. An introduction to zoology, with directions for practical work (invertebrates). 332 INTRODUCTION TO ZOOLOGY Family 2 : Syrphidae (the Hover-flies) Hover-flies are very plentiful in every garden, or Syrphus '^^^^'"^ ^^^ "^^7 ^^ s^^'i hovering over the flowers in the sunshine. With body motionless, and wings vibrating so rapidly as to be al- most indistinguish- able, they feed on the pollen of the flowers, and then dart rapidly away. They are rather large flies, often hairy, and of a brown colour usually barred with yellow, rather. Fio. 251.—A Syrphid Fly, enlarged to show Wing Veuat
. An introduction to zoology, with directions for practical work (invertebrates). 332 INTRODUCTION TO ZOOLOGY Family 2 : Syrphidae (the Hover-flies) Hover-flies are very plentiful in every garden, or Syrphus '^^^^'"^ ^^^ "^^7 ^^ s^^'i hovering over the flowers in the sunshine. With body motionless, and wings vibrating so rapidly as to be al- most indistinguish- able, they feed on the pollen of the flowers, and then dart rapidly away. They are rather large flies, often hairy, and of a brown colour usually barred with yellow, rather. Fio. 251.—A Syrphid Fly, enlarged to show Wing Veuatiou. (x3.) resembling bees or wasps at the first glance, though their thick bodies, with no sign of the remarkably slender " waist" of bees and wasps, very readily distinguish them when more carefully observed. Moreover, the veining of the wings is quite peculiar and characteristic, for at the free edge of the wing are two nervures which run parallel to the edge and are not crossed by any of the longitudinal nervures; just behind these there is a deep bay (Fig. 251). Many of these Hover-flies have larvae which live on plantsin the garden, feeding on the green- fly which they transfix on the three sharp points of their mouth- organs and hold aloft as they feed. They are soft white legless grubs tapering in front (Fig. 252). They constantly stretch and contract their bodies as they creep along after their prey. They pupate on the plants, the larval body contracting and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lulham, Rosalie Blanche Jermaine. London, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1913
