﻿364 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  well 
  as 
  the 
  fact 
  that 
  the 
  thu\l 
  and 
  fourth 
  vieiis 
  do 
  not 
  diverge 
  at 
  apex. 
  

   From 
  subsultans 
  Fabricius, 
  by 
  the 
  absence 
  of 
  the 
  strong 
  thornlike 
  

   apical 
  spur 
  on 
  hind 
  tibise, 
  and 
  from 
  himaculata 
  Williston, 
  by 
  the 
  

   unicolorous 
  abdomen 
  and 
  the 
  convergent 
  instead 
  of 
  parallel 
  third 
  and 
  

   fourth 
  veins. 
  

  

  BORBORUS 
  NEGLECTUS, 
  new 
  species. 
  

  

  Female. 
  — 
  Shining 
  black; 
  frons 
  shining 
  black 
  except 
  in 
  front, 
  where 
  

   it 
  is 
  j^cllow 
  margined, 
  and 
  the 
  two 
  lateral 
  extremities 
  of 
  the 
  pale 
  por- 
  

   tion 
  which 
  are 
  carried 
  posteriorly 
  to 
  ocellar 
  triangle; 
  central 
  rows 
  of 
  

   bristles 
  weak, 
  divergent 
  posteriorly 
  and 
  incurved; 
  three 
  strong 
  lateral 
  

   frontal 
  bristles, 
  the 
  lowest 
  slightly 
  below, 
  the 
  second 
  slightly 
  above 
  

   center 
  of 
  frons, 
  a 
  single 
  weak 
  hair 
  between 
  the 
  lower 
  pair; 
  besides 
  the 
  

   usual 
  two 
  rows 
  of 
  central 
  bristles, 
  which 
  stop 
  much 
  short 
  of 
  the 
  ocellar 
  

   triangle, 
  there 
  are 
  on 
  the 
  pale 
  stripes 
  a 
  number 
  of 
  weaker 
  hairs; 
  

   ocellar 
  bristles 
  strong, 
  divergent; 
  basal 
  joint 
  of 
  antennae 
  black, 
  with 
  

   4-5 
  long 
  hair-like 
  bristles; 
  third 
  joint 
  brownish-yellow, 
  twice 
  as 
  long 
  

   as 
  first, 
  strongly 
  but 
  shortly 
  pubescent; 
  arista 
  pale, 
  pubescent, 
  one 
  

   and 
  two-thirds 
  times 
  as 
  long 
  as 
  breadth 
  of 
  frons; 
  face 
  yellowish 
  above, 
  

   browni 
  below, 
  shining; 
  labrum 
  much 
  produced, 
  brown, 
  shining; 
  occiput 
  

   and 
  cheeks 
  shining, 
  especially 
  glossy 
  beneath 
  eyes, 
  one 
  very 
  long 
  

   bristle 
  on 
  mouth 
  edge, 
  and 
  one 
  moderately 
  long, 
  and 
  numerous 
  bristle- 
  

   like 
  hairs 
  posterior 
  to 
  it; 
  thorax 
  shining, 
  unstriped; 
  pleurae 
  glossy 
  

   black; 
  scutellum 
  with 
  four 
  marginal 
  bristles, 
  the 
  anterior 
  pair 
  weak; 
  

   abdomen 
  glossy 
  black, 
  extremely 
  broad 
  and 
  short, 
  nearly 
  cu'cular 
  in 
  

   dorsal 
  outline; 
  basal 
  segment 
  very 
  long, 
  with 
  raised 
  longitudinal 
  

   central, 
  and 
  hind-margmal 
  transverse 
  ridge 
  ; 
  numerous 
  lateral 
  hairs 
  

   present 
  on 
  basal 
  half 
  of 
  segment, 
  second 
  segment 
  slightly 
  shorter 
  than 
  

   first, 
  narrowed 
  behind, 
  numerous 
  lateral 
  hau-s, 
  a 
  slight 
  longitudinal 
  

   central, 
  and 
  distinct 
  transverse 
  hmd-marginal 
  ridge; 
  thu'd 
  segment 
  

   short, 
  not 
  half 
  as 
  long 
  as 
  second, 
  with 
  lateral 
  hairs; 
  fourth 
  segment 
  

   pale 
  yellowish- 
  brown, 
  shorter 
  than 
  thii'd 
  and 
  much 
  narrower, 
  with 
  

   numerous 
  hairs; 
  anal 
  organ 
  tawny, 
  with 
  longish 
  hairs; 
  venter 
  tawny; 
  

   legs 
  yellow, 
  except 
  the 
  bases 
  of 
  coxae 
  broadly 
  and 
  the 
  femora 
  except 
  

   extreme 
  bases 
  and 
  tips 
  which 
  are 
  glossj^ 
  black; 
  apices 
  of 
  tibiae 
  and 
  

   tarsi 
  slightly 
  browned; 
  all 
  legs 
  with 
  distinct, 
  rather 
  long 
  hairs; 
  fore 
  

   femora 
  with 
  three 
  or 
  four 
  distinct 
  bristles 
  on 
  postero-dorsal 
  surface; 
  

   mid 
  femora 
  with 
  a 
  few 
  rather 
  stronger 
  hair^like 
  bristles 
  on 
  the 
  antero- 
  

   ventral 
  surface; 
  mid 
  tibial 
  hairs 
  strong, 
  two 
  bristles 
  on 
  the 
  dorsal 
  

   surfaces 
  at 
  near 
  tip 
  besides 
  the 
  apical 
  spines; 
  hind 
  femora 
  very 
  long 
  

   and 
  slim, 
  distinctly 
  bent, 
  \N\i\\ 
  strong 
  hairs 
  that 
  are 
  almost 
  bristles 
  on 
  

   the 
  antero-dorsal 
  surface; 
  tibiaa 
  shorter 
  than 
  femora, 
  wdth 
  a 
  distinct 
  

   long 
  bristle 
  at 
  near 
  tip 
  of 
  dorsal 
  surface; 
  apical 
  spur 
  black, 
  long, 
  and 
  

   curved; 
  basal 
  johit 
  of 
  tarsi 
  distinctly 
  broader 
  than 
  tibiae, 
  elongated 
  on 
  

   posterior 
  external 
  angle, 
  second 
  joint 
  one-fourth 
  longer 
  and 
  much 
  

   thiimer 
  than 
  basal 
  joint; 
  wings 
  brownish, 
  veins 
  dark 
  brown, 
  costa 
  

  

  