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Mordvilko's Keys for the Determination of Aphids living continuously or temporarily on Graminaceous Plants and Sedges

Published online by Cambridge University Press:  10 July 2009

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Extract

[The systematic keys to the species of Aphids that attack Graminaceae, recently published by Mr. A. K. Mordvilko (Bull. Petrograd Div. Sta. Protect. Plants from Pests, iii, no. 3, 1921, 72 pp., 19figs.) are likely to be of considerable value to students of these injurious insects, and it seemed desirable that they should be translated from Russian into English. The original keys are very lengthy, and therefore Mr. B. P. Uvarov has kindly condensed them, and they have then been translated, under his supervision, by Miss F. B. Constable, of the Imperial Bureau of Entomology. Mr. F. Laing, of the British Museum, has also kindly assisted with advice in regard to certain technical points.—Ed.]

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 13 , Issue 1 , April 1922 , pp. 25 - 39
Copyright
Copyright © Cambridge University Press 1922

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References

page 25 note * Aphids of this tribe are not yet known on graminaceous plants.

page 30 note * If “Siphocoryne” splendens, Theo., found in Egypt (Gizeh, 18.ii.08) on wheat, is near to Aphis padi, L., owing to the structure of the cornicles and other characters it is in any case distinguished by having fairly long hairs on the antennae and legs (in A. padi the hairs on the 3rd joint of the antennae hardly exceed half the diameter of the joint, whereas in “Siphocoryne” splendens, to judge by Theobald’s illustration, they are at least equal to the diameter; besides this, the cornicles in A. padi are decidedly shorter than the 3rd joint of the antennae, while in S. splendens they are longer (cf. F.V.Theobald,1915).

page 35 note * T. D. A. Cockerell has described from Colorado (N. America) several species of Forda, found in ants' nests (Psyche, x, 1903, pp. 216–218), but the descriptions are insufficient to enable the species to be included in this key.

page 36 note * In southern France and Italy several species of Pemphigella, Tullgren, 1909, have been described as producing galls on Pistacia. In Transcaucasia and Turkestan so far only two species have been observed: P. follicularia, Pass., and P. utricularia, Derbes. But in the remaining forms, with the exception of P. follicularia, migrantes have not been bred on roots of plants. J. Lichtenstein found that Aploneura lentisci migrates to roots of Graminaceae (Hordeum vulgare, Bromus mollis), but he did not give a description of the apterous viviparous ♀♀ which develop there (C.R. Acad. Sc. Paris, lxxxvii, 1878, pp. 782–783).

page 36 note † In the relative lengths of the joints of the antennae this species resembles F. kingi, Ckll. (Psyche, 1903); but in the latter the body is dark greyish to green, the whole body and extremites seldom hairy, but the cauda with hairs. N. America (Colorado); on roots of Graminaceae in ants' nests.

page 39 note * The disposition of the glands (from above only four longitudinal rows are visible, and not all six) suggests that this species may belong to the tribe SCHIZONEUREA. The settlement of this question is impossible without a more detailed description of the groups of glands.

page 39 note † It may be that the N. American species (Colorado) from ant nests, Tychea lasii, Ckll., and crassa, Ckll. (Psyche, 1903) are closely related to this species.

page 39 note ‡ T. pallidula, Cockerell (Psyche, 1903) from N.America, in which the 3rd joint is longer than 1st, is distinct from this species.