﻿30 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  io3 
  

  

  Exuviae 
  split 
  lengthwise 
  on 
  dorsum, 
  from 
  epistoma 
  to 
  tenth 
  ab- 
  

   dominal 
  segment; 
  presumed 
  antenna 
  consisting 
  of 
  circular 
  socket 
  

   (jBg. 
  8, 
  d) 
  with 
  three 
  tiny 
  unpigmented 
  circles 
  in 
  center, 
  each 
  bearing 
  

   a 
  central 
  spot 
  of 
  pigment; 
  mouth 
  parts 
  (fig. 
  8, 
  a) 
  with 
  mandibles 
  

   the 
  most 
  characteristic 
  and 
  best 
  preserved 
  of 
  the 
  parts 
  ; 
  mandible 
  thin, 
  

   much 
  flattened, 
  biting 
  margin 
  with 
  large 
  apical 
  tooth 
  and 
  about 
  10 
  

   acute 
  smaller 
  teeth 
  in 
  a 
  single 
  row 
  along 
  apical 
  third, 
  an 
  emargination 
  

   a 
  little 
  posterior 
  to 
  the 
  teeth, 
  portion 
  of 
  margin 
  overlaid 
  by 
  labrum 
  

   scarcely 
  pigmented, 
  a 
  well-sclerotized 
  and 
  pigmented 
  region 
  at 
  base 
  

   of 
  mesal 
  margin; 
  posterior 
  margins 
  of 
  mandible 
  with 
  a 
  prominent 
  

   black 
  ventral 
  condyle, 
  a 
  small 
  seta 
  near 
  base 
  of 
  long 
  lateral 
  apodeme 
  

   (presumed 
  mesal 
  apodeme 
  for 
  muscle 
  attachment 
  missing 
  in 
  available 
  

   material) 
  ; 
  labrum 
  largely 
  membranous, 
  with 
  irregular 
  transverse 
  

   wrinkles, 
  a 
  constricted 
  pigmented 
  sclerite 
  mesally, 
  about 
  five 
  subapical 
  

   minute 
  pits 
  arranged 
  transversely 
  on 
  each 
  lateral 
  half; 
  a 
  poorly 
  

   defined, 
  somewhat 
  striated 
  organ 
  leading 
  posteriorly 
  to 
  labial 
  sclerome 
  

   from 
  base 
  of 
  labrum, 
  dorsad 
  of 
  remnants 
  of 
  apparent 
  esophagus 
  

   (es) 
  ; 
  labial 
  and 
  maxillary 
  scleromes 
  showing 
  somewhat 
  different 
  

   shape 
  in 
  flattened 
  aspect 
  than 
  in 
  natural 
  position 
  on 
  alcoholic 
  larva. 
  

  

  Integument 
  of 
  most 
  of 
  thorax 
  and 
  abdomen 
  smooth, 
  microscopically 
  

   marked 
  into 
  platelets 
  of 
  different 
  shapes 
  on 
  various 
  areas 
  of 
  the 
  

   body, 
  averaging 
  transversely 
  elongate 
  ventrally, 
  irregularly 
  quadrate 
  

   (fig. 
  9, 
  a) 
  dorsally 
  on 
  thorax 
  and 
  anterior 
  half 
  of 
  abdomen; 
  ventral 
  

   region 
  of 
  neck 
  and 
  prothorax 
  bearing 
  minute 
  asperities 
  of 
  varied 
  

   character 
  (fig. 
  9, 
  J) 
  , 
  some 
  setiform, 
  others 
  in 
  form 
  of 
  sharp 
  rugosities 
  ; 
  

   less 
  developed 
  asperities 
  on 
  ventral 
  surface 
  of 
  abdomen; 
  specialized 
  

   platelets 
  on 
  venter 
  of 
  abdominal 
  segments 
  1 
  to 
  8 
  (poorly 
  developed 
  

   on 
  1 
  to 
  3 
  and 
  8, 
  well 
  developed 
  on 
  4 
  to 
  7), 
  of 
  irregular 
  grouping 
  on 
  4 
  

   and 
  5 
  (fig. 
  9, 
  c), 
  others 
  transverse 
  (fig. 
  9, 
  d). 
  Spiracles 
  each 
  sur- 
  

   rounded 
  by 
  narrow 
  irregular 
  area 
  of 
  membrane, 
  the 
  external 
  portion 
  

   a 
  circular 
  flattened 
  disk 
  with 
  small 
  central 
  opening 
  ; 
  trachea 
  tapering 
  

   to 
  spiracular 
  opening, 
  with 
  internal 
  ring 
  (tr, 
  fig. 
  8, 
  &) 
  which 
  may 
  

   function 
  as 
  closing 
  apparatus. 
  Modified 
  anus 
  (fig. 
  8, 
  e) 
  with 
  well- 
  

   sclerotized 
  and 
  pigmented 
  closing 
  valves 
  (cv), 
  integument 
  at 
  lateral 
  

   extremities 
  wrinkled, 
  that 
  posterior 
  and 
  anterior 
  to 
  valves 
  moderately 
  

   pigmented, 
  a 
  short 
  section 
  of 
  membrane 
  on 
  internal 
  surface 
  an 
  appar- 
  

   ent 
  remnant 
  of 
  hind 
  gut 
  (hg) 
  . 
  

  

  Exuviae 
  of 
  the 
  first 
  three 
  instars 
  are 
  very 
  closely 
  appressed 
  to 
  each 
  

   other 
  along 
  the 
  posterior 
  half 
  of 
  their 
  abdominal 
  sterna, 
  so 
  much 
  so 
  

   that 
  they 
  can 
  scarcely 
  be 
  separated 
  without 
  injury 
  to 
  the 
  specimens. 
  

   The 
  closest 
  attachment 
  appears 
  to 
  be 
  a 
  little 
  anterior 
  to 
  the 
  modified 
  

   anal 
  opening 
  (hold-fast 
  organ) 
  . 
  The 
  platelets 
  comprising 
  the 
  micro- 
  

   structure 
  of 
  the 
  inteis:ument 
  on 
  the 
  lateral 
  and 
  dorsal 
  surfaces 
  of 
  

  

  