﻿50 
  

  

  JAMES 
  WATERSTOX. 
  

  

  cloud 
  is 
  concave 
  distally, 
  about 
  one-ninth 
  of 
  the 
  wing 
  apically 
  being 
  clear. 
  Hind 
  

   wing 
  hyaline. 
  Abdomen, 
  dark 
  brown, 
  with 
  bluish 
  or 
  violet 
  metallic 
  reflection. 
  

   Ovipositor 
  pale. 
  

  

  Head 
  (fig 
  4, 
  b) 
  wider 
  than 
  deep 
  — 
  about 
  6 
  : 
  5 
  when 
  viewed 
  from 
  in 
  front 
  at 
  right 
  

   angles 
  to 
  the 
  transverse 
  ridge 
  between 
  the 
  upper 
  surface 
  (vertex 
  and 
  frons) 
  and 
  the 
  

   lower 
  frons 
  (scapal 
  hollows 
  and 
  inter-torular 
  area). 
  Upper 
  orbits 
  practically 
  parallel, 
  

   the 
  frons 
  at 
  its 
  narrowest 
  (halfway 
  between 
  the 
  anterior 
  ocellus 
  and 
  the 
  ridge) 
  rather 
  

   less 
  than 
  one-fourth 
  the 
  width 
  of 
  the 
  head. 
  Upper 
  frons 
  smooth, 
  its 
  pattern 
  fine 
  

   and 
  hardly 
  raised. 
  Ocelli 
  in 
  an 
  equilateral 
  triangle 
  ; 
  the 
  posterior 
  pair 
  widely 
  

   separated, 
  each 
  being 
  less 
  than 
  a 
  diameter 
  from 
  the 
  orbit 
  and 
  from 
  1 
  J-2 
  diameters 
  

   from 
  the 
  occipital 
  edge. 
  Inter-torular 
  area 
  smooth 
  and 
  declivous 
  about 
  the 
  mid 
  line, 
  

   but 
  without 
  a 
  definite 
  carina 
  or 
  edge. 
  Antenna 
  (fig. 
  4, 
  a), 
  0"65mm. 
  in 
  length; 
  

   scape 
  (16 
  : 
  7) 
  greatly 
  expanded, 
  widest 
  above 
  the 
  middle, 
  longer 
  than 
  the 
  club, 
  two 
  

   and 
  a 
  half 
  times 
  as 
  long 
  as 
  the 
  pedicel, 
  which 
  is 
  equal 
  to 
  the 
  first 
  three 
  funicular 
  

   joints 
  together 
  ; 
  the 
  first 
  funicular 
  is 
  quadrate, 
  the 
  rest 
  transverse 
  ; 
  club 
  only 
  a 
  

   little 
  shorter 
  (9 
  : 
  10) 
  than 
  the 
  funicle, 
  and 
  though 
  much 
  swollen 
  hardly 
  as 
  broad 
  as 
  

   the 
  scape. 
  Mouth-parts 
  : 
  labrum 
  normal, 
  transverse, 
  short, 
  distinctly 
  concave, 
  

   with 
  six 
  bristles 
  (3, 
  3) 
  ; 
  mandibles 
  (14 
  : 
  9) 
  tridentate 
  ; 
  maxillary 
  palpus, 
  13, 
  9, 
  9, 
  8. 
  

  

  Fig. 
  4. 
  Chilovenrus 
  praenitens, 
  sp. 
  n. 
  : 
  a, 
  antenna 
  ; 
  b. 
  head. 
  

  

  Thorax. 
  In 
  the 
  mesonotum 
  the 
  anterior 
  two-thirds 
  {i.e., 
  up 
  to 
  the 
  dark 
  band) 
  bears 
  

   about 
  30 
  dark 
  bristles, 
  and 
  the 
  surface 
  is 
  entirely 
  covered 
  by 
  a 
  moderately 
  fine 
  raised 
  

   rugose 
  striation 
  — 
  the 
  striae 
  being 
  straight 
  and 
  subparallel. 
  The 
  dark 
  band 
  is 
  covered 
  

   by 
  the 
  usual 
  belt 
  of 
  sword-like 
  hyaline 
  bristles, 
  which 
  lie 
  parallel 
  to 
  one 
  another 
  

   and 
  overlapping, 
  and 
  produce 
  by 
  interference 
  the 
  silvery 
  play 
  visible 
  in 
  this 
  region. 
  

   There 
  are 
  about 
  three 
  rows 
  of 
  these 
  peculiar 
  bristles. 
  ScuteUum 
  with 
  deeply 
  raised 
  

   reticulation. 
  Axillae 
  with 
  five 
  bristles. 
  

  

  Wings. 
  Fore 
  wings 
  (5:2), 
  length, 
  0-9 
  mm., 
  submarginal 
  vein 
  (about 
  five 
  times 
  

   the 
  marginal) 
  bearing 
  five 
  dark 
  and 
  two 
  hyaline 
  bristles 
  before 
  the 
  uprise, 
  on 
  the 
  

   marginal 
  stand 
  18-20 
  dark 
  stout 
  bristles 
  and 
  about 
  half 
  a 
  dozen 
  project 
  at 
  the 
  edge 
  

   from 
  the 
  numerous 
  bristles 
  below. 
  Radius 
  with 
  one 
  bristle 
  near 
  base 
  and 
  one 
  near 
  

   apex 
  Behind 
  the 
  submarginal 
  the 
  wing 
  is 
  nearly 
  bare, 
  there 
  being 
  only 
  3-6 
  fine 
  

   hyaline 
  bristles 
  opposite 
  the 
  two 
  similar 
  bristles 
  on 
  the 
  nervure 
  and 
  about 
  15 
  short 
  

   stout 
  dark 
  bristles 
  in 
  2-3 
  irregular 
  rows 
  on 
  the 
  basal 
  side 
  of 
  the 
  " 
  hairless 
  line." 
  On 
  

   the 
  submarginal 
  cell 
  below 
  are 
  10-12 
  minute 
  hyaline 
  bristles 
  on 
  the 
  basal 
  two-thirds 
  

   and 
  2-3 
  darker 
  and 
  longer 
  ones 
  at 
  the 
  apex. 
  "Hind 
  wings 
  (4:1). 
  length, 
  0-75 
  mm. 
  

  

  