﻿NO. 
  1958. 
  NEW 
  SPECIES 
  OF 
  BORBORIDJE—MALLOCH. 
  365 
  

  

  thickly 
  haii-ed, 
  from 
  base 
  of 
  wing 
  to 
  humeral 
  vein 
  two-fifths 
  the 
  length 
  

   of 
  second 
  division 
  of 
  costa, 
  second 
  division 
  less 
  than 
  one-thu'd 
  the 
  

   length 
  of 
  third 
  and 
  equal 
  to 
  fourth, 
  small 
  cross 
  vein 
  at 
  distinctly 
  

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

   discal 
  cell, 
  basal 
  portion 
  of 
  third 
  vein 
  longer 
  than 
  second 
  portion 
  of 
  

   fourth, 
  fifth 
  vein 
  not 
  contmued 
  beyond 
  outer 
  cross 
  vein, 
  the 
  angle 
  of 
  

   bend 
  distinctly 
  rounded, 
  sixth 
  vein 
  veiy 
  distinct 
  to 
  about 
  midway 
  

   from 
  cross 
  vein 
  to 
  wing 
  margin, 
  halteres 
  reddish 
  yellow. 
  

  

  Length, 
  3^ 
  mm. 
  

  

  One 
  specimen 
  (female), 
  labeled 
  ''Borborus," 
  from 
  Beverly, 
  Massa- 
  

   chusetts, 
  April 
  4, 
  1867 
  (collection 
  of 
  C. 
  V. 
  Riley). 
  Nearest 
  to 
  nigri- 
  

   femoratus 
  Macquart, 
  but 
  quite 
  distinct. 
  

  

  Type.— 
  Cat. 
  No. 
  14947, 
  U.S.N 
  M. 
  

  

  BORBORUS 
  BREVISETUS, 
  new 
  species. 
  

  

  Male 
  and 
  female. 
  — 
  ^Opaque 
  brown-gray; 
  frons 
  with 
  center 
  and 
  

   lateral 
  margins 
  gray, 
  the 
  two 
  stripes, 
  where 
  central 
  rows 
  of 
  bristles 
  

   are 
  situated, 
  opaque 
  black, 
  in 
  male 
  nearly 
  entire 
  center 
  of 
  frons 
  

   darkened, 
  the 
  usual 
  tliree 
  lateral 
  frontal 
  bristles 
  increasing 
  in 
  size 
  

   toward 
  vertex, 
  and 
  nearly 
  equidistant, 
  the 
  third 
  one 
  incurved, 
  the 
  

   lower 
  slightly 
  outwardly 
  directed 
  over 
  eye, 
  vertical 
  bristles 
  strong, 
  

   ocellar 
  bristles 
  strongly 
  divergent, 
  one 
  or 
  two 
  hairs 
  between 
  lower 
  

   pair 
  of 
  bristles, 
  and 
  a 
  number 
  on 
  lateral 
  margins 
  of 
  frons 
  below 
  the 
  

   lowest 
  bristle, 
  central 
  bristles 
  distinct, 
  strongly 
  incurved, 
  and 
  reach- 
  

   ing 
  more 
  than 
  halfway 
  to 
  ocellar 
  triangle, 
  face 
  gray, 
  labrum 
  only 
  

   slightly 
  produced, 
  gray 
  pollinose, 
  the 
  strong 
  incurved 
  long 
  bristle 
  

   midway 
  between 
  mouth 
  margin 
  and 
  eye 
  and 
  a 
  weaker 
  one 
  slightly 
  

   posterior 
  to 
  and 
  much 
  lower 
  than 
  it, 
  as 
  well 
  as 
  several 
  weak 
  hair-like 
  

   bristles 
  posteriori}^ 
  on 
  the 
  cheeks, 
  lower 
  occiput 
  and 
  eye-margin 
  to 
  

   near 
  strong 
  bristles 
  shining, 
  basal 
  joint 
  of 
  antennae 
  with 
  one 
  long 
  

   and 
  several 
  short 
  hairs, 
  third 
  joint 
  black, 
  slightly 
  gray 
  pollinose 
  at 
  

   tip, 
  at 
  least 
  twice 
  as 
  large 
  as 
  first, 
  arista 
  very 
  short, 
  barely 
  two- 
  

   thirds 
  as 
  long 
  as 
  breadth 
  of 
  frons 
  at 
  center, 
  distinctly 
  tapering 
  and 
  

   very 
  slightly 
  pubescent; 
  thorax 
  gray 
  brown, 
  with 
  four 
  regular 
  rows 
  

   of 
  serial 
  setulee 
  on 
  the 
  dorsum, 
  and 
  two 
  rather 
  irregular 
  rows 
  external 
  

   to 
  them 
  on 
  the 
  lateral 
  margins, 
  two 
  strong 
  dorso-central 
  macro- 
  

   chsetse, 
  the 
  center 
  of 
  thorax 
  with 
  a 
  distinct 
  brown 
  stripe 
  covering 
  

   the 
  insertions 
  of 
  the 
  center 
  pair 
  of 
  rows 
  of 
  setulse, 
  a 
  narrower 
  stripe 
  

   along 
  the 
  line 
  of 
  the 
  other 
  pair 
  of 
  rows, 
  a 
  transverse 
  brown 
  mark 
  

   behind 
  the 
  humeri 
  and 
  another 
  in 
  front 
  of 
  the 
  wing 
  base, 
  as 
  well 
  as 
  

   an 
  interrupted 
  brown 
  longitudinal 
  stripe 
  from 
  behind 
  middle 
  of 
  dor- 
  

   sum 
  to 
  scutellum, 
  scutellum 
  dark 
  on 
  disk 
  and 
  pale 
  on 
  margin, 
  with 
  

   four 
  equal-sized 
  marginal 
  bristles, 
  lower 
  two-thirds 
  of 
  sternopleuraB 
  

   glossy 
  black; 
  abdomen 
  opaque 
  gray-brown, 
  the 
  basal 
  segment 
  slightly 
  

   the 
  longest, 
  with 
  numerous 
  lateral 
  hairs, 
  terminal 
  segment 
  with 
  

  

  