﻿156 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.98 
  

  

  ARNOLDITA,* 
  new 
  genus 
  

  

  Thyreopus 
  (Tracheliodes) 
  [nee 
  Morawitz] 
  Arnold, 
  Ann. 
  Transvaal 
  Mus., 
  vol. 
  11, 
  

  

  p. 
  349, 
  1926. 
  

   Crabro 
  (species-group 
  Tracheliodes) 
  [nee 
  Morawitz] 
  Arnold, 
  Ann. 
  Transvaal 
  

  

  Mus., 
  vol. 
  20, 
  p. 
  137, 
  1940; 
  Occ. 
  Pap. 
  Nat. 
  Mus. 
  Southern 
  Rhodesia, 
  vol. 
  2, 
  

  

  No. 
  2, 
  p. 
  28. 
  1944. 
  

  

  Genotype. 
  — 
  Thyreopus 
  {Tracheliodes) 
  perarmatus 
  Arnold, 
  1026 
  

   {^Arnoldita 
  perarmata 
  (Arnold) 
  ). 
  

  

  The 
  three-segmented 
  labial 
  and 
  six-segmented 
  maxillary 
  palpi 
  dif- 
  

   ferentiate 
  Arnoldita 
  from 
  all 
  other 
  genera 
  of 
  pemphilidine 
  wasps 
  with 
  

   the 
  exception 
  of 
  Tracheliodes 
  and 
  Enoplolindenius. 
  From 
  both 
  of 
  

   these, 
  the 
  present 
  genus 
  ma}' 
  be 
  distinguished 
  by 
  its 
  slender, 
  elongate, 
  

   clavate 
  abdomen, 
  the 
  well-developed 
  sternauli 
  and 
  hypersternauli 
  on 
  

   the 
  mesopleura, 
  the 
  porrect 
  frontal 
  process, 
  and 
  the 
  11-segmented 
  an- 
  

   tennae 
  of 
  the 
  males. 
  In 
  addition, 
  the 
  transversely 
  carinate 
  pronotum, 
  

   the 
  vertical 
  carina 
  on 
  the 
  mesopleura 
  before 
  the 
  middle 
  coxae, 
  the 
  

   strongly 
  flanged 
  and 
  foveolate 
  occipital 
  carina, 
  and 
  the 
  carinate 
  an- 
  

   tennal 
  scapes 
  separate 
  Arnoldita 
  from 
  Tracheliodes; 
  while 
  the 
  

   rounded, 
  ecarinate 
  mesosternum, 
  the 
  incompletely 
  margined 
  scapal 
  

   sinus, 
  the 
  incomj^lete 
  occipital 
  carinule, 
  and 
  the 
  protean-shaped 
  man- 
  

   dibles 
  distinguish 
  the 
  present 
  genus 
  from 
  the 
  New 
  World 
  entity 
  

   Enoplolindenius. 
  

  

  Generic 
  characters. 
  — 
  Small, 
  slender, 
  fulgid, 
  impunctate 
  or 
  at 
  best 
  

   finely 
  punctate 
  forms. 
  Head 
  broad, 
  transversely 
  subrectangular 
  in 
  

   both 
  anterior 
  and 
  dopsal 
  aspects; 
  eyes 
  naked, 
  very 
  large 
  and 
  broad 
  

   below, 
  which 
  more 
  coarsely 
  faceted 
  anteriorly 
  than 
  posteriorly, 
  inner 
  

   orbits 
  either 
  strongly 
  convergent 
  below 
  or 
  more 
  or 
  less 
  arcuate 
  ; 
  malar 
  

   space 
  wanting. 
  Front 
  on 
  anterior 
  vertical 
  aspect 
  generally 
  narrow, 
  

   and 
  with 
  a 
  rather 
  deep, 
  incompletely 
  marginate 
  scapal 
  sinus 
  bisected 
  

   by 
  a 
  longitudinal 
  carinule 
  from 
  which 
  arises 
  just 
  above 
  antennal 
  

   sockets 
  one, 
  or 
  rarely 
  two, 
  large, 
  porrect, 
  protean-shaped 
  processes. 
  

   Vertex 
  flat, 
  nitidous, 
  generally 
  impunctate; 
  supraorbital 
  foveae 
  pres- 
  

   ent 
  and 
  generally 
  distinct; 
  ocelli 
  moderately 
  large, 
  arranged 
  in 
  an 
  

   equilateral 
  triangle. 
  Temples 
  very 
  well 
  developed, 
  ecarinate, 
  but 
  

   posterior 
  orbits 
  either 
  paralleled 
  or 
  not 
  by 
  a 
  marginate 
  groove; 
  

   occipital 
  carina 
  very 
  well 
  developed, 
  strongly 
  flanged, 
  foveolate 
  an- 
  

   teriorly, 
  but 
  neither 
  a 
  complete 
  circle 
  in 
  extent 
  nor 
  attaining 
  the 
  hy- 
  

   l>ostomal 
  carinule 
  bordering 
  the 
  broad, 
  shallow, 
  scyphate 
  oral 
  fossa. 
  

   Antennae 
  situated 
  low 
  on 
  face 
  on 
  dorsal 
  margin 
  of 
  clypeus, 
  the 
  sockets 
  

   contiguous 
  to 
  each 
  other 
  and 
  either 
  contiguous 
  to, 
  or 
  well 
  separated 
  

   from, 
  the 
  nearest 
  lower 
  inner 
  orbits 
  ; 
  12-segmented 
  in 
  the 
  females, 
  and 
  

   with 
  only 
  eleven 
  apparent 
  segments 
  in 
  the 
  known 
  males 
  ; 
  scape 
  slender, 
  

  

  * 
  It 
  gives 
  me 
  great 
  pleasure 
  to 
  dedicate 
  this 
  distinctive 
  genus 
  to 
  Dr. 
  George 
  Arnold, 
  

   director 
  of 
  the 
  National 
  Museum 
  of 
  Southern 
  Rhodesia, 
  in 
  recognition 
  of 
  his 
  outstanding 
  

   worlf 
  on 
  the 
  aculeate 
  Hynienoptera 
  of 
  Africa. 
  

  

  