Entomology for medical officers / by A. Alcock.

  • Alfred William Alcock
Date:
1920
Catalogue details

Licence: In copyright

Credit: Entomology for medical officers / by A. Alcock. Source: Wellcome Collection.

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    is Anthomyid-like (Fig. 84), and the legs and abdomen somewhat elongate. The species of the common genus Scatophaga are of a greenish or yellowish-brown colour and are often hairy or bristly ; the labella are raspy as in Philamatomyia (Fig. 75) and Lispa (Fig. 86) and the male genitalia are reminiscent of some of the large tsetse-flies. (b) Calyptrate Muscoidea. The squamae are large and generally conceal the halteres in a dorsal view; the subcostal vein is distinct, and the 1st longitudinal vein is of good length ; the scutum is completely bisected by a transverse suture in front of the wings; generally (Auchmeromyia and Glossina are among the notable exceptions) the eyes are very much closer-set in the male than in the female. This division includes an enormous number of species, many of which are of import¬ ance to the sanitarian and pathologist; they are often grouped in six “ families,” which, however, are not always quite clearly defined one from another and are not universally recognised. The following table is taken from Williston’s North A merican Dipt era :— 1. 2. 4- 5- Synopsis of Families ^Calyptrate Muscoids. / Mouth and mouth-parts small or vestigial (Estridce. I Mouth and mouth-parts well formed = 2. Hypopleura with a tuft of bristles ; 1st posterior cell narrowed or closed = 3. Hypopleura with no tuft of bristles ; 1st posterior cell narrowed or fully open = 6. r Arista usually bare, sometimes pubescent ; body and legs very bristly Tachinidoe. Arista feathered or distinctly pubescent = 4. Arista feathered, but not to the tip ; discal bristles rarely present on the anterior segments of the abdomen Sarcophagidce. .Arista feathered or pubescent to the tip = 5. Abdomen usually with discal bristles on its anterior segments ; legs usually long Dexiidoe. .Abdomen with no discal bristles ; arista feathered Muscidce. First posterior cell narrowed or closed ; arista feathered to tip Muscidce. First posterior cell slightly or not at all narrowed ; arista feathered, pubescent, or bare A?ithomyidce. The Muscidae, which are by far the most important of these families, will be considered in the two following chapters.
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