﻿366 
  PROCBEDINGS 
  OF 
  THE 
  ^\VnO^'AL 
  MUSEUM. 
  vol.44. 
  

  

  strong 
  apical 
  hairs, 
  male 
  hypopygiiim 
  large, 
  slightly 
  shining 
  and 
  

   distinctly 
  ])rotruding, 
  cleft 
  on 
  left 
  side, 
  with 
  numerous 
  long 
  hairs 
  on 
  

   disk, 
  anal 
  organ 
  in 
  female 
  densely 
  covered 
  with 
  hairs; 
  legs 
  entirely 
  

   gray-black, 
  thickly 
  covered 
  with 
  rather 
  long 
  hairs, 
  fore 
  femora 
  thick- 
  

   enetl, 
  the 
  hairs 
  on 
  them 
  more 
  bristle-like, 
  mid 
  femora 
  with 
  a 
  series 
  

   of 
  short 
  bristles 
  on 
  antero-dorsal 
  surface, 
  and 
  one 
  strong 
  one 
  at 
  one- 
  

   fourth 
  from 
  tip, 
  succeeded 
  by 
  a 
  smaller 
  one 
  nearer 
  to 
  tip 
  as 
  well 
  as 
  

   the 
  numerous 
  hairs, 
  mid 
  tibia3 
  with 
  a 
  short, 
  but 
  distinct 
  bristle 
  at 
  

   middle 
  on 
  antero-ventral 
  surface, 
  one 
  on 
  postero-dorsal 
  surface 
  at 
  

   same 
  place 
  and 
  tlii-ee 
  pre-apical 
  bristles, 
  one 
  dorsal, 
  one 
  antero- 
  and 
  

   one 
  postero-dorsal 
  as 
  well 
  as 
  two 
  weak 
  apical 
  spurs, 
  hind 
  femora 
  

   nearly 
  straight, 
  distinctly 
  thicker 
  than 
  tibiae, 
  tibiae 
  with 
  one 
  bristle 
  

   at 
  about 
  one-third 
  from 
  apex 
  on 
  antero-ventral 
  surface, 
  and 
  one 
  long 
  

   pre-apical 
  dorsal 
  bristle, 
  the 
  end 
  spur 
  very 
  long 
  and 
  sharp, 
  basal 
  

   hind 
  tarsal 
  joint 
  as 
  broad 
  as 
  tibiae 
  and 
  two-thirds 
  as 
  long 
  as 
  the 
  nar- 
  

   row 
  second 
  joint, 
  the 
  pubescence 
  on 
  ventral 
  surface 
  yellow 
  in 
  some 
  

   lights; 
  wings 
  slightly 
  grayish, 
  veins 
  brown, 
  first 
  costal 
  division 
  

   shorter 
  than 
  second 
  in 
  male, 
  shorter 
  than 
  fourth 
  and 
  about 
  one- 
  

   fourth 
  as 
  long 
  as 
  third, 
  second 
  in 
  female 
  as 
  long 
  as 
  fourth, 
  inner 
  cross 
  

   veui 
  slightly 
  beyond 
  end 
  of 
  first 
  vein 
  and 
  less 
  than 
  one-third 
  from 
  

   base 
  of 
  discal 
  cell, 
  basal 
  portion 
  of 
  third 
  vein 
  slightly 
  longer 
  than 
  

   second 
  portion 
  of 
  fourth, 
  fifth 
  vein 
  distinct 
  to 
  halfway 
  from 
  outer 
  

   cross 
  vein 
  to 
  wing 
  margin, 
  sixth 
  very 
  distinct 
  to 
  more 
  than 
  midway 
  

   to 
  margin, 
  halteres 
  yellow. 
  

  

  Length, 
  2 
  mm. 
  

  

  One 
  male, 
  Washington, 
  District 
  of 
  Columbia, 
  April 
  28, 
  1912, 
  on 
  

   United 
  States 
  National 
  Museum 
  window 
  (Malloch) 
  ; 
  one 
  female. 
  Las 
  

   Vegas, 
  New 
  Mexico 
  (Cockerell), 
  4,000 
  feet, 
  June, 
  1901. 
  

  

  Type.— 
  Osit. 
  No. 
  14948, 
  U.S.N.M. 
  

  

  BORBORUS 
  LACTEIPENNIS, 
  new 
  species. 
  

  

  Male 
  and 
  female. 
  — 
  Black, 
  shining; 
  head 
  buccate, 
  the 
  frons 
  descend- 
  

   ing 
  in 
  front 
  and 
  very 
  distinctly 
  produced 
  above 
  antennse, 
  eyes 
  small, 
  

   at 
  center 
  barely 
  higher 
  than 
  fi-om 
  lower 
  margin 
  to 
  mouth 
  margin 
  

   across 
  cheek, 
  frons 
  distinctly 
  longer 
  than 
  broad 
  at 
  center, 
  opaque 
  

   black-brown, 
  with 
  the 
  anterior 
  margin 
  and 
  the 
  central 
  divergent 
  

   stripes 
  reddish, 
  bristles 
  rather 
  hair-like, 
  those 
  on 
  anterior 
  margin 
  and 
  

   divergent 
  stripes 
  very 
  numerous, 
  long, 
  and 
  pale 
  in 
  color, 
  basal 
  joint 
  

   of 
  antennae 
  hidden 
  under 
  frons, 
  third 
  joint 
  rounded, 
  twice 
  as 
  long 
  as 
  

   basal 
  jomt, 
  brown 
  at 
  tip, 
  yellowish 
  at 
  base, 
  one 
  strong 
  and 
  several 
  

   weak 
  hairs 
  on 
  the 
  upper 
  surface 
  of 
  basal 
  joint, 
  arista 
  as 
  long 
  as 
  

   breadth 
  of 
  frons 
  at 
  center, 
  pubescent, 
  face 
  yellow, 
  produced 
  at 
  mouth 
  

   margin, 
  labrum 
  slightly 
  projecting, 
  cheeks 
  yellow, 
  browned 
  poste- 
  

   riorly, 
  becoming 
  merged 
  into 
  black 
  toward 
  occiput; 
  the 
  anterior 
  

   bristle 
  above 
  mouth 
  margin 
  strong, 
  those 
  posterior 
  to 
  it 
  very 
  weak; 
  

  

  