. A text-book of agricultural zoology. Zoology, Agricultural; Zoology, Economic. DU'TEKA OR TRUE FLIES. 207 the head end, about half an inch long, and dirty greyish-yellow in colour. They need no further comment, except that they may. Fic. 100.—Winter (TricJioceru). 1, 2, Lar\a of T. hiemcdis; 3, 4, pupa ; 5, 0, iinafjines ; 7, iiat. size. () be looked upon as useful insects, heli)ing the speedy decay of roots, &o., ill the soil. Amongst the Brachyoera are some of great importance : only one group can be mentioned here, namelj", the Gad-flies or Tabanidse. Gad-flies are
. A text-book of agricultural zoology. Zoology, Agricultural; Zoology, Economic. DU'TEKA OR TRUE FLIES. 207 the head end, about half an inch long, and dirty greyish-yellow in colour. They need no further comment, except that they may. Fic. 100.—Winter (TricJioceru). 1, 2, Lar\a of T. hiemcdis; 3, 4, pupa ; 5, 0, iinafjines ; 7, iiat. size. () be looked upon as useful insects, heli)ing the speedy decay of roots, &o., ill the soil. Amongst the Brachyoera are some of great importance : only one group can be mentioned here, namelj", the Gad-flies or Tabanidse. Gad-flies are large flies with a flattened body and large broad head closely united to the thorax (fig. 102, c). The}- are all provided with a sharp piercing mouth (fig. 101, b), with which they suck the blood of horses and cattle. The females are especially bloodthirsty; the males feed ofl' flowers. The larvas (fig. 102, u) liv(! in the ground, and arc vegetarian in habits. They are known under the names of Horse-flies, ISreeze- flies, and Brimps. There are several species very common in Britain, notably Haimatopoda plumalis, Tahanus hovinus, and T, autumnalis. The first named is about half an inch long, whitish-grey, covered with pale dull hairs in the female, dark grey in the male, wings mottled grey. The latter two. 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
