﻿442 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  1894 
  Gompbus 
  parvulus 
  Banks, 
  Can. 
  ent. 
  24 
  : 
  77 
  (recorded 
  from 
  Ithaca) 
  

  

  1895 
  Goraphus 
  parvulus 
  Calvert, 
  N. 
  Y. 
  ent. 
  soc. 
  Jour. 
  3 
  : 
  44 
  (recorded 
  

  

  from 
  Ithaca) 
  

   1897 
  Gomphns 
  parvulus 
  Needham, 
  Can. 
  ent. 
  29 
  : 
  165, 
  166, 
  167 
  (made 
  the 
  

   type 
  of 
  a 
  new 
  genus, 
  L 
  a 
  n 
  t 
  h 
  u 
  s 
  : 
  nymph, 
  found 
  at 
  Ithaca 
  N. 
  Y. 
  identified 
  

   with 
  those 
  described 
  by 
  Dr 
  Hagen 
  from 
  Rocky 
  creek 
  Ky. 
  in 
  Trans. 
  Am. 
  

   ent. 
  soc. 
  1885, 
  12:281 
  and 
  doubtfully 
  referred 
  by 
  him 
  toTJropetala 
  

   (Tachopteryx) 
  tboreyi: 
  nymph 
  figured, 
  pi. 
  7, 
  fig. 
  8-10) 
  

  

  The 
  habits 
  of 
  the 
  imagos 
  of 
  this 
  species 
  are 
  unknown. 
  The 
  few 
  speci- 
  

   mens 
  I 
  was 
  able 
  to 
  obtain 
  at 
  Ithaca 
  in 
  1897 
  were 
  all 
  bred, 
  and 
  I 
  saw 
  no 
  

   imagos 
  at 
  large. 
  The 
  nymphs 
  are 
  very 
  interesting 
  httle 
  fellows, 
  quite 
  as 
  

   different 
  in 
  certain 
  habits 
  as 
  they 
  are 
  in 
  structure 
  and 
  appearance 
  from 
  

   other 
  gomphines. 
  They 
  seem 
  to 
  prefer 
  little, 
  trickUng 
  streams 
  fed 
  by 
  

   springs, 
  and 
  burrow 
  in 
  beds 
  of 
  sand 
  in 
  the 
  deeper 
  parts. 
  They 
  are 
  more 
  

   agile 
  than 
  other 
  gomphine 
  nymphs, 
  burrow 
  more 
  rapidly, 
  and, 
  when 
  with- 
  

   drawn 
  from 
  the 
  water, 
  unlike 
  others, 
  they 
  feign 
  death, 
  and 
  lie 
  quite 
  still 
  

   for 
  a 
  number 
  of 
  minutes. 
  On 
  account 
  of 
  this 
  habit, 
  as 
  well 
  as 
  on 
  

   account 
  of 
  the 
  mottled 
  coloration 
  of 
  the 
  body, 
  they 
  are 
  much 
  more 
  diffi- 
  

   cult 
  to 
  detect 
  while 
  collecting 
  than 
  are 
  the 
  others 
  which 
  begin 
  active 
  

   struggling 
  as 
  soon 
  as 
  the 
  net 
  is 
  lifted 
  above 
  the 
  water. 
  

  

  Nymph. 
  (PL 
  i8,fig. 
  6and2o,fig, 
  8-10) 
  Total 
  length 
  23 
  mm; 
  abdomen 
  

   14 
  mm; 
  hind 
  femur 
  5 
  mm; 
  width 
  of 
  head 
  5 
  mm, 
  of 
  abdomen 
  6 
  mm. 
  

  

  Body 
  somewhat 
  depressed, 
  a 
  Httle 
  hairy 
  on 
  the 
  genae 
  and 
  on 
  the 
  

   tibiae, 
  elsewhere 
  bare 
  ; 
  head 
  concave 
  on 
  the 
  hind 
  margin; 
  antennae, 
  

   with 
  the 
  two 
  basal 
  segments 
  short 
  and 
  angular, 
  the 
  first 
  a 
  little 
  larger, 
  

   the 
  articulation 
  between 
  the 
  first 
  and 
  second 
  a 
  little 
  oblique, 
  the 
  third 
  

   segment 
  obliquely 
  oval, 
  flat, 
  one 
  third 
  longer 
  than 
  wide, 
  with 
  a 
  depressed 
  

   smooth 
  oval 
  area 
  within 
  the 
  scurfy 
  pubescent 
  marginal 
  rim, 
  the 
  fourth 
  

   segment 
  a 
  minute 
  round 
  rudiment, 
  at 
  the 
  inner 
  apical 
  angle 
  of 
  the 
  third 
  ; 
  

   labium 
  mentum 
  a 
  little 
  longer 
  than 
  broad, 
  its 
  front 
  border 
  appearing 
  

   convex 
  by 
  the 
  rounded 
  fringe 
  of 
  scales, 
  in 
  the 
  midst 
  and 
  at 
  the 
  base 
  of 
  

   which 
  are 
  four 
  to 
  six 
  brown, 
  minute 
  quadrangular 
  teeth 
  ; 
  lateral 
  iobe 
  

   little 
  arcuate, 
  the 
  distal 
  angle 
  produced 
  and 
  inclined 
  internally, 
  but 
  hard- 
  

   ly 
  differentiated 
  from 
  the 
  six 
  teeth 
  on 
  the 
  inner 
  margin, 
  these 
  teeth 
  all 
  

   largest 
  in 
  the 
  middle, 
  and 
  a 
  line 
  connecting 
  their 
  summits 
  would 
  be 
  con- 
  

   vex 
  internally. 
  

  

  Abdomen 
  stocky, 
  widened 
  to 
  the 
  seventh 
  segment, 
  and 
  thereafter 
  nar- 
  

   rowed, 
  most 
  narrowed 
  on 
  the 
  ninth 
  segment; 
  no 
  dorsal 
  hooks 
  at 
  all, 
  

   but 
  a 
  median 
  impressed 
  line 
  ending 
  on 
  the 
  seventh 
  segment; 
  lateral 
  spines 
  

   well 
  developed 
  on 
  segments 
  8 
  and 
  9, 
  on 
  9 
  broadly 
  triangular, 
  and 
  con- 
  

   siderably 
  shorter 
  than 
  the 
  loth 
  segment, 
  against 
  the 
  sides 
  of 
  which 
  they 
  

   are 
  closely 
  applied; 
  loth 
  segment 
  one 
  half 
  as 
  long 
  as 
  the 
  eighth, 
  one 
  

   third 
  as 
  long 
  as 
  the 
  ninth, 
  three 
  fifths 
  as 
  long 
  as 
  the 
  superior 
  and 
  inferior 
  

   appendages; 
  three 
  fourths 
  as 
  long 
  as 
  the 
  others. 
  

  

  