﻿22 
  Mr. 
  R. 
  S. 
  BaCTiiall 
  on 
  new 
  Thysanoptera. 
  

  

  IV. 
  — 
  Brief 
  Descriptions 
  of 
  new 
  Thysanoptera. 
  — 
  II. 
  By 
  

   Richard 
  S. 
  Bagnall, 
  F.L.S., 
  F.E.S. 
  (Hops 
  Depait- 
  

   iiieiit 
  of 
  Zoology, 
  University 
  Museum, 
  Oxford). 
  

  

  Suborder 
  T 
  E 
  R 
  E 
  B 
  R 
  A 
  N 
  T 
  I 
  A. 
  

  

  Family 
  Thripidas. 
  

   Scirtothrlps 
  sigjiipenni^, 
  sp. 
  n. 
  

  

  $ 
  .—Length 
  1*2 
  mm. 
  

  

  Light 
  lemon-yellow, 
  first 
  antennal 
  joint 
  almost 
  white, 
  5 
  

   distally 
  very 
  lighily 
  tinged 
  with 
  grey, 
  6 
  with 
  distal 
  two- 
  

   thirds 
  (or 
  thereabouts) 
  and 
  7 
  and 
  8 
  wholly 
  grey-brown. 
  

   Fore-wings 
  grey-brown, 
  second 
  and 
  apical 
  fifths 
  white 
  or 
  

   light 
  gi'ey 
  ; 
  hind-wings 
  with 
  middle 
  brown, 
  corresponding 
  to 
  

   the 
  long 
  dark 
  patch 
  of 
  upper 
  wing. 
  

  

  Head 
  transverse, 
  about 
  0'8 
  as 
  long 
  as 
  broad. 
  Eyes 
  rather 
  

   large 
  and 
  coarsely 
  facetted, 
  pigment 
  very 
  deep 
  purplish 
  

   black 
  ; 
  ocelli 
  with 
  crimson 
  crescentic 
  margins. 
  Antennae 
  

   twice 
  as 
  long 
  as 
  the 
  head, 
  slender 
  ; 
  relative 
  lengths 
  of 
  joints 
  

   approximately 
  :— 
  16 
  : 
  22 
  : 
  32 
  : 
  30 
  : 
  32 
  : 
  32 
  : 
  7 
  : 
  13—1 
  and 
  2 
  

   much 
  broader 
  than 
  any 
  of 
  the 
  following, 
  and 
  6 
  not 
  divided. 
  

   Double 
  trichomes 
  on 
  3 
  and 
  4 
  long 
  and 
  very 
  slender. 
  J\louth- 
  

   cone 
  short, 
  brown 
  at 
  tip 
  ; 
  maxillary 
  pal[)i 
  3-jointed, 
  joints 
  2 
  

   and 
  3 
  practically 
  subequal 
  in 
  length. 
  

  

  Prothorax 
  about 
  as 
  long 
  as 
  head 
  and 
  about 
  1*6 
  limes 
  as 
  

   broad 
  as 
  long, 
  surface 
  sparsely 
  and 
  irregularly 
  set 
  with 
  very 
  

   minute 
  setae 
  ; 
  one 
  postero-marginal 
  spine 
  near 
  each 
  hind- 
  

   angle, 
  short, 
  only 
  0*25 
  the 
  length 
  of 
  prothorax. 
  Legs 
  

   somewhat 
  stout, 
  hind-tibia 
  with 
  a 
  series 
  of 
  moderately 
  fine 
  

   spines 
  on 
  distal 
  half 
  within, 
  and 
  tarsus 
  with 
  a 
  series 
  of 
  similar 
  

   spines 
  near 
  apex. 
  Pterothorax 
  nearly 
  1'45 
  times 
  as 
  broad 
  as 
  

   the 
  prothorax, 
  and 
  about 
  as 
  long 
  as 
  broad. 
  Wings 
  slender, 
  

   reaching 
  only 
  to 
  the 
  sixth 
  abdominal 
  segment 
  ; 
  cilia 
  fuscous, 
  

   those 
  o£ 
  hind 
  margins 
  very 
  long 
  ; 
  fore-wing 
  with 
  three 
  

   minute, 
  widely 
  spaced 
  setse 
  on 
  distal 
  half 
  of 
  upper 
  vein, 
  and 
  

   lower 
  vein 
  with 
  but 
  four 
  setai. 
  Hind-wing 
  with 
  median 
  vein 
  

   continued 
  ahnost 
  to 
  apex, 
  very 
  prominent 
  through 
  dark 
  area. 
  

   Abdomen 
  elongate-ovate, 
  dorsal 
  surface 
  finely 
  and 
  wavily 
  

   striate, 
  in 
  parts 
  reticulate; 
  segments 
  [) 
  and 
  10 
  with 
  mod- 
  

   erately 
  long 
  and 
  rather 
  fine 
  bristles, 
  9 
  being 
  furnished 
  with 
  a 
  

   shorter 
  dorsal 
  pair 
  which 
  are 
  somewhat 
  widely 
  separated. 
  

  

  