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SOME PLANT-LICE AFFECTING PEAS, CLOVER, AND LETTUCE*

Published online by Cambridge University Press:  31 May 2012

E. Dwight Sanderson
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Extract

The “Green Dolphin” is one of the best-Known pests of peas and vetches in Europe, though but little concerning its economy has been recorded by European writers. In this country, N. pisi, Kalt., has been noted by Thomas, Oestlund, and Williams, but as their specimens were never compared with any from Europe, and as plant-lice are exceedingly variable and descriptions of them are, therefore, often of but little value even when accurate, the identity of their specimens with the European forms has been somewhat in doubt.

Type
Articles
Information
The Canadian Entomologist , Volume 33 , Issue 2 , February 1901 , pp. 31 - 39
Copyright
Copyright © Entomological Society of Canada 1901

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References

1 Thomas, 8th Rept. St. Ent., Ill., p. 64 (1879).

2 Oestlund, Bull. No. 4. Goel, and Nat. Hist. Surv., Minn., p. 82 (1887).

3 Williams, Spec. Bull. No. 1, Univ. Nebr., Dept. Ent., pp. 6, 9, 18, 20, 23 (1891).

4 W. G. Johnson, Bull. No. 20, n. s., Div. Ent., U. S. Dept. Ag., pp. 94–9 (1899).

5 W. G. Johnson, Canadian Entomologist, XXXII., pp. 55–60 (Feb., 1900).

page 33 note * Measured from figure—probably inaccurate. () Partly computed by writer.

6 The full bibiliography of the species appears in the Report of the Del. Coll. Ag. Exp. Sta. for 1900. Aphis ulmariæ, Schrank, is undoubtedly the same species and several writers have preferred to use that name. Schrank's description, however, is not clearly recognizable, and I have preferred, therefore, to follow the majority of writers in using Kaltenbach's name. Exception might be taken to this usage, as very many aphids are not to be recongnized from the original description of the species, but where types are not extant for purposes of comparison it would be much better were such descriptions discarded.

7 Thomas mentions it in Illinois in 1879, but it is doubtful whether his description applies to this species.