﻿CONTRIBUTION 
  TO 
  KNOWLEDGE 
  OF 
  TABANIDAE 
  OF 
  PALESTINE. 
  297 
  

  

  Head 
  light 
  neutral 
  grey 
  pollinose, 
  face 
  and 
  jowls 
  somewhat 
  thinly 
  clothed 
  with 
  

   whitish 
  hair, 
  longer 
  in 
  basi-occipital 
  region, 
  hind 
  margin 
  of 
  occiput 
  fringed 
  above 
  

   and 
  at 
  sides 
  with 
  very 
  short, 
  pale 
  yellowish 
  hair 
  ; 
  front 
  in 
  $ 
  of 
  medium 
  and 
  entirely 
  

   uniform 
  width, 
  about 
  three 
  and 
  a 
  half 
  times 
  as 
  long 
  as 
  broad, 
  clothed 
  with 
  minute, 
  

   appressed, 
  glistening 
  ochreous 
  or 
  pale 
  yellowish 
  hair, 
  ground-colour 
  slightly 
  darker 
  

   in 
  region 
  of 
  vertex 
  but 
  no 
  trace 
  of 
  an 
  ocellar 
  tubercle 
  ; 
  lower 
  and 
  upper 
  frontal 
  

   colli 
  fused 
  together 
  to 
  form 
  a 
  single, 
  elongate, 
  shining 
  black 
  callus, 
  extending 
  from 
  

   level 
  of 
  inner 
  angles 
  of 
  eyes 
  to 
  a 
  point 
  slightly 
  more 
  than 
  one-third 
  of 
  length 
  of 
  

   front 
  from 
  hind 
  margin 
  of 
  vertex; 
  callus 
  exhibiting 
  a 
  trace 
  of 
  a 
  fine, 
  elongate, 
  

   median 
  groove, 
  and 
  separated 
  from 
  eye 
  on 
  each 
  side 
  by 
  an 
  interspace 
  equal 
  to 
  rather 
  

   less 
  than 
  half 
  its 
  width, 
  lower 
  margin 
  of 
  callus 
  straight, 
  upper 
  extremity 
  ogival, 
  

   the 
  middle 
  region 
  somewhat 
  constricted, 
  so 
  that 
  outline 
  of 
  entire 
  callus 
  is 
  suggestive 
  

   of 
  that 
  of 
  an 
  Ancient 
  Greek, 
  leaf-shaped 
  sword 
  ; 
  eyes 
  of 
  $ 
  in 
  life 
  plain 
  dark 
  green, 
  

   unhanded 
  ; 
  proximal 
  segment 
  of 
  palpi 
  clothed 
  with 
  whitish 
  hair, 
  distal 
  segment 
  

   in 
  5 
  acuminate, 
  sparsely 
  clothed 
  on 
  outer 
  surface 
  with 
  minute, 
  appressed, 
  yellowish 
  

   hairs 
  ; 
  first 
  two 
  joints 
  of 
  antennae 
  clothed 
  above 
  and 
  below 
  with 
  short 
  black 
  hairs, 
  

   first 
  joint 
  not 
  swollen 
  and 
  not 
  embracing 
  second 
  joint, 
  upper 
  distal 
  angle 
  of 
  latter 
  

   moderately 
  produced, 
  annulate 
  portion 
  of 
  third 
  joint 
  about 
  one-fourth 
  shorter 
  

   than 
  expanded 
  portion, 
  depth 
  of 
  latter, 
  from 
  centre 
  of 
  lower 
  margin 
  to 
  apex 
  of 
  

   angle 
  on 
  upper 
  border, 
  about 
  equal 
  to 
  its 
  length, 
  angle, 
  which 
  bears 
  a 
  few 
  exceedingly 
  

   minute 
  black 
  hairs, 
  situate 
  in 
  centre 
  of 
  upper 
  border, 
  which 
  is 
  slightly 
  emarginate 
  

   in 
  front 
  of 
  it. 
  Thorax 
  : 
  dorsum 
  (including 
  scutellum) 
  and 
  pleurae 
  clothed 
  with 
  

   pale 
  ochreous 
  or 
  pale 
  yellowish 
  hair, 
  the 
  hairy 
  covering 
  of 
  the 
  pleurae 
  almost 
  

   whitish 
  at 
  the 
  tips, 
  lateral 
  borders 
  of 
  dorsum 
  and 
  commencement 
  of 
  two 
  

   longitudinal 
  stripes 
  extending 
  a 
  short 
  distance 
  from 
  front 
  margin 
  cinereous 
  

   pollinose. 
  Abdomen 
  : 
  first 
  and 
  second 
  (visible) 
  tergites 
  clothed 
  with 
  glistening 
  

   appressed, 
  pale 
  ochreous 
  hair, 
  the 
  hair 
  forming 
  a 
  tuft 
  in 
  the 
  centre 
  of 
  the 
  hind 
  

   border 
  of 
  the 
  first 
  tergite 
  paler, 
  and 
  that 
  on 
  the 
  hind 
  border 
  of 
  the 
  second 
  tergite 
  

   glistening 
  whitish 
  ; 
  glistening, 
  appressed, 
  pale 
  hair 
  on 
  hind 
  borders 
  of 
  fifth 
  and 
  

   sixth 
  segments 
  extending 
  forwards 
  in 
  middle 
  fine 
  in 
  each 
  case 
  in 
  form 
  of 
  a 
  broad 
  

   triangle, 
  apex 
  of 
  which 
  is 
  almost 
  or 
  quite 
  in 
  contact 
  with 
  hind 
  margin 
  of 
  preceding 
  

   segment 
  ; 
  sides 
  of 
  sixth 
  tergite 
  and 
  entire 
  surface 
  of 
  seventh 
  clothed 
  with 
  

   glistening, 
  appressed, 
  pale 
  ochreous 
  or 
  pale 
  yellowish 
  hair 
  ; 
  ground 
  colour 
  of 
  seventh 
  

   tergite 
  cinereous 
  pollinose 
  ; 
  venter 
  blackish 
  slate-coloured, 
  neutral 
  grey 
  pollinose 
  

   but 
  moderately 
  shining, 
  clothed 
  with 
  short, 
  glistening, 
  appressed, 
  pale 
  ochreous 
  or 
  

   pale 
  yellowish 
  hair, 
  extreme 
  hind 
  margins 
  of 
  second 
  and 
  following 
  scutes 
  cream- 
  

   buff. 
  Wings 
  : 
  proximal 
  portions 
  of 
  first 
  and 
  fifth 
  longitudinal 
  veins 
  ochraceous 
  

   tawny, 
  bases 
  of 
  second 
  and 
  sixth 
  veins 
  ochreous, 
  veins 
  otherwise 
  dark 
  mummy- 
  

   brown 
  or 
  dark 
  sepia-coloured, 
  anterior 
  branch 
  of 
  third 
  longitudinal 
  vein 
  without 
  

   an 
  appendix. 
  Squamae 
  fight 
  buff, 
  fringed 
  with 
  pale 
  hair. 
  Halteres 
  : 
  knobs 
  dark 
  

   seal-brown 
  above 
  and 
  below, 
  stalks 
  and 
  tips 
  of 
  knobs 
  cream-buff 
  or 
  cinnamon- 
  

   buff. 
  Legs 
  : 
  coxae 
  neutral 
  grey 
  pollinose, 
  both 
  they 
  and 
  femora 
  clothed 
  with 
  fine, 
  

   yellowish 
  hair 
  ; 
  tarsi 
  and 
  tips 
  of 
  tibiae, 
  as 
  also 
  inner 
  sides 
  of 
  front 
  pair 
  of 
  latter, 
  

   clothed 
  with 
  minute, 
  appressed, 
  black 
  hairs, 
  tibiae 
  elsewhere 
  clothed 
  with 
  short, 
  

   glistening, 
  appressed, 
  yellowish- 
  white, 
  pale 
  yellowish, 
  or 
  pale 
  ochreous 
  hair 
  ; 
  

   front 
  tibiae 
  slightly 
  thickened. 
  

  

  