﻿370 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  voL 
  % 
  

  

  with 
  very 
  slight 
  indication 
  of 
  one 
  transverse 
  groove, 
  very 
  slightly 
  

   longer 
  than 
  last 
  tw^o 
  funicular 
  segments 
  combined 
  and 
  a 
  little 
  

   thicker 
  than 
  preceding 
  segment. 
  Pronotum 
  a 
  little 
  longer 
  than 
  

   broad, 
  narroM^ed 
  anteriorly 
  into 
  a 
  distinct 
  neck; 
  mesoscutum 
  

   broader 
  and 
  shorter 
  than 
  pronotum, 
  about 
  tvv^ice 
  as 
  broad 
  as 
  long; 
  

   parapsidal 
  grooves 
  deep, 
  complete, 
  and 
  not 
  foveolate; 
  scutellum 
  

   about 
  as 
  long 
  as 
  mesoscutum, 
  weakly 
  convex 
  ; 
  axillae 
  just 
  meeting; 
  

   axillar 
  furrow 
  not 
  or 
  very 
  weakly 
  foveolated; 
  propodeum 
  not 
  

   declivous, 
  about 
  half 
  as 
  long 
  as 
  scutellum, 
  without 
  either 
  median 
  

   carina 
  or 
  lateral 
  folds 
  and 
  with 
  very 
  shallow 
  spiracular 
  sulci 
  ; 
  

   mesopleuron 
  with 
  a 
  very 
  shallow, 
  nonfoveolated, 
  femoral 
  impres- 
  

   sion; 
  prepectus 
  moderately 
  large, 
  triangular; 
  anterior 
  and 
  pos- 
  

   terior 
  coxae 
  large, 
  subequal 
  ; 
  middle 
  coxae 
  much 
  smaller 
  ; 
  anterior 
  

   femora 
  distinctly 
  swollen, 
  as 
  large 
  as 
  or 
  larger 
  than 
  posterior 
  

   pair 
  ; 
  posterior 
  tibia 
  with 
  two 
  slender, 
  unequal 
  calcaria. 
  Abdomen 
  

   about 
  as 
  long 
  as 
  thorax, 
  somewhat 
  compressed 
  from 
  the 
  sides, 
  

   distinctly 
  petiolate; 
  petiole 
  broader 
  at 
  base 
  than 
  at 
  apex, 
  flat- 
  

   tened 
  and 
  smooth 
  dorsally; 
  basal 
  segment 
  of 
  gaster 
  deeply, 
  tri- 
  

   angularly 
  incised 
  at 
  apical 
  middle; 
  ovipositor 
  sheaths 
  exserted 
  

   about 
  one-fifth 
  to 
  one-third 
  the 
  length 
  of 
  gaster. 
  Forewing 
  about 
  

   three 
  times 
  as 
  long 
  as 
  broad 
  ; 
  marginal 
  vein 
  longer 
  than 
  sub- 
  

   marginal 
  ; 
  stigmal 
  vein 
  approximately 
  twice 
  as 
  long 
  as 
  broad 
  ; 
  

   postmarginal 
  weak 
  and 
  not 
  longer 
  than 
  stigmal; 
  discal 
  cilia 
  

   vestigial; 
  marginal 
  cilia 
  short; 
  juncture 
  of 
  marginal 
  and 
  sub- 
  

   marginal 
  veins 
  with 
  a 
  small 
  but 
  distinct 
  callous 
  but 
  without 
  a 
  

   tuft 
  of 
  bristles. 
  Posterior 
  wing 
  about 
  two-thirds 
  as 
  broad 
  and 
  

   six-sevenths 
  as 
  long 
  as 
  anterior 
  wing. 
  

  

  Male. 
  — 
  Antenna 
  resembling 
  that 
  of 
  female 
  but 
  10-segmented, 
  

   the 
  club 
  distinctly 
  2-segmented 
  and 
  with 
  slight 
  indication 
  of 
  a 
  

   second 
  cross 
  furrow 
  ; 
  first 
  funicular 
  segment 
  nearl.y 
  as 
  long 
  as 
  

   pedicel. 
  Abdomen 
  a 
  little 
  shorter 
  than 
  thorax, 
  compressed 
  dor- 
  

   soventrally, 
  subtruncate 
  at 
  apex, 
  the 
  apical 
  segments 
  retracted; 
  

   petiole 
  a 
  little 
  broader 
  at 
  base 
  than 
  at 
  apex; 
  basal 
  segment 
  of 
  

   gaster 
  not 
  so 
  deeply 
  incised 
  at 
  apical 
  middle 
  as 
  in 
  female. 
  Other- 
  

   wise 
  like 
  female. 
  

  

  Type 
  of 
  the 
  genus. 
  — 
  Cerocephala 
  atroviolacea 
  Crawford. 
  

  

  ACEROCEPHALA 
  ATROVIOLACEA 
  (Crawford), 
  new 
  comhinolion 
  

  

  Plate 
  48, 
  Figure 
  5 
  

  

  Cerocephala 
  atroviolacea 
  Crawford, 
  Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  vo!. 
  45. 
  p. 
  314, 
  

  

  1913. 
  

  

  Female. 
  — 
  Length 
  about 
  3 
  mm. 
  Black, 
  tinged 
  with 
  purple 
  on 
  

  

  head, 
  underside 
  of 
  thorax 
  and 
  abdomen 
  ; 
  thorax 
  above 
  faintly 
  

  

  tinged 
  with 
  green; 
  narrow 
  border 
  around 
  the 
  mouth, 
  mandibles, 
  

  

  