﻿220 
  

  

  BRITISH 
  LEPIDOPTERA. 
  

  

  Meyr., 
  "Trans. 
  Ent. 
  Soe. 
  Lond.," 
  p. 
  486 
  (1890); 
  "Handbook," 
  etc., 
  p. 
  434 
  

   (1895); 
  Hodg., 
  "Ent. 
  Eec," 
  iii., 
  p. 
  186 
  (1892); 
  Hofmn., 
  "Deutsch. 
  Pteroph.," 
  

   p. 
  53 
  (1895) 
  ; 
  Fernald, 
  " 
  Pter. 
  N. 
  Amer.," 
  p. 
  33, 
  revd. 
  ed. 
  p. 
  34 
  (1898) 
  ; 
  Staud. 
  

   andEeb., 
  " 
  Cat.," 
  3rd 
  ed., 
  p. 
  72 
  (1901); 
  Dyar, 
  "List 
  N. 
  Amer. 
  Lep.," 
  p. 
  444 
  

   (1902). 
  Stenoptilia, 
  Stphs., 
  "111.," 
  iv., 
  p. 
  375 
  (1834). 
  Platyptilus, 
  Zell., 
  

   "Isis," 
  pp. 
  770, 
  775 
  (1841) 
  ; 
  H.-Sch., 
  " 
  Sys.Bearb.," 
  v., 
  p. 
  367 
  (1855) 
  ; 
  Wallgrn., 
  

   " 
  Skand. 
  Fjadermott," 
  p. 
  11 
  (1859) 
  ; 
  Ross., 
  " 
  Wien. 
  Ent. 
  Monats.," 
  viii.,pp. 
  53-54 
  

   (1864); 
  Jord., 
  "Ent. 
  Mo. 
  Mag.," 
  vi., 
  p. 
  121 
  (1869); 
  xviii., 
  pp. 
  74-75 
  (1881); 
  

   Nolck., 
  " 
  Lep. 
  Fn. 
  Est.," 
  pp. 
  783, 
  800 
  (1871) 
  ; 
  Walsm., 
  "Pter. 
  Cat. 
  Oreg.," 
  p. 
  3, 
  

   pi. 
  i., 
  fig. 
  3 
  (1880); 
  Jord., 
  "Ent. 
  Mo. 
  Mag.," 
  xviii., 
  pp. 
  74-75 
  (1881); 
  Barr., 
  

   "Lep. 
  Brit. 
  Isles," 
  ix., 
  p. 
  346, 
  pi. 
  413, 
  figs. 
  3-3c 
  (1904). 
  Platyptila, 
  Barr., 
  

   " 
  Ent. 
  Mo. 
  Mag.," 
  xviii., 
  p. 
  177 
  (1882). 
  

  

  The 
  genus 
  Gillmeria, 
  created 
  in 
  1905 
  (Ent. 
  Record, 
  xvii., 
  p. 
  37), 
  

   in 
  order 
  to 
  separate 
  it 
  from 
  the 
  closely 
  allied 
  genus 
  Platyptilia, 
  from 
  

   which, 
  however, 
  it 
  differs 
  in 
  certain 
  marked 
  characters, 
  had 
  already 
  

   been 
  placed 
  in 
  a 
  separate 
  section 
  of 
  the 
  latter 
  genus 
  by 
  Her 
  rich 
  -Schaffer 
  

   (antea, 
  p. 
  83), 
  Hofmann 
  (antea, 
  p. 
  160), 
  and 
  Wallengren 
  (antea, 
  p. 
  86). 
  

   Herrich-Schaffer's 
  diagnosis 
  of 
  the 
  group 
  (Sys. 
  Bearb., 
  v., 
  p. 
  367) 
  is 
  : 
  

  

  Lobus 
  alarum 
  posteriorum 
  interior 
  concolor, 
  ante 
  medium 
  aut 
  in 
  medio 
  

   dentatus. 
  Palpi 
  et 
  fasciculus 
  frontalis 
  capite 
  duplo 
  longiora 
  — 
  ochrodactylus, 
  Hb. 
  

  

  Wallengren's 
  sectional 
  diagnosis 
  (Kong. 
  Svensk. 
  Vatens. 
  Akad. 
  Hand., 
  

   iii.), 
  referring 
  to 
  Gillmeria, 
  reads 
  : 
  

  

  Frontal 
  tuft 
  rather 
  long. 
  Palpi 
  with 
  the 
  terminal 
  joint 
  rather 
  long, 
  somewhat 
  

   drooping. 
  Tibiae 
  slender 
  — 
  P. 
  ochrodactylus, 
  Hb. 
  

  

  Hofmann's 
  differentiation 
  (Die 
  deutsch. 
  Pteroph., 
  p. 
  40) 
  is 
  as 
  

   follows 
  : 
  

  

  Palpi 
  and 
  frontal 
  tuft 
  much 
  longer 
  than 
  the 
  head 
  ; 
  the 
  frontal 
  tuft 
  reaches 
  to 
  

   the 
  tips 
  of 
  the 
  palpi 
  ; 
  upper 
  lobe 
  very 
  acute 
  ; 
  fringes 
  with 
  darker 
  basal 
  line. 
  

   Yellow 
  species. 
  

  

  1. 
  Ochreous-yellow, 
  usually 
  with 
  very 
  distinctly 
  expressed 
  brown 
  markings 
  — 
  

  

  ochrodactyla, 
  Hb. 
  

  

  2. 
  Almost 
  unicolorous, 
  rusty-yellow, 
  without 
  clearly 
  expressed 
  markings 
  — 
  

  

  bertrami, 
  Boss. 
  

  

  Our 
  own 
  diagnosis 
  (antea, 
  p. 
  160) 
  of 
  Gillmeria 
  may 
  be 
  extended 
  to 
  

   read 
  : 
  

  

  Imago. 
  — 
  Palpi 
  and 
  frontal 
  tuft 
  longer 
  than 
  the 
  head 
  ; 
  the 
  terminal 
  joint 
  of 
  the 
  

   palpi 
  rather 
  long 
  and 
  drooping. 
  With 
  the 
  tuft 
  of 
  black 
  scales 
  on 
  the 
  third 
  plumule 
  

   of 
  hindwing 
  ill-developed 
  (sometimes 
  absent). 
  The 
  dark 
  costal 
  triangle 
  ill- 
  

   developed 
  and 
  more 
  or 
  less 
  obsolete. 
  

  

  Pupa. 
  — 
  The 
  nose-spine 
  much 
  longer, 
  (0'8mm.), 
  than 
  in 
  Platyptilia 
  (isodac- 
  

   tylus 
  and 
  gonodactylu) 
  (0'25mm.), 
  directed 
  more 
  forwards 
  ; 
  the 
  dorsal 
  line, 
  instead 
  

   of 
  proceeding 
  in 
  its 
  curved 
  ventral 
  sweep, 
  bends 
  forwards 
  along 
  the 
  dorsum 
  of 
  the 
  

   spines 
  ; 
  posterior 
  border 
  of 
  abdominal 
  segments 
  quite 
  smooth 
  ; 
  a 
  plentiful 
  supply 
  

   of 
  hooks 
  in 
  the 
  forward 
  part 
  of 
  cremaster 
  (almost 
  absent 
  in 
  Platyptilia) 
  ; 
  the 
  pupal 
  

   pattern 
  of 
  the 
  markings 
  differ 
  (but 
  owing 
  to 
  variation 
  not 
  easy 
  to 
  define) 
  ; 
  the 
  

   prominences 
  of 
  the 
  dorsal 
  ridges 
  much 
  more 
  conspicuous 
  (than 
  in 
  Platyptilia, 
  or 
  in 
  

   fact, 
  than 
  in 
  any 
  other 
  plume 
  pupa). 
  

  

  Larva.— 
  Form, 
  outline 
  and 
  colouring 
  very 
  similar 
  (to 
  Platyptilia). 
  Skin- 
  

   hairs, 
  over 
  whole 
  surface, 
  divided 
  into 
  alternating 
  areas, 
  in 
  which 
  hairs 
  and 
  skin- 
  

   points 
  are 
  — 
  (1) 
  dark, 
  and 
  (2) 
  transparent 
  and 
  colourless 
  (in 
  Platyptilia, 
  skin-hairs 
  

   dark, 
  some 
  areas 
  of 
  skin 
  without 
  them) 
  ; 
  proleg 
  hooks 
  (10-12) 
  more 
  numerous 
  than 
  

   in 
  Platyptilia 
  (8-10) 
  ; 
  proleg 
  hooks 
  with 
  attached 
  ends 
  squarely 
  transverse, 
  and 
  

   consequently 
  broad, 
  the 
  column 
  rather 
  longer 
  (than 
  in 
  Platyptilia) 
  ; 
  the 
  head, 
  

   dorsal 
  plates 
  and 
  legs 
  pale 
  ochreous 
  or 
  nearly 
  colourless 
  (not 
  black 
  as 
  in 
  Platyp- 
  

   tilia) 
  ; 
  the 
  meso- 
  and 
  metathoracic 
  setae 
  paired, 
  but 
  quite 
  separate, 
  and 
  without 
  

   basal 
  plates 
  (in 
  Platyptilia 
  each 
  pair 
  on 
  common 
  plate), 
  bases 
  surrounded 
  by 
  skin- 
  

   hairs 
  ; 
  the 
  hairs 
  in 
  each 
  pair 
  widely 
  separate 
  ; 
  these 
  setae 
  more 
  distinctly 
  transverse 
  

   round 
  segment 
  ; 
  no 
  plates 
  on 
  the 
  8th 
  and 
  9th 
  abdominal 
  segments. 
  

  

  The 
  two 
  species 
  in 
  this 
  genus 
  appear 
  to 
  be 
  essentially 
  more 
  or 
  less 
  

   phytophagic 
  — 
  ochrodactyla 
  being 
  almost 
  confined 
  to 
  Tanacetum, 
  palli- 
  

   dactyla 
  to 
  Achillea. 
  That 
  they 
  are 
  distinct 
  species 
  is 
  clear 
  from 
  the 
  

  

  