﻿342 
  PROCEEDIJ^'GS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  Genus 
  OSMYLIDIA 
  Cockerell. 
  

  

  OSMYLIDIA 
  REQUIETA 
  (Scudder). 
  

  

  Osmylus 
  requietus 
  Scudder, 
  Tertiary 
  In.socts 
  N. 
  America, 
  1890, 
  p. 
  162. 
  

   Osmylidia 
  requieta 
  (Scudder), 
  Cockerell, 
  Canadian 
  Entomologist, 
  vol. 
  40, 
  1908, 
  

   p. 
  342. 
  

  

  Scudder 
  described 
  one 
  of 
  the 
  Florissant 
  Osmylids 
  as 
  Osmylus 
  

   requietus. 
  He 
  prefaced 
  his 
  account^ 
  with 
  the 
  following 
  remarks: 
  

  

  The 
  species 
  we 
  have 
  placed 
  here 
  agrees 
  somewhat 
  closely 
  with 
  the 
  species 
  from 
  

   amber, 
  Osmylus 
  piclus, 
  referred 
  by 
  Hagen 
  to 
  this 
  genus, 
  but 
  differs 
  from 
  it 
  in 
  its 
  

   lack 
  of 
  any 
  diverse 
  coloring 
  in 
  the 
  wings, 
  as 
  well 
  as 
  in 
  some 
  minor 
  points 
  of 
  the 
  

   neuration, 
  as 
  in 
  the 
  distance 
  of 
  the 
  outer 
  series 
  of 
  gradate 
  veinlets 
  from 
  the 
  outer 
  

   border 
  of 
  the 
  wing, 
  their 
  regular 
  connection 
  with 
  one 
  of 
  the 
  basal 
  branches 
  of 
  the 
  

   radius, 
  the 
  regularity 
  of 
  the 
  inner 
  series 
  of 
  gradate 
  veinlets, 
  as 
  well 
  as 
  the 
  structure 
  

   of 
  the 
  cubital 
  region. 
  The 
  two 
  Tertiary 
  species, 
  however, 
  agree 
  together, 
  and 
  dis- 
  

   agree 
  with 
  the 
  living 
  types 
  in 
  the 
  simple 
  cliaracter 
  of 
  the 
  costal 
  nervules, 
  the 
  much 
  

   smaller 
  number 
  of 
  sectors, 
  and 
  the 
  character 
  of 
  the 
  basal 
  half 
  of 
  the 
  wing, 
  where 
  the 
  

   sectorial 
  interspaces 
  are 
  regular 
  and 
  broken 
  by 
  few 
  and 
  irregularly 
  scattered 
  cross 
  

   veins, 
  instead 
  of 
  being 
  so 
  numerously 
  supplied 
  as 
  to 
  break 
  up 
  the 
  field 
  into 
  an 
  

   almost 
  uniform 
  and 
  minute 
  reticulation. 
  The 
  two 
  fossil 
  species 
  would 
  therefore 
  

   appear 
  to 
  form 
  a 
  section 
  apart. 
  

  

  I 
  found 
  Osmylus 
  requietus 
  Scudder 
  in 
  the 
  shale 
  at 
  station 
  13 
  of 
  the 
  

   Florissant 
  region. 
  The 
  specimen 
  agreed 
  with 
  Scudder's 
  type, 
  except 
  

   that 
  it 
  was 
  a 
  little 
  smaller, 
  the 
  wings 
  14 
  mm. 
  long 
  instead 
  of 
  over 
  15. 
  

  

  Fig. 
  1.— 
  Venation 
  of 
  GsMVLn^iA 
  eequieta 
  (Scudder). 
  

  

  The 
  insect 
  differs 
  conspicuously 
  from 
  typical 
  Osmylus 
  in 
  the 
  -cliar- 
  

   acters 
  mentioned 
  by 
  Scudder, 
  and 
  on 
  it 
  I 
  founded 
  a 
  new 
  genus 
  

   Osmylidia.^ 
  Wliether 
  the 
  species 
  from 
  Baltic 
  amber 
  sliould 
  be 
  con- 
  

   sidered 
  strictly 
  cogeneric, 
  I 
  will 
  not 
  venture 
  to 
  decide. 
  In 
  many 
  of 
  

   its 
  characters 
  this 
  genus 
  resembles 
  the 
  very 
  much 
  older 
  NympMtes 
  

   cramcH 
  Haase, 
  from 
  the 
  lithographic 
  stone 
  of 
  Bavaria; 
  indeed, 
  it 
  

   may 
  fairly 
  be 
  said 
  that 
  Osmylidia 
  is 
  intermediate 
  between 
  Nymphites 
  

   of 
  the 
  Jurassic 
  and 
  Osmylus 
  of 
  the 
  present 
  day. 
  

  

  » 
  Tertiary 
  Insects, 
  p. 
  162. 
  2 
  Can. 
  Ent., 
  vol. 
  40, 
  1908, 
  p. 
  342. 
  

  

  