﻿Order 
  PLATYPTERA. 
  

  

  This 
  is 
  an 
  aggregation 
  of 
  loosely-jointed 
  species, 
  very 
  few 
  of 
  which 
  

   occur 
  in 
  our 
  State. 
  It 
  is 
  not 
  numerous 
  at 
  best 
  and, 
  as 
  represented 
  with 
  us, 
  

   consists 
  of 
  rather 
  large 
  forms, 
  the 
  head 
  as 
  broad 
  or 
  broader 
  than 
  the 
  

   square 
  or 
  oblong 
  thorax, 
  the 
  mandibles 
  large 
  and 
  sometimes 
  prominent, 
  

   antennae 
  many-jointed 
  and 
  often 
  pectinated 
  in 
  the 
  male. 
  The 
  wings 
  are 
  

   large, 
  net-veined, 
  the 
  posterior 
  not 
  much 
  the 
  larger 
  and 
  folded 
  only 
  once 
  

   near 
  the 
  anal 
  angle 
  when 
  at 
  rest 
  beneath 
  the 
  anterior 
  pair 
  which 
  covers 
  

   them. 
  The 
  early 
  stages 
  are 
  passed 
  in 
  the 
  water, 
  under 
  stones 
  or 
  among 
  

   the 
  vegetation 
  at 
  the 
  bottom 
  of 
  running 
  streams. 
  The 
  larvae 
  are 
  rather 
  

   long 
  and 
  flattened, 
  usually 
  blackish, 
  and 
  breathe 
  by 
  means 
  of 
  a 
  series 
  of 
  

   gill-tufts. 
  When 
  full 
  grown 
  they 
  crawl 
  on 
  shore, 
  burrow 
  into 
  the 
  soil, 
  or 
  

   an 
  old 
  stump, 
  or 
  under 
  a 
  stone 
  and 
  pupate; 
  the 
  transformations 
  are 
  com- 
  

   plete. 
  

  

  Fig. 
  12. 
  — 
  Corydalis 
  cornuta 
  : 
  a. 
  larva, 
  "hellgramite" 
  or 
  "dobson"; 
  b, 
  pupa; 
  c, 
  male 
  

   adult; 
  d, 
  head 
  of 
  female, 
  showing 
  the 
  comparatively 
  small 
  jaws; 
  natural 
  size. 
  

  

  (55) 
  

  

  