﻿184 
  

  

  JAMES 
  WATERSTON\ 
  

  

  ChaetostricSia 
  cratitia, 
  sp. 
  n. 
  

  

  A 
  pale 
  yellow 
  species 
  very 
  faintly 
  infuscated 
  at 
  the 
  bases 
  of 
  the 
  abdominal 
  tergites 
  

   and 
  below 
  the 
  ovipositor. 
  A 
  slight 
  cloud 
  below 
  stigma. 
  Possibly 
  also 
  the 
  tips 
  of 
  the 
  

   tarsi 
  and 
  the 
  antennae 
  towards 
  the 
  apex 
  may 
  be 
  slightly 
  darker 
  than 
  the 
  body. 
  

  

  Head, 
  seen 
  from 
  in 
  front 
  (fig. 
  1, 
  a), 
  about 
  one-fifth 
  broader 
  than 
  deep 
  (23 
  : 
  19). 
  

   Eyes 
  sparsely 
  pilose 
  (fig. 
  I, 
  b), 
  half 
  as 
  long 
  again 
  as 
  the 
  genal 
  keel 
  and 
  separated, 
  at 
  

   their 
  nearest, 
  by 
  rather 
  less 
  than 
  two-thirds 
  of 
  the 
  breadth 
  of 
  the 
  head. 
  Genae 
  long 
  

   and 
  considerably 
  swollen 
  behind 
  the 
  keel. 
  Clypeal 
  edge 
  nearly 
  straight, 
  with 
  a 
  

   slight 
  median 
  notch. 
  Toruli 
  (3 
  : 
  2) 
  well 
  up 
  on 
  the 
  face, 
  their 
  lower 
  edge 
  just 
  on 
  the 
  

   base 
  line 
  of 
  the 
  eyes 
  ; 
  separated 
  by 
  their 
  longer 
  diameter 
  and 
  from 
  the 
  orbit 
  by 
  a 
  

   diameter 
  and 
  one-third. 
  Chaetotaxy 
  as 
  in 
  fig. 
  1, 
  a. 
  Besides 
  the 
  bristles 
  shown 
  there 
  

   are, 
  on 
  each 
  side 
  of 
  the 
  vertex 
  near 
  the 
  stout 
  bristle 
  (touching 
  the 
  orbit), 
  which 
  is 
  

   partly 
  dotted, 
  2 
  minute 
  bristles 
  more 
  remote 
  from 
  the 
  orbit 
  on 
  the 
  occipital 
  slope. 
  

   On 
  each 
  of 
  the 
  swollen 
  genae 
  are 
  some 
  half 
  dozen 
  minute 
  bristles. 
  

  

  Antenna, 
  length, 
  0-4 
  mm. 
  (fig. 
  1, 
  c) 
  ; 
  the 
  scape, 
  pedicel 
  and 
  funicular 
  joint 
  are 
  

   in 
  ratio 
  38 
  : 
  28 
  : 
  17, 
  and 
  the 
  club 
  segments 
  14 
  : 
  IS 
  : 
  22. 
  The 
  breadths 
  of 
  the 
  antennal 
  

   joints 
  vary 
  considerably 
  according 
  to 
  the 
  pressure 
  to 
  which 
  they 
  are 
  subjected 
  ; 
  thus 
  

   on 
  the 
  same 
  scale 
  the 
  breadth 
  of 
  the 
  scape 
  is 
  12-13 
  ; 
  pedicel, 
  10-12; 
  funicle, 
  9^ 
  — 
  1 
  1 
  ; 
  

   club, 
  11-13: 
  11-12 
  (at 
  sutures). 
  The 
  first 
  segment 
  of 
  the 
  club 
  bears 
  7-8 
  long 
  

   bristles 
  in 
  all 
  and 
  no 
  sensoria 
  ; 
  second 
  segment, 
  8-9 
  bristles 
  and 
  2 
  sensoria 
  ; 
  apical 
  

   segment, 
  1 
  lateral 
  bristle, 
  4 
  sensoria, 
  and 
  1 
  stout 
  terminal 
  bristle 
  as 
  long 
  as 
  the 
  

   supporting 
  segment. 
  There 
  are 
  also 
  3 
  minute 
  but 
  stout 
  knob-like 
  sensoria 
  set 
  in 
  

   sockets 
  ; 
  1 
  at 
  the 
  apical 
  ventral 
  angle 
  of 
  the 
  funicular 
  joint, 
  another 
  (lateral) 
  near 
  

   the 
  base, 
  and 
  1 
  laterally 
  on 
  the 
  second 
  club 
  segment, 
  on 
  the 
  suture 
  between 
  it 
  and 
  

   the 
  third. 
  

  

  Mandibles 
  (10 
  : 
  7) 
  similar, 
  tridentate, 
  the 
  long 
  bristle 
  on 
  the 
  ventral 
  edge 
  not 
  

   unusually 
  thickened. 
  Stipes 
  with 
  1 
  long 
  lateral 
  bristle 
  and 
  1 
  median, 
  shorter, 
  

   opposite 
  the 
  base 
  of 
  the 
  palpus. 
  Galea 
  with 
  2 
  stout 
  spinose 
  bristles 
  at 
  side 
  distally 
  

   and 
  about 
  24 
  short 
  fine 
  bristles 
  on 
  inner 
  surface. 
  Mentum 
  with 
  2 
  long 
  bristles 
  ; 
  

   4 
  setigerous 
  cells 
  on 
  lingua. 
  

  

  TEK2I 
  - 
  

  

  Fig. 
  2. 
  Chaetostvicha 
  cratitia, 
  Waterst., 
  $ 
  : 
  from 
  apex 
  of 
  scutellum 
  to 
  hind 
  margin 
  of 
  first 
  

   abdominal 
  segment 
  ; 
  a, 
  detail 
  of 
  structure 
  of 
  first 
  tergite 
  towards 
  hind 
  margin. 
  

  

  