﻿538 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  103 
  

  

  I 
  have 
  in 
  my 
  collection 
  two 
  males 
  (paratypes) 
  of 
  D. 
  bruneri, 
  from 
  

   Aeronautes 
  s. 
  saxatilis, 
  and 
  they 
  certainly 
  are 
  not 
  what 
  Ewing 
  describes 
  

   as 
  dubius 
  (see 
  key). 
  Although 
  the 
  two 
  are 
  undoubtedly 
  closely 
  

   related, 
  and 
  may 
  possibly 
  be 
  conspecific 
  along 
  with 
  the 
  new 
  

   species 
  (limbus) 
  described 
  on 
  page 
  542, 
  until 
  more 
  is 
  known 
  about 
  

   this 
  group 
  I 
  prefer 
  to 
  leave 
  them 
  as 
  separate 
  species. 
  

  

  Dennyus 
  bruneri 
  (Carriker) 
  

  

  Figure 
  63,c 
  

  

  Nitzschia 
  pulicaris 
  var. 
  tibialis 
  Carriker, 
  Journ. 
  New 
  York 
  Ent. 
  Soc, 
  vol. 
  10, 
  

   p. 
  225, 
  pi. 
  22, 
  figs. 
  4, 
  5, 
  1902. 
  (Host, 
  Aeronautes 
  melanoleucus 
  {=A. 
  s. 
  saxatilis 
  

   (Woodhouse) 
  .) 
  

  

  Nitzschia 
  bruneri 
  Carriker, 
  Univ. 
  Nebraska 
  Stud., 
  vol. 
  3, 
  No. 
  2, 
  p. 
  55, 
  1903 
  

   (new 
  name 
  for 
  N. 
  tibialis, 
  preoccupied 
  by 
  N. 
  tibialis 
  Piaget, 
  1880). 
  

  

  I 
  have 
  in 
  my 
  collection 
  two 
  males 
  (labeled 
  as 
  types) 
  of 
  this 
  species. 
  

   The 
  original 
  type 
  series 
  contained 
  three 
  males 
  and 
  one 
  female. 
  I 
  

   imagine 
  that 
  one 
  male 
  and 
  the 
  female 
  remained 
  in 
  the 
  collection 
  of 
  

   the 
  University 
  of 
  Nebraska, 
  and 
  if 
  they 
  still 
  exist 
  they 
  should 
  be 
  

   considered 
  as 
  the 
  male 
  holotype 
  and 
  female 
  allotype 
  of 
  the 
  species. 
  

  

  This 
  species 
  may 
  be 
  distinguished 
  from 
  its 
  closely 
  related 
  forms 
  

   by 
  the 
  detailed 
  characters 
  as 
  given 
  in 
  the 
  key. 
  From 
  dubius 
  it 
  may 
  

   easily 
  be 
  distinguished 
  by 
  the 
  chaetotaxy 
  of 
  the 
  prosternal 
  plate, 
  

   dubius 
  having 
  three 
  longish 
  setae 
  set 
  in 
  a 
  row 
  along 
  the 
  edge 
  of 
  the 
  

   clear 
  area, 
  while 
  in 
  bruneri 
  there 
  are 
  eight 
  longish 
  setae 
  irregularly 
  

   placed 
  within 
  the 
  clear 
  area. 
  Ewing's 
  figure 
  shows 
  the 
  posterior 
  

   margin 
  of 
  the 
  prothorax 
  with 
  sides 
  angulated 
  and 
  median 
  portion 
  

   strongly 
  concave, 
  while 
  in 
  bruneri 
  the 
  posterolateral 
  angles 
  are 
  rounded 
  

   and 
  the 
  posterior 
  margin 
  is 
  almost 
  transverse. 
  In 
  dubius 
  the 
  meta- 
  

   thorax 
  has 
  the 
  sides 
  straight 
  and 
  is 
  "over 
  twice 
  as 
  broad 
  as 
  long," 
  

   while 
  in 
  bruneri 
  the 
  sides 
  of 
  metathorax 
  are 
  concave 
  and 
  its 
  width 
  

   is 
  three 
  times 
  the 
  length. 
  Ewing's 
  description 
  of 
  the 
  abdominal 
  

   chaetotaxy 
  is 
  very 
  vague 
  but 
  I 
  suspect 
  that 
  it 
  is 
  different 
  from 
  that 
  

   of 
  bruneri, 
  which 
  has 
  one 
  spine 
  in 
  lateral 
  angle 
  of 
  segment 
  I 
  and 
  one 
  

   slender, 
  submarginal 
  hair; 
  in 
  segment 
  II 
  there 
  are 
  one 
  spine 
  and 
  one 
  

   slender 
  hair 
  in 
  the 
  angle 
  and 
  a 
  longer, 
  coarser, 
  submarginal 
  dorsal 
  hair. 
  

   In 
  segments 
  III 
  to 
  VII 
  there 
  are 
  two 
  short 
  hairs 
  in 
  the 
  angle 
  and 
  

   one 
  long 
  submarginal 
  hair, 
  with 
  two 
  very 
  long 
  hairs 
  at 
  angles 
  of 
  

   segments 
  VIII 
  and 
  IX. 
  These 
  long 
  dorsal 
  hairs 
  become 
  progressively 
  

   longer 
  posteriorly. 
  

  

  In 
  dubius 
  the 
  parameres 
  are 
  incurved 
  apically, 
  their 
  tips 
  touching, 
  

   while 
  in 
  bruneri 
  they 
  are 
  almost 
  straight 
  in 
  one 
  specimen 
  and 
  sUghtly 
  

   incurved 
  apically 
  in 
  the 
  other. 
  

  

  