Chromaphis juglandicola (Small walnut aphid)
Adult viviparae are all winged. Fourth instar nymphs (first picture below) are yellowish white, and (in autumn) have paired brown spots on abdominal tergites 4 and 5. The alates (second picture below) are yellowish-white with pale brown thoracic lobes and paired brown spots on abdominal tergites 4 and 5. The antennae have dark brown tips and are about half the length of the body; the terminal process is 0.2 times the length of the base of the last antennal segment. The siphunculi are conical and smooth. The body length of alates is 1.2-2.3 mm.
The small walnut aphid lives scattered on the undersides of leaves of walnut (Juglans regia). Oviparae and males occur in May-June in India, and in autumn in Europe and the USA. It is found in Europe, Central Asia, India, Pakistan, China and North America.
- Dixon, A.F.G. & Thieme, T. (2007). Aphids on deciduous trees. Naturalist's Handbooks 29. Richmond
- Stroyan, H.L.G. (1977). Homoptera: Aphidoidea (Part) - Chaitophoridae and Callaphidae. Handbooks for the identification of British insects. 2 (4a) Royal Entomological Society of London. Full text