﻿306 
  Mr. 
  R. 
  C. 
  L. 
  Perkins 
  on 
  

  

  with 
  more 
  decumbent 
  hairs; 
  flagellmn 
  of 
  antemiae 
  

   fulvous, 
  its 
  second 
  joint 
  with 
  a 
  black 
  stripe 
  behind.) 
  

  

  8. 
  (7) 
  If 
  the 
  lab 
  rum 
  is 
  black 
  the 
  species 
  are 
  small 
  or 
  medium 
  -sized, 
  

  

  7'5 
  mm. 
  or 
  less. 
  

  

  9. 
  (12) 
  Scape 
  black 
  in 
  front 
  (as 
  well 
  as 
  behind) 
  the 
  3rd 
  antennal 
  

  

  joint 
  beneath 
  as 
  long 
  or 
  longer 
  than 
  the 
  5th. 
  

  

  10. 
  (11) 
  Labrum 
  pale 
  (yeUow 
  or 
  dull 
  red) 
  the 
  hind 
  femora 
  beneath 
  

  

  very 
  densely 
  finely 
  punctured 
  and 
  clothed 
  with 
  dense 
  

  

  short 
  hairs 
  guttulata. 
  

  

  (Yellow 
  spots 
  of 
  2nd 
  and 
  3rd 
  abdominal 
  segments 
  small 
  

   and 
  lateral, 
  sometimes 
  each 
  of 
  them 
  divided 
  into 
  two; 
  

   front 
  and 
  middle 
  femora 
  beneath 
  with 
  well-developed 
  

   moderately 
  long 
  fringe.) 
  

  

  11. 
  (10) 
  Labrimi 
  wholly 
  or 
  partly 
  black, 
  the 
  hind 
  femora 
  beneath 
  

  

  polished, 
  almost 
  bare, 
  and 
  very 
  sparsely 
  punctured. 
  

  

  obtusifrons. 
  

   (A 
  small 
  species 
  7*5 
  mm. 
  or 
  less, 
  the 
  3rd 
  antennal 
  joint 
  

   beneath 
  slightly 
  but 
  distinctly 
  longer 
  than 
  the 
  4th 
  

   or 
  6th, 
  which 
  are 
  hardly 
  longer 
  than 
  broad; 
  face 
  not 
  

   compressed 
  into 
  a 
  sharp 
  carina 
  between 
  the 
  antennae, 
  

   but 
  sometimes 
  with 
  a 
  raised 
  median 
  line 
  there; 
  middle 
  

   femora 
  with 
  a 
  distinct 
  hair 
  fringe 
  beneath; 
  labrum 
  

   sometimes 
  pale 
  on 
  the 
  basal 
  half.) 
  

  

  12. 
  (9) 
  Scape 
  in 
  most 
  species 
  more 
  or 
  less 
  pale 
  in 
  front; 
  if 
  black 
  

  

  the 
  3rd 
  antennal 
  joint 
  on 
  its 
  lower 
  side 
  is 
  shorter 
  than 
  

   the 
  5th. 
  

  

  13. 
  (14) 
  Scutellum 
  with 
  a 
  single 
  bright 
  yellow 
  marking; 
  2nd 
  abdo- 
  

  

  minal 
  segment 
  with 
  well-separated 
  yellow 
  spots, 
  which 
  

  

  do 
  not 
  form 
  a 
  band 
  rufipes. 
  

  

  (Front 
  femora 
  with 
  a 
  thin 
  fringe 
  beneath, 
  that 
  on 
  the 
  

   middle 
  ones 
  hardly 
  noticeable, 
  hind 
  ones 
  much 
  as 
  in 
  

   obtusifrons. 
  ) 
  

  

  14. 
  (13) 
  Scutellum 
  with 
  a 
  single 
  bright 
  yellow 
  spot 
  only 
  in 
  one 
  

  

  species, 
  which 
  has 
  an 
  entire 
  (or 
  almost 
  entire) 
  yellow 
  

   band 
  on 
  the 
  2nd 
  segment 
  of 
  the 
  abdomen. 
  

  

  15. 
  (16) 
  A 
  single 
  (or 
  indistinctly 
  divided) 
  red 
  or 
  orange-red 
  spot 
  on 
  

  

  the 
  scuteUum; 
  3rd 
  antennal 
  joint 
  beneath 
  subequal 
  to 
  

  

  the 
  4th 
  tormentillae. 
  

  

  (Scape 
  of 
  antermae 
  yellow 
  in 
  front 
  ; 
  propodeum 
  only 
  with 
  

   short 
  inconspicuous 
  hairs 
  on 
  each 
  side; 
  middle 
  and 
  

   hind 
  femora 
  without 
  a 
  fringe 
  beneath; 
  spots 
  of 
  2nd 
  

   abdominal 
  segment 
  separated 
  by 
  a 
  distance 
  about 
  

   equal 
  to 
  the 
  length 
  of 
  one 
  of 
  these 
  or 
  by 
  a 
  greater 
  

   distance.) 
  

  

  