﻿298 
  Mr. 
  R. 
  C. 
  L. 
  Perkins 
  on 
  

  

  34. 
  (41) 
  Mesonotum 
  clothed 
  with 
  fulvous 
  or 
  bright 
  brown 
  hairs 
  

  

  and 
  without 
  black 
  ones. 
  

  

  35. 
  (36) 
  Face 
  with 
  black 
  or 
  sooty 
  hairs; 
  hind 
  coxae 
  and 
  at 
  least 
  

  

  the 
  basal 
  part 
  of 
  the 
  trochanters 
  beneath 
  with 
  dark 
  

   hairs 
  nigriceps. 
  

  

  36. 
  (35) 
  Face 
  with 
  much 
  pale 
  hair 
  ; 
  that 
  on 
  the 
  hind 
  coxae 
  beneath 
  

  

  and 
  the 
  trochanters 
  pale. 
  

  

  37. 
  (40) 
  Appressed 
  hairs 
  of 
  5th 
  abdominal 
  segment 
  black 
  or 
  fuscous, 
  

  

  not 
  nearly 
  concolorous 
  with 
  the 
  apical 
  pubescent 
  band 
  

   of 
  the 
  4th 
  segment. 
  

  

  38. 
  (39) 
  Under 
  a 
  strong 
  lens 
  the 
  3rd 
  abdominal 
  segment 
  has 
  a 
  

  

  shallow 
  but 
  dense 
  and 
  distinct 
  (often 
  granulate) 
  punc- 
  

   turation 
  on 
  most 
  of 
  its 
  surface; 
  floccus 
  notably 
  imper- 
  

   fect, 
  many 
  thick 
  stiff 
  white 
  hairs 
  on 
  the 
  basal 
  part 
  of 
  

   the 
  trochanter 
  beneath 
  simillima. 
  

  

  39. 
  (38) 
  Under 
  a 
  strong 
  lens 
  the 
  3rd 
  abdominal 
  segment 
  has 
  a 
  very 
  

  

  feeble 
  puncturation 
  often 
  appearing 
  merely 
  as 
  minute 
  

   granules, 
  its 
  apical 
  hair-band 
  entirely 
  appressed 
  (not 
  

   formed 
  partly 
  of 
  subdecumbent 
  or 
  suberect 
  ones 
  as 
  in 
  

   the 
  preceding 
  species); 
  floccus 
  pale 
  ochreous, 
  very 
  dense 
  

   and 
  all 
  but 
  perfect 
  fuscipes. 
  

  

  40. 
  (37) 
  Appressed 
  hairs 
  of 
  5th 
  abdominal 
  segment 
  quite 
  pale 
  and 
  

  

  concolorous 
  (or 
  almost 
  so) 
  with 
  the 
  preceding 
  hair-band 
  ; 
  

   scopae 
  pale 
  brownish, 
  or 
  yellow. 
  . 
  . 
  . 
  tridentata. 
  

  

  41. 
  (34) 
  Mesonotum 
  and 
  often 
  the 
  scutellum 
  clothed 
  to 
  a 
  consider- 
  

  

  able 
  extent 
  with 
  black 
  hairs 
  denticulata. 
  

  

  42. 
  (33)* 
  Hind 
  tibiae 
  not 
  abnormal 
  as 
  described 
  under 
  33; 
  many 
  

  

  of 
  the 
  species 
  are 
  without 
  wide 
  and 
  distinct 
  hair-bands. 
  

  

  43. 
  (44) 
  Basal 
  abdominal 
  segment 
  strongly 
  and 
  densely 
  punctured, 
  

  

  shining 
  between 
  the 
  punctures, 
  and 
  with 
  a 
  clothing 
  of 
  

   long 
  thin 
  pubescence; 
  2nd, 
  3rd, 
  and 
  4th 
  segments 
  with 
  

   dense 
  pale 
  narrow 
  streaks 
  on 
  the 
  apical 
  margins, 
  forming 
  

  

  a 
  conspicuous 
  pattern 
  lahialis. 
  

  

  (A 
  large 
  species 
  with 
  smoky 
  wings, 
  hind 
  tibiae 
  dark 
  scopal 
  

   fringe 
  above 
  them 
  yellow 
  or 
  sometimes 
  nearly 
  white; 
  

   appressed 
  hairs 
  of 
  5th 
  abdominal 
  segment 
  fuscous 
  or 
  

   sordid, 
  often 
  with 
  underlying 
  paler 
  hairs.) 
  

  

  44. 
  (43) 
  Species 
  without 
  the 
  above 
  combination 
  of 
  characters. 
  

  

  45. 
  (46) 
  Appressed 
  hairs 
  of 
  5th 
  abdominal 
  segment 
  quite 
  pale, 
  

  

  yellow 
  or 
  golden, 
  without 
  admixture 
  of 
  dark 
  fuscous 
  or 
  

   sordid 
  hairs. 
  

  

  * 
  Perhaps 
  the 
  nearest 
  approach 
  to 
  the 
  nigriceps 
  group 
  in 
  this 
  

   respect 
  is 
  to 
  be 
  found 
  in 
  A. 
  praecox. 
  

  

  