﻿311 
  

  

  A 
  NEW 
  EAST 
  AFRICAN 
  TSETSE-FLY 
  (GENUS 
  GLOSSINA, 
  WEED.), 
  WHICH 
  

   APPARENTLY 
  DISSEMINATES 
  SLEEPING 
  SICKNESS. 
  

  

  By 
  Major 
  E. 
  E. 
  Austen, 
  D.S.O. 
  

  

  Although 
  within 
  the 
  last 
  few 
  years 
  — 
  -chiefly 
  owing 
  to 
  the 
  diagnostic 
  ability 
  and 
  

   brilliant 
  technical 
  skill 
  of 
  Professor 
  Robert 
  Newstead, 
  F.R.S. 
  — 
  several 
  additions 
  

   have 
  been 
  made 
  to 
  the 
  list 
  of 
  recognised 
  species 
  of 
  Glossina, 
  the 
  numerical 
  total 
  

   of 
  which 
  now 
  stands 
  at 
  nineteen, 
  the 
  Glossina 
  morsitans 
  Group 
  has 
  not 
  received 
  a 
  

   single 
  accession. 
  Peculiar 
  interest 
  therefore 
  attaches 
  to 
  the 
  discovery 
  of 
  the 
  species 
  

   described 
  below, 
  not 
  only 
  by 
  reason 
  of 
  its 
  apparent 
  pathogenic 
  importance,* 
  but 
  

   also 
  on 
  account 
  of 
  its 
  systematic 
  position 
  within 
  the 
  genus. 
  The 
  new 
  species 
  in 
  

   question, 
  of 
  which, 
  through 
  the 
  courtesy 
  of 
  the 
  Imperial 
  Bureau 
  of 
  Entomology, 
  

   the 
  types 
  and 
  paratypes, 
  in 
  addition 
  to 
  a 
  series 
  of 
  other 
  examples, 
  are 
  in 
  the 
  British 
  

   Museum 
  (Natural 
  History), 
  rnay 
  be 
  characterised 
  as 
  follows 
  : 
  — 
  

  

  Glossina 
  swynnertoni, 
  sp. 
  n. 
  (figs. 
  1, 
  2, 
  3). 
  

  

  cJ$. 
  — 
  Length, 
  $ 
  (six 
  specimens) 
  7-6 
  to 
  8-6 
  mm., 
  $ 
  (six 
  specimens) 
  8-6 
  to 
  9-5 
  mm. 
  , 
  

   width 
  of 
  head, 
  $ 
  2-5 
  to 
  just 
  over 
  2-5 
  mm., 
  $ 
  2-5 
  to 
  2-6 
  mm. 
  ; 
  width 
  of 
  front 
  at 
  

   vertex, 
  ^ 
  0-6 
  mm., 
  $ 
  just 
  under 
  1 
  mm. 
  ; 
  length 
  of 
  wing, 
  $ 
  7-8 
  to 
  8 
  mm., 
  $ 
  8-6 
  to 
  

   9 
  mm. 
  

  

  Fie 
  

  

  TER2J 
  I 
  

  

  1. 
  Abdomens 
  of 
  (a) 
  Glossina 
  morsitans, 
  Westw., 
  $, 
  and 
  (b) 
  G. 
  swynnertoni, 
  Austen, 
  q. 
  

   dorsal 
  view, 
  x 
  12 
  ; 
  first 
  (basal) 
  tergite 
  not 
  shown 
  in 
  either 
  case. 
  

  

  A 
  member 
  of 
  the 
  Glossina 
  morsitans 
  Group 
  and 
  closely 
  allied 
  to 
  G. 
  morsitans, 
  Westw., 
  

   from 
  normal 
  specimens 
  of 
  which 
  it 
  is 
  at 
  once 
  distinguishable 
  in 
  the 
  case 
  of 
  both 
  sexes 
  

   by 
  its 
  much 
  darker 
  coloration 
  ; 
  by 
  the 
  ground-colour 
  of 
  the 
  dorsum 
  of 
  the 
  abdomen 
  being 
  

   drab,] 
  light 
  drab 
  or 
  drab-grey 
  {occasionally 
  , 
  especially 
  in 
  centre 
  of 
  second 
  tergite, 
  cinnamon- 
  

   buff 
  or 
  greyish-cinnamon-buff) 
  instead 
  of 
  buff-yellow 
  or 
  ochraceous-buff 
  ; 
  by 
  the 
  paler 
  

   area 
  in 
  the 
  centre 
  of 
  the 
  second 
  abdominal 
  tergite 
  being 
  much 
  less 
  conspicuous 
  and 
  much 
  

  

  * 
  Cf. 
  Mr. 
  C. 
  F. 
  M. 
  Swynnerton's 
  statements, 
  infra, 
  p. 
  337. 
  

  

  t 
  For 
  names 
  and 
  illustrations 
  of 
  colours 
  mentioned 
  in 
  the 
  present 
  paper 
  see 
  Ridgway, 
  " 
  Color 
  

   Standards 
  and 
  Color 
  Nomenclature." 
  (Washington, 
  D.C. 
  Published 
  by 
  the 
  Author, 
  1912.) 
  

  

  