far as observed, feed together in the 
flower clusters until full grown, when they develop wings and 
migrate from June 1st to 15th, undoubtedly to perennial grasses, 
and locate upon the roots. The latter, the form described by 
Dr. Thomas as Schizoneura iKinicola, occurs throughout the 
whole season on roots of annual grasses. Whether this should 
be considered a distinct species we think still an open question. 
From the facts gathered in 1889 it was thought to be identical 
^Osborn. U. S. Dept, of Ag , Div. of Ent., Bull. No. 22, pp 32-41. 
5Thomas. Eighth Keport, St. Ent., 111., pp 1.31-139. 
6Forbes. Thirteenth Report, St. Ent., Ill , 1884, pp 51-54. 
^Osborn. U. S. Dept of Ag., Div. of Ent., Bull. No. 26, p 59. 
SKaltenbach. Monographie der Famlien der Pflanzenlause, p 168. 
