. Entomology for medical officers. Insect pests; Insects as carriers of disease. 140 ENTOMOLOGY FOR MEDICAL OFFICERS Family AsiLlD^: Robber-flies (Fig. 45), Lat. Asilus = a. horse-fly). Usually bristly, elongate flies—but sometimes thickly hairy and bee-like—with remarkably long, strong, bristly legs. The head is broad and short, joined to the thorax by a very distinct and mobile neck, and deeply notched on the crown between the eyes. Antennae composed of 3 simple segments, with or without a terminal bristle or style. Proboscis strong, chitinous, and pointed; formed for stabbing. Abdomen of 8
. Entomology for medical officers. Insect pests; Insects as carriers of disease. 140 ENTOMOLOGY FOR MEDICAL OFFICERS Family AsiLlD^: Robber-flies (Fig. 45), Lat. Asilus = a. horse-fly). Usually bristly, elongate flies—but sometimes thickly hairy and bee-like—with remarkably long, strong, bristly legs. The head is broad and short, joined to the thorax by a very distinct and mobile neck, and deeply notched on the crown between the eyes. Antennae composed of 3 simple segments, with or without a terminal bristle or style. Proboscis strong, chitinous, and pointed; formed for stabbing. Abdomen of 8 segments, with the genitalia con- spicuous. Empodium bristle-like, or absent; pulvilli usually. Fig. 45.—Eobber-fly. distinct, claws strong. Wing-venation complex, with two or three submarginal and five posterior cells. Squamse small. The Robber-flies are one of the largest families of Diptera, and are found in all parts of the world. Some of them are very large. They live entirely upon other insects, swooping upon them and impaling them with their proboscis, and then flying off with them clasped in their legs, to suck them at leisure. A robber-fly will often thus treat an insect much larger than itself Robber-flies have been said to suck blood occasionally, and several medical officers from Africa have stated that they have been thus attacked, but this behaviour is not usual. Family Therevid^ (Q)^pevew = to hunt). The flies of this. 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 Alcock, A. (Alfred), 1859-1933. London, Gurney & Jackson
Size: 1690px × 1478px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpubl, booksubjectinsectpests
