﻿CONTRIBUTION 
  TO 
  KNOWLEDGE 
  OF 
  TABANIDAE 
  OF 
  PALESTINE. 
  313 
  

  

  in 
  $ 
  broad, 
  slightly 
  narrower 
  below, 
  its 
  length 
  equal 
  to 
  rather 
  less 
  than 
  four 
  times 
  

   its 
  breadth 
  at 
  lower 
  margin 
  of 
  lower 
  callus, 
  clothed 
  above 
  with 
  minute 
  black 
  hairs 
  

   and 
  below 
  with 
  appressed 
  yellowish 
  hairs, 
  vertex 
  darker 
  (dark 
  olive-grey), 
  but 
  

   without 
  trace 
  of 
  ocellar 
  tubercle 
  ; 
  two 
  frontal 
  colli 
  in 
  $, 
  lower 
  frontal 
  callus 
  shining 
  

   black 
  or 
  blackish-brown, 
  large, 
  broad, 
  quadrate, 
  about 
  four-fifths 
  as 
  high 
  as 
  broad, 
  

   only 
  separated 
  from 
  eye 
  on 
  each 
  side 
  by 
  an 
  exceedingly 
  narrow, 
  pollinose 
  interval 
  ; 
  

   upper 
  frontal 
  callus 
  in 
  $ 
  represented 
  by 
  a 
  large 
  black 
  mark, 
  rather 
  less 
  than 
  half- 
  

   way 
  between 
  upper 
  margin 
  of 
  lower 
  callus 
  and 
  vertex, 
  separated 
  from 
  eye 
  on 
  each 
  

   side, 
  bare 
  of 
  pollen 
  but 
  in 
  undamaged 
  specimens 
  clothed 
  with 
  minute, 
  appressed, 
  

   yellowish 
  hairs, 
  and 
  usually 
  either 
  roughly 
  V-shaped, 
  or 
  transversely 
  oval 
  or 
  

   elliptical, 
  with 
  a 
  deep, 
  narrow 
  indentation 
  in 
  middle 
  line 
  above 
  ; 
  eyes 
  in 
  <J 
  

   with 
  sharply 
  defined 
  hind 
  and 
  upper 
  border 
  of 
  small 
  facets, 
  not 
  tapering 
  off 
  but 
  

   extending 
  in 
  full 
  depth 
  to 
  vertex, 
  while 
  greatest 
  depth 
  of 
  lower 
  border, 
  which 
  also 
  

   consists 
  of 
  minute 
  facets, 
  is 
  about 
  2| 
  times 
  that 
  of 
  upper 
  border; 
  eyes 
  of 
  <} 
  in 
  

   life 
  with 
  area 
  of 
  large 
  facets 
  greyish 
  brown 
  or 
  a 
  beautiful 
  steely 
  grey, 
  lower 
  

   border 
  consisting 
  of 
  small 
  facets 
  purplish 
  bronze 
  or 
  reddish 
  brown, 
  a 
  dark 
  

   horizontal 
  band, 
  coloured 
  like 
  the 
  band 
  in 
  $, 
  close 
  to 
  upper 
  margin 
  of 
  lower 
  border, 
  

   hind 
  and 
  upper 
  border 
  dark 
  purplish 
  brown 
  ; 
  eyes 
  of 
  $ 
  in 
  life 
  bronze-green 
  with 
  

   a 
  purplish 
  sheen, 
  or 
  purplish 
  bronze, 
  with 
  a 
  single, 
  horizontal, 
  dark 
  purple, 
  dark 
  

   purplish 
  brown, 
  or 
  dark 
  brown 
  band, 
  starting 
  from 
  inner 
  margin 
  of 
  each 
  eye 
  

   adj 
  acent 
  to 
  lower 
  frontal 
  callus, 
  extending 
  outwards 
  and 
  backwards, 
  and 
  ending 
  bluntly 
  

   at 
  about 
  one-fifth 
  of 
  the 
  diameter 
  from 
  hind 
  margin 
  ; 
  palpi 
  light 
  buff, 
  or 
  ivory 
  

   white 
  (proximal 
  segment 
  mouse 
  grey 
  at 
  base), 
  clothed 
  with 
  whitish 
  hair, 
  in 
  case 
  

   of 
  (J 
  usually 
  mingled 
  towards 
  distal 
  extremity 
  of 
  greatly 
  swollen, 
  pyriform 
  or 
  ovate 
  

   pyriform, 
  terminal 
  segment 
  with 
  a 
  few 
  minute 
  black 
  hairs 
  ; 
  terminal 
  segment 
  

   of 
  $ 
  palpi 
  acuminate 
  (proximal 
  half 
  greatly 
  swollen), 
  its 
  outer 
  surface 
  clothed 
  with 
  

   minute, 
  appressed, 
  glistening 
  white 
  or 
  yellowish 
  white 
  hairs, 
  frequently 
  mixed 
  

   with 
  minute, 
  scattered, 
  appresseoT, 
  black 
  hairs 
  ; 
  first 
  and 
  second 
  joints 
  of 
  antennae 
  

   blackish 
  (first 
  joint 
  somewhat 
  greyish 
  pollinose 
  above), 
  clothed 
  below 
  with 
  

   glistening 
  whitish 
  hair 
  and 
  above 
  with 
  minute 
  black 
  hairs, 
  first 
  joint 
  greatly 
  swollen, 
  

   its 
  bluntly 
  produced 
  upper 
  distal 
  angle 
  overlapping 
  the 
  sharp 
  corresponding 
  angle 
  

   of 
  the 
  small 
  second 
  joint, 
  third 
  joint 
  warm 
  sepia-coloured 
  to 
  fuscous-black, 
  its 
  

   expanded 
  portion 
  moderately 
  broad, 
  with 
  a 
  blunt 
  but 
  fairly 
  prominent 
  angle 
  close 
  

   to 
  base 
  of 
  upper 
  margin. 
  Thorax 
  : 
  dorsum 
  with 
  usual 
  light 
  grey 
  longitudinal 
  

   stripes 
  more 
  or 
  less 
  distinctly 
  marked, 
  erect 
  hair 
  partly 
  blackish, 
  partly 
  pale 
  (fight 
  

   buff), 
  except 
  on 
  anterior 
  margin, 
  where 
  it 
  is 
  entirely 
  whitish 
  ; 
  swelling 
  in 
  depression 
  

   at 
  each 
  end 
  of 
  transverse 
  suture 
  greyish 
  pollinose 
  vinaceous-fawn, 
  clothed 
  mainly 
  

   with 
  black 
  hair 
  ; 
  humeral 
  and 
  postalar 
  calli, 
  and 
  lateral 
  border 
  of 
  dorsum 
  above 
  

   base 
  of 
  wing 
  on 
  each 
  side, 
  clothed 
  with 
  whitish 
  hair 
  ; 
  pleurae 
  and 
  pectus 
  pallid 
  

   neutral 
  grey 
  pollinose, 
  clothed 
  with 
  fairly 
  long, 
  fine 
  hair 
  of 
  same 
  tint. 
  Abdomen 
  : 
  

   lateral 
  margins 
  of 
  tergites, 
  from 
  second 
  or 
  third 
  (visible) 
  to 
  distal 
  extremity, 
  and 
  

   posterior 
  borders 
  of 
  dorsal 
  and 
  ventral 
  scutes 
  of 
  all 
  segments 
  cream-buff 
  ; 
  basal 
  

   angles 
  of 
  first 
  (visible) 
  tergite 
  more 
  or 
  less 
  greyish 
  pollinose 
  ; 
  pallid 
  neutral 
  grey 
  

   markings 
  of 
  dorsum, 
  described 
  in 
  diagnosis 
  above, 
  clothed 
  with 
  minute, 
  appressed, 
  

   cream-coloured 
  hairs, 
  and 
  usually 
  most 
  distinct 
  (sharply 
  defined 
  in 
  5) 
  on 
  second 
  and 
  

   three 
  following 
  segments, 
  but 
  sometimes 
  distinguishable 
  on 
  first 
  and 
  sixth 
  segments 
  

  

  