﻿64 
  

  

  DRS. 
  A. 
  INGRAM 
  AND 
  J. 
  W. 
  S. 
  MACFIE. 
  

  

  Near 
  the 
  posterior 
  angle 
  of 
  the 
  7th 
  segment 
  is 
  a 
  tuft 
  of 
  three 
  or 
  four 
  (2 
  to 
  5) 
  hairs 
  

   which 
  are 
  subplumose 
  towards 
  their 
  tips. 
  This 
  tuft 
  is 
  a 
  little 
  shorter 
  than 
  the 
  tuft 
  

   on 
  the 
  8th 
  segment, 
  measuring 
  about 
  one-sixth 
  or 
  one-seventh 
  the 
  length 
  of 
  the 
  

   paddle. 
  Near 
  the 
  posterior 
  angles 
  of 
  the 
  segments 
  anterior 
  to 
  the 
  7th 
  there 
  are, 
  

   as 
  a 
  rule, 
  single 
  hairs, 
  occasionally 
  double 
  hairs. 
  

  

  In 
  addition 
  to 
  the 
  tufts 
  and 
  hairs 
  already 
  described, 
  there 
  are 
  on 
  the 
  dorsal 
  aspect 
  

   of 
  the 
  abdominal 
  segments 
  a 
  number 
  of 
  other 
  hairs 
  which 
  are 
  for 
  the 
  most 
  part 
  feebly 
  

   developed; 
  the 
  most 
  notable 
  are 
  those 
  occupying 
  positions 
  corresponding 
  to 
  the 
  hairs 
  

   of 
  the 
  outer 
  lateral 
  row, 
  which 
  on 
  the 
  4th 
  to 
  the 
  6th 
  segments 
  are 
  long 
  and 
  usually 
  

   single 
  or 
  double. 
  The 
  hairs 
  corresponding 
  to 
  those 
  of 
  the 
  inner 
  lateral 
  row 
  on 
  the 
  

   4th 
  to 
  the 
  6th 
  segments 
  are 
  quite 
  insignificant 
  tufts 
  or 
  hairs 
  ; 
  a 
  similar 
  tuft 
  is 
  present 
  

   on 
  the 
  3rd 
  segment, 
  with 
  a 
  single 
  hair 
  of 
  moderate 
  length 
  above 
  and 
  a 
  little 
  external 
  

   to 
  it. 
  The 
  dendritic 
  hairs 
  or 
  tufts 
  on 
  the 
  1st 
  and 
  2nd 
  segments 
  are 
  rather 
  feebly 
  

   developed, 
  those 
  on 
  the 
  2nd 
  segment 
  being 
  small 
  and 
  poorly 
  chitinised. 
  

  

  Pig. 
  4. 
  Pupa 
  of 
  Ochleroiatus 
  nigeriensis, 
  Theo. 
  

  

  The 
  respiratory 
  trumpets 
  are 
  about 
  6 
  mm. 
  long 
  ; 
  they 
  have 
  wide 
  mouths. 
  The 
  

   ratio 
  of 
  the 
  length 
  of 
  the 
  closed 
  portion, 
  the 
  meatus, 
  to 
  the 
  total 
  length 
  of 
  the 
  trumpet 
  

   is 
  about 
  1 
  to 
  1 
  5. 
  

  

  Diagnosis. 
  — 
  The 
  pupa 
  of 
  0. 
  nigeriensis 
  resembles 
  very 
  closely 
  that 
  of 
  the 
  preceeding 
  

   species, 
  0. 
  hirsutus, 
  and 
  both 
  fall 
  into 
  the 
  group 
  in 
  our 
  key 
  which 
  includes 
  0. 
  minutus, 
  

   0. 
  punctothoracis,,&nd 
  0. 
  caliginosus, 
  species 
  hitherto 
  described 
  in 
  insufficient 
  detail 
  

   to 
  be 
  differentiated. 
  0. 
  nigeriensis 
  may 
  show 
  a 
  few 
  minute 
  teeth 
  on 
  the 
  external 
  

   border 
  of 
  the 
  paddle 
  which 
  might 
  be 
  regarded 
  as 
  a 
  fringe, 
  but 
  the 
  tufts 
  at 
  the 
  posterior 
  

   angles 
  of 
  the 
  8th 
  and 
  7th 
  segments 
  are 
  sufficient 
  to 
  separate 
  this 
  species 
  from 
  

   0. 
  albocephalus. 
  No 
  very 
  satisfactory 
  means 
  has 
  been 
  found 
  for 
  distinguishing 
  the 
  

   pupae 
  of 
  0. 
  hirsutus 
  and 
  0. 
  nigeriensis, 
  but 
  perhaps 
  the 
  hairs 
  of 
  the 
  inner 
  lateral 
  

   row 
  on 
  the 
  7th 
  and 
  6th 
  segments 
  would 
  serve, 
  although 
  they 
  are 
  inconspicuous. 
  

  

  Habitat. 
  — 
  The 
  pupae 
  of 
  this 
  mosquito 
  were 
  found 
  in 
  a 
  borrow-pit 
  containing 
  

   slightly 
  muddy 
  water 
  outside 
  the 
  village 
  of 
  Ulu, 
  Lorha 
  District, 
  Northern 
  Territories 
  

   of 
  the 
  Gold 
  Coast, 
  7.vii.l918. 
  

  

  