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NOTES ON ISOSOMA ELYMI, French

Published online by Cambridge University Press:  31 May 2012

G. H. French
Affiliation:
Carbondale, Ill.

Extract

In my notes in the March number of the Can. Ent., the idea is conveyed that this species obtained from the wild Canada rye grass, may prove to be identical with the wingless form obtained by Prof. Riley and myself from wheat stalks, and which Prof. Riley has since named in the American Naturalist, I. Tritici. At the same time doubt was expressed as to their identity, because at the time of writing there were still larvæ in the grass straws, while I. Tritici pupated in the fall, both in the breeding jars and in the field. Since the article mentioned has appeared, I have obtained from my grass stalks several more specimens, and I believe the two forms to be entirely distinct. A specimen was sent to Prof. Riley, upon the receipt of which he wrote as follows:

“It is undoubtedly distinct from I. Tritici, as is shown not only by the greater length, stouter body, darker color of the antennal scape and constancy of the winged form, but also by the punctuation (most markedly), by the shape of the mesothoracic scutum, and by the color of the mesoscutar parapsides. It comes in fact nearer to Hordei than to Tritici, though, as you say, it is well distinguished from the former by the punctnation.”

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1882

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