﻿art. 
  1 
  AMERICAN 
  PLOIARIINAE 
  McATEE 
  AND 
  MALLOCH 
  65 
  

  

  on 
  all 
  tergites, 
  that 
  on 
  five 
  most 
  prominent; 
  eighth 
  tergite 
  concave 
  

   apically, 
  without 
  process. 
  

  

  PLOIARIA 
  MARGINATA 
  (Heineken). 
  

  

  Cerascopus 
  marginatus 
  Heineken, 
  C. 
  Zool. 
  Journ., 
  Jan.-May, 
  1829 
  (1830), 
  

   pp. 
  36-40, 
  pi. 
  2, 
  fig. 
  5 
  [Madeira]. 
  

  

  Cerascopus 
  canariensis 
  Noualhier, 
  Maurice. 
  Note 
  sur 
  le 
  genre 
  Ploiaria 
  

   Scop. 
  Reiit. 
  (Emesodema 
  Spin., 
  Cerascopus 
  Hein.) 
  et 
  description 
  de 
  quatre 
  

   especes 
  nouvelles 
  palearctiques. 
  Rev. 
  d'Ent, 
  vol. 
  14, 
  1S95, 
  p. 
  168 
  [Canary 
  

   Islands]. 
  

  

  Male. 
  — 
  Brownish 
  fuscous, 
  with 
  a 
  longitudinal 
  central 
  line 
  on 
  head 
  

   and 
  thorax, 
  two 
  round 
  spots 
  on 
  each 
  lobe 
  of 
  head 
  and 
  upper 
  sides 
  

   of 
  pronotum, 
  the 
  lateral 
  margins 
  of 
  pronotum 
  and 
  mesonotum 
  and 
  

   ventral 
  surface 
  of 
  head 
  and 
  thorax 
  yellowish. 
  Antennae 
  and 
  legs 
  

   brownish 
  yellow, 
  darker 
  just 
  before 
  apices 
  of 
  femora 
  and 
  yellowish 
  

   at 
  apices. 
  

  

  Antennae 
  short-hispid, 
  apical 
  segment 
  about 
  1.75 
  as 
  long 
  as 
  sub- 
  

   apical; 
  eyes 
  small, 
  not 
  occupying 
  over 
  half 
  the 
  height 
  of 
  head, 
  and 
  

   shorter 
  than 
  distance 
  from 
  their 
  hind 
  margin 
  to 
  posterior 
  margin 
  

   of 
  head, 
  surface 
  of 
  head 
  microscopically 
  granulose; 
  fore 
  coxa 
  as 
  

   long 
  as 
  pronotum 
  and 
  about 
  two 
  thirds 
  as 
  long 
  as 
  fore 
  tibia, 
  with 
  

   microscopic 
  subdecumbent 
  hairs, 
  but 
  not 
  granulose; 
  fore 
  femur 
  stout, 
  

   surface 
  as 
  in 
  coxa, 
  outer 
  series 
  of 
  strong 
  spines 
  on 
  posterodorsal 
  

   surface 
  numbering 
  four 
  or 
  five, 
  their 
  bases 
  elevated, 
  their 
  entire 
  

   length 
  not 
  greater 
  than 
  diameter 
  of 
  femur, 
  the 
  inner 
  series 
  not 
  

   interrupted 
  opposite 
  bases 
  of 
  the 
  strong 
  spines, 
  consisting 
  of 
  many 
  

   closely 
  placed 
  setulae; 
  antero- 
  ventral 
  series 
  with 
  no 
  isolated 
  bristle 
  

   at 
  or 
  near 
  base 
  as 
  in 
  the 
  species 
  which 
  have 
  the 
  tarsus 
  falling 
  short 
  

   of 
  apex. 
  of 
  coxa; 
  tibia 
  two 
  thirds 
  as 
  long 
  as 
  femur, 
  the 
  antero-ventral 
  

   and 
  postero-ventral 
  hairs 
  short; 
  tarsus 
  extending 
  to 
  middle 
  of 
  

   trochanter, 
  fully 
  half 
  as 
  long 
  as 
  tibia, 
  basal 
  segment 
  without 
  evi- 
  

   dent 
  setulae. 
  Pronotum 
  with 
  a 
  rounded 
  low 
  tubercle 
  each 
  side 
  of 
  

   neck, 
  tapered 
  posteriorly, 
  constricted 
  just 
  behind 
  anterior 
  margin, 
  

   widest 
  in 
  front 
  of 
  middle, 
  a 
  distinct 
  constriction 
  between 
  pronotum 
  

   and 
  mesonotum, 
  the 
  latter 
  widening 
  to 
  above 
  coxal 
  insertions, 
  with 
  

   a 
  median 
  linear 
  sulcus 
  and 
  slight 
  longitudinal 
  ridge 
  along 
  each 
  side 
  

   of 
  dorsum 
  separating 
  the 
  pale 
  color 
  of 
  disk 
  from 
  the 
  dark 
  sides. 
  

   Abdominal 
  tergites 
  without 
  processes, 
  the 
  spiracles 
  on 
  top 
  of 
  con- 
  

   nexival 
  fold, 
  the 
  apical 
  tergite 
  with 
  hind 
  margin 
  rounded; 
  hypo- 
  

   pygium 
  as 
  in 
  figure 
  93, 
  the 
  claspers 
  farther 
  from 
  apex 
  than 
  in 
  any 
  

   of 
  the 
  other 
  species 
  seen 
  and 
  the 
  apical 
  hook 
  larger. 
  

  

  Female. 
  — 
  Differs 
  from 
  male 
  chiefly 
  in 
  character 
  of 
  abdomen, 
  

   which 
  is 
  broader, 
  especially 
  apically 
  and 
  has 
  the 
  spiracles 
  on 
  outer 
  

   side 
  of 
  connexival 
  fold; 
  widest 
  part 
  of 
  abdomen 
  about 
  at 
  the 
  junc- 
  

   ture 
  of 
  fourth 
  and 
  fifth 
  tergites, 
  sixth 
  tergite 
  somewhat 
  narrowed 
  

   94993—25 
  5 
  

  

  