﻿art. 
  1 
  AMERICAN 
  PLOIARIINAE 
  McATEE 
  AND 
  MALLOCH 
  107 
  

  

  carinate 
  on 
  upper 
  third, 
  apex 
  rounded; 
  hind 
  margins 
  of 
  sternites 
  

   2-6 
  emarginate 
  medianly, 
  6 
  most 
  so, 
  this 
  sternite 
  a 
  fourth 
  longer 
  on 
  

   side 
  than 
  on 
  middle 
  (fig. 
  176) 
  ; 
  seventh 
  sternite 
  a 
  third 
  longer 
  than 
  

   sixth 
  on 
  median 
  line, 
  its 
  hind 
  margin 
  convex 
  medianly, 
  concave 
  

   laterally, 
  eighth 
  sternite 
  visible 
  as 
  an 
  elliptical 
  plate 
  on 
  each 
  side, 
  

   or 
  when 
  exposed, 
  rounded 
  emarginate 
  medianly, 
  convex 
  laterally. 
  

  

  Length, 
  17-22 
  mm. 
  

  

  Pair 
  from 
  La 
  Guaila, 
  Venezuela 
  (Coll. 
  E. 
  Bergroth), 
  male, 
  the 
  

   type. 
  Three 
  males, 
  Trinidad, 
  March 
  26, 
  1916, 
  R. 
  A. 
  Wood 
  (Acad. 
  

   Nat. 
  Sci. 
  Phila.) 
  ; 
  one 
  male 
  Botanic 
  Garden, 
  Port-of 
  -Spain, 
  Trini- 
  

   dad, 
  Oct. 
  13, 
  1918, 
  Harold 
  Morrison 
  (U.S.N.M.). 
  

  

  Females 
  agreeing 
  with 
  pascoei 
  in 
  general 
  appearance 
  and 
  in 
  most 
  

   characters 
  but 
  differing 
  in 
  details 
  of 
  eighth 
  and 
  ninth 
  tergites 
  from 
  

   the 
  female 
  assigned 
  to 
  this 
  species 
  by 
  Bergroth 
  are 
  left 
  without 
  

   definite 
  determinations 
  for 
  the 
  present. 
  All 
  of 
  these 
  have 
  the 
  head 
  

   and 
  thorax 
  conspicuously 
  granulate, 
  the 
  sternites 
  finely 
  corrugated 
  

   transversely, 
  and 
  both 
  sternites 
  and 
  tergites 
  up 
  to 
  and 
  including 
  

   7 
  similar 
  to 
  those 
  of 
  pascoei. 
  Three 
  from 
  Trinidad, 
  March 
  26, 
  

   1916, 
  R. 
  A. 
  Wood 
  (Acad. 
  Nat. 
  Sci. 
  Phila.), 
  and 
  one 
  from 
  Mont- 
  

   serrat, 
  Trinidad, 
  June 
  29, 
  A. 
  Busck 
  (U.S.N.M.), 
  have 
  the 
  eighth 
  

   tergite 
  depressed 
  medianly, 
  with 
  transverse 
  wrinkles 
  or 
  irregular 
  

   elevations 
  each 
  side 
  of 
  the 
  depression; 
  and 
  ninth 
  tergite 
  is 
  arcuate 
  

   both 
  transversely 
  and 
  longitudinally, 
  but 
  is 
  depressed 
  apically 
  and 
  

   more 
  or 
  less 
  concave 
  between 
  the 
  apices 
  of 
  the 
  somewhat 
  elevated 
  

   lateral 
  margins. 
  A 
  single 
  female 
  from 
  Ivon 
  Beni, 
  Bolivia, 
  January, 
  

   1922, 
  M. 
  R. 
  Lopez 
  (U.S.N.M.), 
  has 
  the 
  eighth 
  tergite 
  distinctly 
  

   carinate 
  medianly 
  and 
  corrugated 
  transversely 
  on 
  each 
  side; 
  the 
  

   ninth 
  tergite 
  has 
  a 
  median 
  carina 
  above 
  which 
  widens 
  so 
  as 
  to 
  cover 
  

   the 
  whole 
  apex, 
  this 
  part 
  of 
  the 
  tergite 
  being 
  distinctly 
  elevated 
  

   above 
  the 
  sides 
  of 
  the 
  disk, 
  apex 
  truncate. 
  While 
  these 
  variations 
  

   are 
  rather 
  greater 
  than 
  we 
  should 
  expect 
  in 
  a 
  single 
  species, 
  the 
  

   weight 
  of 
  evidence 
  in 
  hand 
  seems 
  to 
  be 
  against 
  attributing 
  them 
  to 
  

   specific 
  distinctness. 
  

  

  GHILIANELLA 
  ALTERATA, 
  new 
  species. 
  

  

  Female. 
  — 
  Dark 
  castaneous; 
  beak, 
  antennae 
  and 
  mid 
  and 
  hind 
  legs 
  

   yellow-brown 
  but 
  unmarked 
  ; 
  frontal 
  spine 
  stramineous. 
  Head 
  and 
  

   thorax 
  copiously 
  granulate 
  and 
  yellowish-white 
  haired 
  ; 
  prothorax 
  

   longest, 
  metathorax 
  shortest 
  of 
  the 
  three 
  divisions. 
  Abdomen 
  

   smoothly 
  clavate, 
  attaining 
  its 
  greatest 
  width 
  at 
  posterior 
  part 
  of 
  

   fourth 
  segment; 
  tergites 
  except 
  1, 
  longer 
  than 
  wide, 
  seventh 
  with 
  

   the 
  posterior 
  angles 
  prominent 
  but 
  not 
  produced, 
  median 
  portion 
  

   declivate 
  and 
  triangularly 
  produced, 
  slightly 
  surpassing 
  lateral 
  

   angles. 
  Eighth 
  tergite 
  short 
  and 
  broad, 
  faintly 
  rugose; 
  ninth 
  much 
  

   longer, 
  narrowing 
  rapidly 
  and 
  rounded 
  apically; 
  middle 
  of 
  apex 
  

  

  