834 



THE DIPTERA 



Picard, S. limbata Austen, S. nigra Macquart, S. bengalensis Picard, 5. oblongo- 

 punctata Brunetti, 5. prattii Summers, 5. pulla Austen, 5. siliens Rondani, 

 5. triangularis Brunetti. 



African Species. — Fourteen species and four probable synonyms are known : 

 5. calcitrans L. (S. korogwensis Griinberg), 5. sitiens Rondani, S. griseiceps 

 Becker, 5. nigra Macquart (S. glauca Griinberg and S. lafonti Picard), S. bou- 

 vieri var. clara Roubaud, S. inornata Griinberg, S. omega Newstead, 5. varipes 

 Bezzi, 5. intermedia Roubaud, S. bouffardi Picard, 5. bilineata Griinberg, 5. 

 brunnipes Griinberg (S. stellata Griinberg), S. toniatus Bigot, S. ochrosoma 

 Speiser. 



American Species. — 5. calcitrans L. 

 Australian Species. — S. calcitrans L. 



For the methods of diagnosis of these species, vide Summers, L. M. {1912), 

 Journal of London School of Tropical Medicine, July, p. 184; London. 



The following table, modified from Griinberg, gives the diagnosis of a few 

 of the species: — 



A. Legs entirely yellow. Wings yellowish — S. tcsniatus Bigot, 1887. 



B. Legs either entirely black or largely black or blackish-brown. Wings 



clear or darkish coloured. 

 I. Venter brilliantly white — 5. sitiens Rondani, 1873. 

 II. Venter pale dusky brown, with characteristic omega mark on the 

 thorax — S. omega Newstead, 1907. 

 III. Venter grey or yellow. 



1. Thorax without clear black stripes. Hinder part black Avithout 



any markings — S. inornata Griinberg, 1906. 



2. Thorax with clear black stripes. Abdomen with regular dark 



marks or spots . 



(a) Knee, tibia, and tarsus — at all events, on the two anterior 

 pairs of legs — entirely brown. 



(1) Tibia and tarsus on the anterior and middle legs light 



brown, on the hind legs dark brown. Thorax with 

 two small brown longitudinal median lines — S. 

 bilineata Griinberg, 1906. 



(2) Tibia and tarsus brown on all three legs. Thorax with 



broad black longitudinal stripes. 



Wings blackish, head and thorax brown-yellow — 

 5. brunnipes Griinberg, 1906. 



Wings glassy, head and thorax grey — 5. stellata 

 Griinberg, 1906. 



(6) Legs black, with light brown knees or decidedly dark brown 

 spots. 



(1) Wing brushes yellowish-brown, with black tips. Abdo- 



men with dark middle longitudinal line. Second 

 and third segments with dark anterior and posterior 

 borders — 5. glauca Griinberg, 1906. 



(2) Wing brushes black. Abdomen grey. Both middle 



segments with regularly arranged dark spots without 

 dark median longitudinal line. 



Second and third abdominal segments with one 

 middle basal, one side apical dark spot, and dark 

 anterior border, with which the basal spot unites — 

 5. korogwensis Griinberg, 1906. 



Second and third abdominal segments with the 

 same dark spots, but without anterior border-lines — 

 5. calcitrans Linnaeus, 1761. 



Stomoxys calcitrans Linnaeus, 1758. 



5. calcitrans is the common stable- fly, found in houses, stables, 

 and in the open near cattle. It bites all classes of mammals, and 



