﻿NO. 
  1958. 
  NEW 
  SPECIES 
  OF 
  BORBORID/E—MALLOCH. 
  367 
  

   — 
  ^ 
  ^ 
  P 
  

  

  mesonotum 
  shining 
  black, 
  with 
  a 
  slight 
  olive 
  tinge, 
  the 
  dorsal 
  setulas 
  

   long, 
  tliree 
  pairs 
  noticeably 
  so, 
  yellowish, 
  pleursB 
  brownish, 
  glossy 
  

   on 
  lower 
  portions, 
  scutellum 
  with 
  four 
  marginal 
  bristles; 
  abdomen 
  

   subshining, 
  black, 
  with 
  pale 
  posterior 
  margins 
  to 
  segments, 
  basal 
  

   segment 
  as 
  long 
  as 
  next 
  two, 
  the 
  others 
  subequal 
  in 
  length, 
  lateral 
  

   and 
  posterior 
  marginal 
  hairs 
  sparse 
  but 
  strong, 
  the 
  latter 
  present 
  

   only 
  on 
  apical 
  segments; 
  male 
  hypopygium 
  large, 
  knob-like, 
  with 
  

   scattered 
  short 
  hairs, 
  and 
  several 
  long 
  bristles 
  at 
  apex 
  of 
  dorsal 
  plate, 
  

   the 
  ventral 
  surface 
  has 
  numerous 
  short 
  hairs 
  and 
  the 
  ventral 
  organs 
  

   are 
  much 
  paler 
  in 
  color 
  than 
  the 
  dorsal 
  plate; 
  legs 
  brown, 
  trochanters, 
  

   knees, 
  and 
  all 
  tarsi 
  yellow, 
  all 
  legs 
  with 
  numerous 
  long 
  hairs, 
  anterior 
  

   femora 
  strong, 
  a 
  series 
  of 
  long 
  bristles 
  on 
  apical 
  two- 
  thirds 
  of 
  ventral 
  

   surface, 
  mid 
  femora 
  and 
  tibiae 
  as 
  in 
  articus, 
  hind 
  femora 
  with 
  three 
  

   stronger 
  bristles 
  at 
  fi'om 
  middle 
  to 
  near 
  tip 
  on 
  dorsal 
  surface, 
  a 
  long 
  

   hak"-like 
  bristle 
  at 
  near 
  base 
  on 
  ventral 
  surface, 
  hind 
  tibiae 
  thickened, 
  

   shorter 
  than 
  femora, 
  with 
  long 
  hairs, 
  the 
  usual 
  long 
  dorsal 
  bristle 
  at 
  

   near 
  to 
  apex, 
  a 
  distinct 
  strong 
  bristle 
  and 
  some 
  long 
  hairs 
  at 
  about 
  

   apical 
  third 
  of 
  antero-ventral 
  surface, 
  a 
  series 
  of 
  about 
  seven 
  very 
  

   long, 
  fuie, 
  hair-like 
  bristles 
  on 
  posterior 
  surface 
  from 
  a 
  little 
  above 
  

   middle 
  to 
  tip 
  ; 
  those 
  long 
  hairs 
  are 
  absent 
  in 
  female 
  ; 
  apical 
  thorn-like 
  

   spur 
  long 
  and 
  strong, 
  basal 
  joint 
  of 
  hind 
  tarsi 
  dilated, 
  two-thirds 
  as 
  

   long 
  as 
  second 
  basal, 
  which 
  is 
  slightly 
  dilated; 
  wings 
  milk-white, 
  

   costal 
  vein 
  yellowish, 
  the 
  other 
  veins 
  colorless, 
  from 
  humeral 
  vein 
  to 
  

   end 
  of 
  first 
  vein 
  one-third 
  as 
  long 
  as 
  from 
  end 
  of 
  first 
  vein 
  to 
  end 
  of 
  

   second 
  m 
  male 
  and 
  barely 
  as 
  long 
  as 
  from 
  second 
  vein 
  to 
  third 
  vein; 
  

   in 
  female 
  the 
  first 
  mentioned 
  is 
  rather 
  more 
  than 
  one-third 
  the 
  

   second 
  and 
  slightly 
  longer 
  than 
  last-named 
  division; 
  inner 
  cross 
  

   vein 
  distinctly 
  beyond 
  end 
  of 
  first 
  vem 
  and 
  at 
  one-fourth 
  from 
  base 
  of 
  

   discal 
  cell; 
  fifth 
  vein 
  reaching 
  midway 
  to 
  wing 
  margin 
  beyond 
  outer 
  

   cross 
  vein; 
  sixth 
  vein 
  reaching 
  two-thirds 
  to 
  wing 
  margin; 
  halteres 
  

   whitish. 
  

  

  Length, 
  2 
  mm. 
  

  

  One 
  male 
  and 
  one 
  female, 
  Tampico, 
  Mexico 
  (E. 
  A. 
  Schwarz). 
  

  

  Easily 
  recognizable 
  from 
  any 
  other 
  described 
  species 
  by 
  the 
  white 
  

   wings, 
  the 
  short 
  arista, 
  and 
  the 
  long 
  hind 
  tibial 
  bail's 
  in 
  the 
  male. 
  

  

  TyiJe.—Csit. 
  No. 
  14949, 
  U.S.N.M. 
  

  

  BORBORUS 
  ARTICUS, 
  new 
  species. 
  

  

  Male 
  and 
  female. 
  — 
  Greenish 
  black, 
  distinctly 
  shiny 
  ; 
  frons 
  subshining 
  

   except 
  on 
  the 
  stripes 
  where 
  the 
  small 
  central 
  bristles 
  are 
  situated, 
  

   bristles 
  situated 
  as 
  in 
  hrevisetus, 
  a 
  rather 
  distinct 
  bristle 
  between 
  the 
  

   two 
  lower 
  lateral 
  bristles, 
  the 
  hair-like 
  bristles 
  on 
  central 
  divergent 
  

   stripes 
  numerous 
  and 
  long 
  though 
  fine, 
  frons 
  distinctly 
  projecting 
  in 
  

   front, 
  face 
  concave, 
  produced 
  at 
  mouth 
  margin, 
  distinctly 
  whitish 
  

  

  