﻿A 
  NEW 
  EAST 
  AFRICAN 
  TSETSE-FLY. 
  313 
  

  

  Thorax 
  much 
  as 
  in 
  G. 
  morsitans, 
  though 
  dark 
  markings 
  on 
  dorsum, 
  especially 
  

   in 
  $, 
  are 
  often 
  more 
  distinct 
  ; 
  apical 
  scutellar 
  bristles 
  in 
  $, 
  as 
  in 
  same 
  sex 
  of 
  

   G. 
  morsitans, 
  extremely 
  short, 
  reduced 
  to 
  mere 
  stumps. 
  

  

  Abdomen 
  (cf. 
  fig. 
  1, 
  b) 
  : 
  dark 
  blotches 
  on 
  second 
  tergite 
  in 
  both 
  sexes 
  more 
  trans- 
  

   versely 
  ovate 
  than 
  corresponding 
  blotches 
  in 
  case 
  of 
  G. 
  morsitans, 
  and 
  their 
  inner 
  

   extremities 
  as 
  a 
  rule 
  much 
  more 
  closely 
  approximate 
  ; 
  interrupted 
  transverse 
  bands 
  

   on 
  following 
  three 
  tergites 
  black, 
  blackish-brown 
  or 
  olivaceous-black, 
  clearly 
  defined 
  

   in 
  both 
  sexes, 
  occupying 
  approximately 
  the 
  anterior 
  three-fourths 
  of 
  the 
  segment 
  

   in 
  each 
  case, 
  and 
  having 
  the 
  posterior 
  margin 
  of 
  the 
  inner 
  half 
  of 
  each 
  half-band 
  

   parallel 
  to 
  that 
  of 
  its 
  tergite 
  ; 
  ground-colour 
  of 
  sixth 
  and 
  seventh 
  tergites 
  drab- 
  

   grey 
  in 
  both 
  sexes, 
  anterior 
  half 
  or 
  three-fifths 
  of 
  sixth 
  tergite 
  occupied 
  bj- 
  a 
  dark 
  

   transverse 
  band, 
  which 
  tapers 
  towards 
  each 
  basal 
  angle 
  but 
  does 
  not 
  reach 
  it, 
  while 
  

   in 
  the 
  middle 
  line 
  it 
  is 
  sometimes 
  only 
  indistinctly 
  interrupted, 
  although 
  strongly 
  

   emarginate 
  posteriorly 
  ; 
  hectors 
  of 
  <$ 
  agreeing 
  in 
  shape 
  with 
  those 
  of 
  G. 
  morsitans 
  

   but 
  much 
  darker 
  (neutral 
  grey, 
  deep 
  neutral 
  grey 
  or 
  dark 
  neutral 
  grey), 
  usually 
  

   contrasting 
  sharply 
  in 
  colour 
  with 
  base 
  of 
  median 
  triangle 
  separating 
  their 
  distal 
  

   extremities, 
  whereas 
  in 
  G. 
  morsitans 
  the 
  hectors 
  are 
  but 
  slightly 
  darker 
  than 
  corres- 
  

   ponding 
  triangle 
  ; 
  hypopygium 
  of 
  <$ 
  pinkish-cinnamon, 
  dusky 
  drab 
  or 
  deep 
  brownish- 
  

   drab, 
  similar 
  in 
  size 
  and 
  appearance 
  to 
  that 
  of 
  G. 
  morsitans, 
  though, 
  if 
  anything, 
  

   slightly 
  larger 
  ; 
  superior 
  claspers 
  of 
  $ 
  with 
  the 
  transverse 
  diameter 
  of 
  the 
  distal 
  

   portion 
  of 
  their 
  spatulate 
  expansions 
  distinctly 
  greater 
  than 
  in 
  G. 
  morsitans 
  (see 
  fig. 
  2), 
  

   and 
  with 
  their 
  median 
  lobes 
  (ml) 
  in 
  each 
  case 
  terminating 
  distally 
  in 
  a 
  sharp 
  point, 
  

   instead 
  of 
  having 
  their 
  apices 
  blunt 
  and 
  divergent 
  as 
  in 
  G. 
  morsitans 
  (cf. 
  figs. 
  2, 
  2a). 
  

  

  Wings, 
  squamae 
  and 
  halteres 
  as 
  in 
  G. 
  morsitans. 
  

  

  Legs 
  as 
  in 
  G. 
  morsitans, 
  except 
  that 
  the 
  local 
  infuscation 
  of 
  the 
  femora 
  is, 
  at 
  least 
  

   in 
  the 
  case 
  of 
  the 
  (J, 
  usually 
  more 
  pronounced. 
  

  

  Tanganyika 
  Territory 
  (Mwanza 
  District) 
  : 
  type 
  of 
  o 
  and 
  type 
  of 
  $, 
  Ididi 
  R. 
  

   six 
  miles 
  from 
  Kindabu, 
  15. 
  v. 
  1922 
  (P. 
  Tally) 
  ; 
  one^ 
  paratype, 
  Mwangwhela, 
  22. 
  v. 
  1922 
  

   (C. 
  F. 
  M. 
  Swynnerton) 
  ; 
  four^ 
  paratypes, 
  road 
  west 
  of 
  Zagayu, 
  26. 
  v. 
  1922 
  (P. 
  Tully) 
  ; 
  

   three 
  $ 
  paratypes, 
  Ngali, 
  17.V.1922 
  (C. 
  F. 
  M. 
  Swynnerton) 
  ; 
  one 
  $ 
  paratype, 
  between 
  

   Tomao 
  and 
  Zagayu, 
  16-18.V.1922 
  (P. 
  Tully) 
  ; 
  one 
  $ 
  paratype, 
  Lukungu, 
  15. 
  vi. 
  1922 
  

   (C. 
  F. 
  M. 
  Swynnerton). 
  

  

  In 
  addition 
  to 
  the 
  specimens 
  selected 
  as 
  types 
  and 
  paratypes, 
  and 
  referred 
  to 
  in 
  

   the 
  foregoing 
  paragraph, 
  Mr. 
  Swynnerton 
  has 
  brought 
  to 
  England 
  several 
  thousand 
  

   males 
  and 
  females 
  of 
  the 
  new 
  species, 
  collected 
  during 
  May 
  and 
  June 
  of 
  the 
  present 
  

   year 
  in 
  more 
  than 
  twenty 
  different 
  localities 
  in 
  the 
  Mwanza 
  District. 
  A 
  represen- 
  

   tative 
  series 
  of 
  examples, 
  selected 
  from 
  this 
  material, 
  has 
  been 
  examined 
  by 
  the 
  

   writer, 
  and 
  in 
  a 
  number 
  of 
  instances, 
  with 
  the 
  kind 
  assistance 
  of 
  Mr. 
  Swynnerton, 
  

   the 
  male 
  genitalia 
  have 
  been 
  mounted 
  and 
  studied 
  under 
  the 
  microscope. 
  In 
  no 
  

   case 
  has 
  there 
  been 
  detected 
  any 
  noteworthy 
  variation 
  from 
  the 
  typical 
  form 
  as 
  

   described 
  above, 
  and 
  in 
  not 
  a 
  single 
  instance 
  was 
  there 
  any 
  doubt 
  that 
  the 
  specimen 
  

   under 
  examination 
  was 
  specifically 
  distinct 
  from 
  Glossina 
  morsitans, 
  Westw. 
  The 
  

   diagnostic 
  characters 
  of 
  the 
  new 
  species 
  (printed 
  in 
  italics 
  at 
  the 
  commencement 
  of 
  

   the 
  above 
  description) 
  seem 
  indeed 
  to 
  be 
  remarkably 
  stable. 
  On 
  the 
  other 
  hand, 
  

   as 
  is 
  well 
  known, 
  G. 
  morsitans 
  often 
  exhibits 
  considerable 
  variation 
  as 
  regards 
  the 
  

   completeness 
  or 
  otherwise 
  of 
  its 
  abdominal 
  markings, 
  and 
  'certain 
  individuals, 
  par- 
  

   ticularly 
  those 
  belonging 
  to 
  the 
  form 
  submorsitans, 
  Newst., 
  sometimes 
  present 
  what 
  

   may 
  at 
  first 
  sight 
  appear 
  to 
  be 
  a 
  deceptive 
  similarity 
  to 
  G. 
  swynnertoni 
  in 
  the 
  shape, 
  

   depth 
  and 
  completeness 
  of 
  their 
  abdominal 
  bands. 
  In 
  such 
  cases, 
  however, 
  apart 
  

   from 
  the 
  difference 
  in 
  the 
  ground-colour 
  of 
  the 
  abdomen 
  that 
  is 
  usually 
  noticeable, 
  

   closer 
  scrutiny 
  will 
  show 
  that 
  the 
  hind 
  margins 
  of 
  the 
  inner 
  halves 
  of 
  the 
  dark 
  half- 
  

   bands 
  are 
  not 
  so 
  uniformly 
  parallel 
  to 
  those 
  of 
  the 
  respective 
  segments 
  as 
  in 
  the 
  

   species 
  just 
  described. 
  Finally, 
  any 
  doubt 
  that 
  may 
  still 
  linger 
  can 
  be 
  allayed 
  by 
  

   means 
  of 
  an 
  examination 
  of 
  the 
  male 
  genitalia. 
  

  

  