. A text-book of agricultural zoology. Zoology, Economic. 210 DIPTERA OR TRUE FLIES. with paraffin-oil and soap, rubbed with a sponge. Miss Ormerod mentions soluble phrenyl as useful in one of her reports. The rest of the flies belong to the section Cyclorrhapha, which is divided again into the Proboscidea and Sprobosctdea. The Proboscidea contain the majority of flies, the following being the most important economic forms :— Hover-flies, or Syrphidae. The Syrphidfe are all moderate-sized flies, often brilliantly coloured, generally with banded bodies, yellow and black or brown being the predo
. A text-book of agricultural zoology. Zoology, Economic. 210 DIPTERA OR TRUE FLIES. with paraffin-oil and soap, rubbed with a sponge. Miss Ormerod mentions soluble phrenyl as useful in one of her reports. The rest of the flies belong to the section Cyclorrhapha, which is divided again into the Proboscidea and Sprobosctdea. The Proboscidea contain the majority of flies, the following being the most important economic forms :— Hover-flies, or Syrphidae. The Syrphidfe are all moderate-sized flies, often brilliantly coloured, generally with banded bodies, yellow and black or brown being the predominating colours. They hover in the air like a hawk, suddenly darting off and again remaining quivering. Fig. 103. —Hover-flies (Syrphidce). 1, Sifrplius halteatus; 2, larva devouring aphis; 3, pupa; 4, GataboTiibapyrastri; 5, larva ; 6, pupa; 7. Syrphus ribesii. (Curbis.) at a fresh spot. We only see them in the bright sun, and may notice them flying and hovering over plants, upon the nectar of which the adults feed. At other times we see them busy over colonies of Aphides, for here they deposit their eggs, their curious, almost repulsive-looking larvae (fig. 103, 2 and 5) feeding upon plant-lice, which they devour with great rapidity. The larvae are yellow, green, or red in colour, with a narrow anterior. 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 Theobald, Frederick Vincent, 1868-1930. Edinburgh and London, W. Blackwood and sons
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1899
