﻿202 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  »8 
  

  

  mesonotum 
  to 
  apex 
  of 
  scutellar 
  process, 
  brownish 
  to 
  blackish; 
  this 
  

   stripe 
  evident 
  on 
  prescutum 
  (where 
  the 
  pattern 
  varies), 
  just 
  before 
  

   scutellum, 
  and 
  on 
  scutellum, 
  at 
  least 
  on 
  its 
  apical 
  process; 
  scutellum 
  

   sometimes 
  blackish 
  laterally. 
  Thorax 
  slightly 
  though 
  noticeably 
  

   swollen 
  in 
  supraalar 
  region 
  and 
  subalar 
  regions 
  of 
  mesopleura, 
  

   sternopleura, 
  and 
  pteropleura. 
  Scutellar 
  process 
  equal 
  in 
  length 
  to 
  

   basal 
  part 
  of 
  scutellum; 
  sides 
  of 
  scutellum, 
  including 
  process, 
  with 
  

   numerous 
  small 
  setif 
  erous 
  denticles. 
  

  

  Legs 
  slender 
  ; 
  tarsi 
  flattened 
  ; 
  each 
  basitarsus 
  longer 
  than 
  remaining 
  

   segments 
  combined. 
  Fore 
  tarsus 
  and 
  hind 
  tibia 
  blackish; 
  fore 
  tibia 
  

   brownish; 
  hind 
  tarsus 
  yellow 
  to 
  brownish; 
  legs 
  otherwise 
  reddish 
  

   yellow. 
  Wing 
  chiefly 
  hyaline, 
  the 
  stigma, 
  the 
  apex 
  involving 
  chiefly 
  

   cell 
  R4, 
  and 
  the 
  narrow 
  costal 
  margin 
  between 
  these 
  areas 
  infuscated 
  ; 
  

   vein 
  R2+8 
  arising 
  slightly 
  before 
  to 
  slightly 
  beyond 
  cross-vein 
  r-m. 
  

   Halteres 
  yellow. 
  

  

  Abdomen 
  ovate, 
  length 
  about 
  1.25 
  maximum 
  width 
  ; 
  reddish 
  yellow. 
  

   Genitalia 
  small, 
  reddish 
  yellow. 
  Length, 
  3.5 
  to 
  5 
  mm. 
  

  

  Holotype. 
  — 
  Male, 
  Teneru 
  District, 
  Guadalcanal 
  Island, 
  October 
  14, 
  

   1944 
  (Beck), 
  U.S.N.M. 
  No. 
  58471. 
  

  

  Paratype. 
  — 
  Male, 
  Umasami 
  River 
  Valley, 
  Guadalcanal 
  Island, 
  

   October 
  2, 
  1944 
  (Laffoon). 
  

  

  Remarks. 
  — 
  MonacanthoTnyia 
  annandalei 
  Brunetti, 
  the 
  genotype, 
  is 
  

   the 
  only 
  previously 
  described 
  species 
  positively 
  referred 
  to 
  this 
  genus. 
  

   According 
  to 
  Brunetti 
  and 
  Kertesz, 
  ProstoTYiomyia 
  atronitens 
  Kertesz 
  

   and 
  Ceratothyrea 
  nigrifemiu/r 
  de 
  Meijere 
  probably 
  also 
  belong 
  here. 
  

   The 
  yellow 
  body 
  and 
  the 
  coloration 
  of 
  the 
  legs 
  will 
  readily 
  distinguish 
  

   hecki 
  from 
  these 
  three 
  species. 
  

  

  Genus 
  PTILOCERA 
  Wiedemann 
  

  

  Ptilocera 
  Wiedemann, 
  Nova 
  dipterorum 
  genera, 
  p. 
  7, 
  1820. 
  

  

  An 
  interesting 
  integumentary 
  character 
  of 
  this 
  genus 
  is 
  the 
  posses- 
  

   sion 
  of 
  dense, 
  microscopic, 
  setigerous 
  plates, 
  each 
  isolated 
  from 
  the 
  

   others 
  and, 
  as 
  a 
  rule, 
  round 
  in 
  outline. 
  The 
  setulae 
  borne 
  by 
  these 
  

   plates 
  may 
  be 
  simple 
  inconspicuous 
  hairs; 
  they 
  msiy 
  be 
  somewhat 
  

   flattened, 
  appressed, 
  and 
  as 
  a 
  rule 
  whitish, 
  thus 
  forming, 
  in 
  their 
  

   aggregations, 
  tomentose 
  patches 
  ; 
  or 
  they 
  may 
  be 
  still 
  further 
  flattened 
  

   and 
  broadened, 
  in 
  the 
  form 
  of 
  iridescent 
  scales. 
  The 
  integument 
  

   has 
  been 
  erroneously 
  described 
  as 
  punctured. 
  True 
  setigerous 
  punc- 
  

   tures 
  do, 
  however, 
  occur 
  on 
  the 
  head. 
  

  

  PTILCOCERA 
  BERGI, 
  new 
  species 
  

  

  Female. 
  — 
  Head 
  black. 
  Front 
  at 
  narrowest 
  point 
  about 
  0.22 
  head 
  

   width; 
  its 
  upper 
  half, 
  including 
  vertex 
  and 
  ©cellar 
  triangle, 
  with 
  

   numerous 
  piliferous 
  punctures 
  of 
  irregular 
  density 
  and 
  interrupted 
  

  

  