S. Mahunka szerk.: Folia Entomologica Hungarica 43/1. (Budapest, 1982)

FOLIA ENTOMOLOGICA HUNGARICA ROVARTANI KÖZLEMÉNYEK XLIII. 1. 1982 p. 9-14 Morphology of Brachycaudus cardui L. (Homoptera, Aphididae) on some host plants in Hungary By E. T. E. DARWISH (Received December 1, 1981) Abstract: The apterous adult female and larval stages of Brachycaudus cardui L. were studied and described. Measurements of specimens collected on different host plants are compared. Dr. H. SZELEGIEWICZ (Warsaw) kindly took my attention to the lack of information in morphology of B. cardui L. and gave me the initial stimulus for what I express here my sincere gratitude. The present work was carried out in the Hungarian Natural History Museum, with the object of adding new contribution to our available knowledge on the aphid B. cardui L. infesting some plants in Hungary. Among the aphids collected in 1981 by the author from Budapest and its neighbourhood was B. cardui L. which is considered one of the most injurious pests on plum trees in Hungary. The morphology of apterous female and immature stages is described. During my study I found some characters which do not agree with data in the following papers: WALKER (1852) mentioned that the antennae are much shorter than the body and 7 jointed, front hardly convex and dull greenish red in colour. CLARKE (1903) reported that the antennae are not more than half the length of body. S Z ALA Y -M AR ZSÓ (1969) mentioned that the length of body was 2.80 and the length of cauda 0.14 mm. BURGER (1975) in his key described that the apterous viviparae normally are without rhinaria on antennái segment III. Material and methods Specimens were found in large numbers in Nagykovácsi (Julia-major) on Matricaria chamomilla on the 2nd June, 1981; in Pomáz on Carduus nutans on the 4th June, 1981; in Óbuda on Carduus nutans on the 16th June, 1981 and in Pilisvörösvár on Chrysanthemum maximum on the 24th July, 1981. The aphids were collected in the field with the plant which was then taken to the laboratory, where specimens were transferred into 70% ethyl alcohol. For maceration the method mentioned by VAN EMDEN (1972) was used. The specimens were mounted in BERLESE'

s fluid. Measurements of 10 individuals from each locality and each instar were taken, and the mean of the ten measurements are given with the standard error together in Table 1 and 2. DESCRIPTION OF DIFFERENT STAGES I. Apterous viviparous female In life yellowish green or dark green in colour. In mounted specimens body wide oval (fig. 1), about 2.00 to 2.604 mm in length. Compound eyes about 5 times longer than triommatidion,