﻿276 
  F. 
  W. 
  EDWARDS. 
  

  

  middle 
  line. 
  Palpi 
  blackish 
  brown, 
  with 
  creamy 
  tips. 
  Proboscis 
  dark 
  brown 
  at 
  

   the 
  base 
  and 
  apex, 
  ochreous 
  in 
  the 
  middle 
  two-thirds 
  beneath 
  and 
  at 
  the 
  sides. 
  

   First 
  two 
  joints 
  of 
  antennae 
  with 
  small 
  flat 
  ochreous 
  scales, 
  the 
  basal 
  joint 
  ochreous. 
  

   Thorax 
  dark 
  brown, 
  clothed 
  with 
  narrow 
  brown 
  and 
  ochreous-brown 
  scales 
  without 
  

   any 
  definite 
  pattern. 
  Scutellar 
  scales 
  narrow. 
  Flat 
  ochreous 
  scales 
  on 
  the 
  pleurae. 
  

   Abdomen 
  dark 
  brown, 
  each 
  segment 
  with 
  whitish 
  basal 
  lateral 
  spots 
  and 
  median 
  

   bands 
  not 
  connected 
  with 
  the 
  spots. 
  Venter 
  whitish 
  ochreous, 
  the 
  apical 
  margins 
  

   of 
  the 
  apical 
  segments 
  black. 
  Legs 
  : 
  femora 
  without 
  any 
  intersprinkling 
  of 
  light 
  

   and 
  dark 
  scales, 
  pale 
  knee- 
  spots 
  very 
  distinct. 
  Tibiae 
  blackish, 
  on 
  the 
  front 
  and 
  

   middle 
  legs 
  largely 
  pale 
  on 
  their 
  outer 
  and 
  posterior 
  faces 
  ; 
  hind 
  tibiae 
  with 
  a 
  well- 
  

   marked 
  pale 
  spot 
  at 
  the 
  apex 
  on 
  the 
  outside, 
  which 
  is 
  about 
  equal 
  in 
  length 
  to 
  the 
  

   breadth 
  of 
  the 
  tibia. 
  Tarsi 
  blackish 
  ; 
  on 
  all 
  the 
  legs 
  there 
  is 
  a 
  narrow 
  ochreous 
  

   ring 
  embracing 
  the 
  tip 
  of 
  the 
  first 
  and 
  the 
  base 
  of 
  the 
  second 
  joint, 
  and 
  a 
  still 
  

   narrower 
  ring 
  embracing 
  the 
  tip 
  of 
  the 
  second 
  and 
  the 
  base 
  of 
  the 
  third. 
  All 
  the 
  

   claws 
  toothed. 
  Wings 
  clothed 
  with 
  dark 
  brown 
  scales, 
  those 
  of 
  the 
  lateral 
  series 
  

   linear. 
  Bases 
  of 
  fork-cells 
  level. 
  

  

  Length 
  about 
  5 
  mm. 
  

  

  Natal 
  : 
  Umbilo, 
  Durban 
  ; 
  1 
  $, 
  16. 
  v. 
  1914 
  (type) 
  ; 
  2 
  ?, 
  13. 
  ix. 
  14 
  and 
  1 
  $, 
  

   25. 
  ix. 
  1914 
  (L. 
  Bevis). 
  

  

  Readily 
  distinguished 
  from 
  all 
  other 
  African 
  species 
  by 
  the 
  tarsal 
  markings. 
  

   Although 
  small 
  pale 
  rings 
  are 
  present 
  on 
  these, 
  the 
  species 
  seems 
  to 
  belong 
  to 
  

   the 
  dentatus- 
  group. 
  

  

  0. 
  albocephalus, 
  Theo. 
  

  

  A 
  good 
  series 
  of 
  specimens 
  of 
  both 
  sexes 
  of 
  this 
  species 
  have 
  been 
  received 
  from 
  

   Durban 
  (E. 
  C. 
  Chubb 
  and 
  L. 
  Bevis). 
  Previously 
  it 
  was 
  only 
  known 
  in 
  the 
  male 
  sex 
  

   from 
  West 
  Africa. 
  It 
  proves 
  to 
  be 
  of 
  considerable 
  interest 
  owing 
  to 
  a 
  marked 
  

   difference 
  of 
  scale 
  characters 
  between 
  the 
  two 
  sexes. 
  In 
  the 
  male, 
  the 
  flat 
  scales 
  

   of 
  the 
  head 
  extend 
  up 
  to 
  the 
  middle 
  line 
  in 
  front, 
  while 
  in 
  the 
  female 
  the 
  middle 
  

   area 
  of 
  the 
  head 
  is 
  clothed 
  with 
  narrow 
  scales 
  ; 
  the 
  scutellar 
  scales 
  in 
  the 
  male 
  are 
  

   broad, 
  in 
  the 
  female 
  narrow. 
  No 
  such 
  sexual 
  difference 
  has 
  been 
  noticed 
  in 
  any 
  

   other 
  mosquito. 
  

  

  As 
  I 
  have 
  previously 
  pointed 
  out 
  (Bull. 
  Ent. 
  Res. 
  iii, 
  p. 
  21), 
  the 
  figure 
  which 
  

   Theobald 
  gives 
  (Mon. 
  Cul. 
  v, 
  p. 
  206) 
  as 
  representing 
  the 
  male 
  genitalia 
  of 
  0. 
  puncto- 
  

   thoracis, 
  really 
  depicts 
  those 
  of 
  0. 
  albocephalus. 
  This 
  figure, 
  however, 
  is 
  by 
  no 
  

   means 
  accurate, 
  and 
  a 
  fresh 
  one 
  is 
  therefore 
  given 
  herewith 
  (fig. 
  1, 
  c). 
  

  

  The 
  female 
  0. 
  albocephalus 
  can 
  be 
  distinguished 
  from 
  0. 
  quasiunivittatus, 
  which 
  

   it 
  otherwise 
  closely 
  resembles, 
  by 
  the 
  much 
  larger 
  white 
  spot 
  at 
  the 
  apex 
  of 
  the 
  

   hind 
  tibiae, 
  which 
  is 
  quite 
  twice 
  as 
  long 
  as 
  the 
  width 
  of 
  the 
  tibia. 
  

  

  0. 
  quasiunivittatus, 
  Theo. 
  

  

  This 
  species 
  occurs 
  side 
  by 
  side 
  with 
  0. 
  albocephalus 
  in 
  Durban, 
  a 
  few 
  females 
  

   having 
  been 
  sent 
  in 
  by 
  Mr. 
  Chubb. 
  What 
  appears 
  to 
  be 
  a 
  good 
  specific 
  character, 
  

   is 
  the 
  size 
  of 
  the 
  pale 
  spot 
  on 
  the 
  hind 
  tibia 
  ; 
  this 
  is 
  very 
  distinct, 
  and 
  is 
  about 
  equal 
  

   in 
  length 
  to 
  the 
  diameter 
  of 
  the 
  apex 
  of 
  the 
  tibia, 
  i.e. 
  it 
  is 
  about 
  as 
  broad 
  as 
  long. 
  

   The 
  thoracic 
  scaling 
  is 
  like 
  that 
  of 
  the 
  female 
  0. 
  albocephalus. 
  The 
  fact 
  that 
  this 
  

  

  