﻿66 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.. 
  67 
  

  

  apically 
  the 
  end 
  slightly 
  convex; 
  seventh 
  tergite 
  semi-circular; 
  

   eighth 
  a 
  little 
  longer, 
  depressed 
  medianly 
  and 
  emarginate 
  apically. 
  

  

  Length, 
  4.5-5.5 
  mm. 
  

  

  Data 
  for 
  specimens 
  examined 
  : 
  La 
  Valli 
  Province, 
  Buenos 
  Aires, 
  

   Argentina, 
  May 
  15, 
  1920, 
  B. 
  S. 
  Donaldson 
  (McAtee) 
  ; 
  Brazil, 
  on 
  

   orchids, 
  H. 
  B. 
  Shaw 
  (U.S.N.M.) 
  ; 
  Teneriffe, 
  Canary 
  Ids., 
  A. 
  Cab- 
  

   rera; 
  Laguna, 
  Oct. 
  1, 
  1910 
  (Bueno). 
  

  

  PLOIARIA 
  APTERA, 
  new 
  species. 
  

  

  Female. 
  — 
  Much 
  paler 
  than 
  marginata, 
  the 
  dorsum 
  of 
  thorax 
  but 
  

   little 
  darker 
  than 
  the 
  venter. 
  

  

  Head 
  as 
  in 
  the 
  preceding 
  species, 
  but 
  the 
  eyes 
  comparatively 
  

   larger 
  and 
  the 
  subapical 
  antennal 
  segment 
  appreciably 
  longer 
  than 
  

   the 
  apical. 
  Fore 
  coxae, 
  femora, 
  and 
  tibiae 
  similar 
  in 
  lengths 
  to 
  those 
  

   of 
  marginata, 
  the 
  postero-ventral 
  long 
  and 
  short 
  spines 
  in 
  an 
  almost 
  

   straight 
  series, 
  only 
  two 
  or 
  three 
  of 
  the 
  short 
  spines 
  between 
  each 
  

   pair 
  of 
  the 
  long 
  spines 
  and 
  none 
  opposite 
  their 
  bases; 
  there 
  is 
  an 
  

   isolated 
  spine 
  near 
  base 
  on 
  antero-ventral 
  surface, 
  the 
  antero-ventral 
  

   series 
  of 
  setulae 
  on 
  apical 
  half 
  of 
  tibia 
  is 
  stronger 
  than 
  in 
  marginata. 
  

   Abdomen 
  ovate, 
  distorted 
  in 
  type, 
  but 
  evidently 
  lacking 
  well 
  de- 
  

   veloped 
  median 
  processes 
  on 
  hind 
  margins 
  of 
  tergites. 
  

  

  Length, 
  5.5 
  mm. 
  

  

  Holotype. 
  — 
  Female, 
  Galiuro 
  Mountains, 
  Ariz., 
  May 
  24, 
  H. 
  G. 
  

   Hubbard 
  (U.S.N.M.). 
  

  

  This 
  and 
  the 
  preceding 
  species 
  lack 
  wing 
  pads, 
  the 
  present 
  one 
  

   having 
  a 
  very 
  faint 
  ridge 
  on 
  each 
  posterior 
  lateral 
  angle 
  of 
  meso- 
  

   notum 
  and 
  metanotum 
  which 
  may 
  represent 
  the 
  wing 
  pads. 
  AVe 
  

   know 
  of 
  no 
  American 
  species 
  of 
  this 
  genus 
  except 
  these 
  two 
  in 
  which 
  

   the 
  adults 
  have 
  neither 
  wings 
  nor 
  wing 
  pads. 
  

  

  Genus 
  GARDENA 
  Dohrn. 
  

  

  Gardena 
  Dohbn, 
  A., 
  Emesina, 
  1860, 
  p. 
  214, 
  monobasic, 
  genotype 
  G. 
  melwar- 
  

   thrum 
  Dohrn 
  [Ceylon.] 
  ; 
  Nachtrage 
  1873. 
  p. 
  64. 
  — 
  Champion, 
  G. 
  C. 
  Biologia 
  

   vol. 
  2, 
  p. 
  167, 
  1898. 
  

  

  As 
  amplified 
  in 
  the 
  Nachtrage, 
  Dohrn's 
  characterization 
  of 
  Gardena 
  

   may 
  be 
  accepted 
  in 
  the 
  sense 
  of 
  Champion 
  for 
  American 
  species. 
  

   However, 
  there 
  remains 
  one 
  notable 
  discrepancy 
  to 
  be 
  explained; 
  

   Dohrn 
  describes 
  the 
  prothorax 
  as 
  being 
  subequal 
  in 
  length 
  to 
  the 
  

   mesothorax 
  and 
  metathorax 
  together. 
  Measured 
  on 
  the 
  median 
  

   dorsal 
  surface 
  the 
  prothorax 
  in 
  American 
  species 
  is 
  twice 
  or 
  more 
  

   than 
  twice 
  as 
  long 
  as 
  the 
  other 
  divisions 
  of 
  the 
  thorax 
  together. 
  

   However, 
  illustrations 
  of 
  Asiatic 
  species 
  show 
  the 
  same 
  condition, 
  so 
  

   the 
  discrepancy 
  probably 
  is 
  due 
  to 
  error 
  or 
  is 
  to 
  be 
  explained 
  by 
  

   difference 
  in 
  method 
  of 
  taking 
  the 
  measurements. 
  

  

  