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Uroleucon impatiensicolens

Rufous jewelweed aphid

On this page: Identification & Distribution Other aphids on the same host

Identification & Distribution

Adult apterae of Uroleucon impatiensicolens (not pictured) are reddish brown to bronze-brown with black siphunculi and a pale cauda. Their antennae are about as long or somewhat longer than the body. The longest hairs on segment III are less than the basal diameter of that segment. The last rostral segment and the second hind tarsal segment are much shorter than antennal segment I. Uroleucon impatiensicolens appears rather hairy in life. Hairs on abdomen are in in transverse rows, each hair having a small dorsal tubercle at its base. The hind femora have the basal half light colored, contrasting with the dark apical half. The first tarsal segment has 5 hairs. The siphunculi are 1.2-1.4 times as long as the cauda, with the distal 0.3-0.4 reticulated (cf. Macrosiphum euphorbiae, Macrosiphum pallidum and Macrosiphum impatientis, which all have siphunculi 1.4-2.2 times the length of the cauda, with the distal 0.13-0.23 reticulated). The cauda is elongate, with 13-21 hairs. The body length of adult Uroleucon impatiensicolens apterae is 2.5-3.6 mm.

Both images above by permission, copyright Claude Pilon, all rights reserved.

Alatae of Uroleucon impatiensicolens (see two pictures above) are similarly coloured to the apterae. They have dark brown, distinct marginal sclerites on abdominal segments II-IV and the postsiphuncular sclerites are entire. The cauda is pale to dusky. Immatures (see picture below) are also similar to the adult apterae, but have paler legs and siphunculi.

Image above by permission, copyright Claude Pilon, all rights reserved.

Uroleucon impatiensicolens is found on jewelweeds (Impatiens) species in north-eastern North America (Canada, USA).


Other aphids on the same host

Uroleucon impatiensicolens has been recorded on 2 species of Impatiens (Impatiens capensis, Impatiens pallida).


We are grateful to Claude Pilon for pictures of Uroleucon impatiensicolens (for more of her excellent pictures see).

Identification of specimens photographed by Claude Pilon was confirmed by Eric Maw by microscopic examination and DNA analysis of preserved specimens. For taxonomic details we have used the accounts of Patch (1919) and MacGillivray (1968) together with information from Roger Blackman & Victor Eastop in Aphids on Worlds Plants. We fully acknowledge these authors and those listed in the reference sections as the source for the (summarized) taxonomic information we have presented. Any errors in identification or information are ours alone, and we would be very grateful for any corrections. For assistance on the terms used for aphid morphology we suggest the figure provided by Blackman & Eastop (2006).

Useful weblinks


  • MacGillivray, M.E. (1968). A review of twelve aphid species described as new by Edith M. Patch. Annals of the Entomological Society of America 61(2), 338-362. Abstract

  • Patch, E.M. (1919). Three pink and green aphids of the rose. Maine Agr. Exp. Sta. Bull. 282, 205-18. Full text