﻿OBSERVATIONS 
  ON 
  THE 
  ASTJCIDJi— 
  FAXON. 
  657 
  

  

  The 
  first 
  pair 
  of 
  abdominal 
  appendages 
  of 
  the 
  first 
  form 
  of 
  the 
  male 
  

   are 
  short 
  and 
  stoat, 
  reaching 
  forward 
  only 
  to 
  the 
  base 
  of 
  the 
  antepe- 
  

   nultimate 
  pair 
  of 
  thoracic 
  legs. 
  They 
  end 
  in 
  two 
  short, 
  recurved 
  

   styles, 
  the 
  inner 
  (or 
  posterior) 
  of 
  which 
  is 
  slender 
  and 
  more 
  strongly 
  

   recurved 
  than 
  the 
  outer 
  one. 
  In 
  males 
  of 
  the 
  second 
  form, 
  these 
  

   appendages 
  are 
  split 
  for 
  only 
  a 
  short 
  distance 
  from 
  the 
  tip, 
  and 
  the 
  free 
  

   ends 
  are 
  stouter, 
  blunter, 
  and 
  less 
  strongly 
  recurved. 
  The 
  anterior 
  

   wall 
  of 
  the 
  annulus 
  of 
  the 
  female 
  is 
  depressed 
  to 
  the 
  level 
  of 
  the 
  ster- 
  

   luim 
  so 
  that 
  there 
  is 
  no 
  distinct 
  central 
  fossa. 
  The 
  posterior 
  wall, 
  on 
  

   the 
  other 
  hand, 
  is 
  very 
  thick 
  and 
  protuberant, 
  forming 
  a 
  transverse 
  

   tubercle 
  across 
  the 
  hind 
  margin 
  of 
  the 
  penultimate 
  thoracic 
  sternum. 
  

   The 
  chela 
  of 
  the 
  female 
  is 
  shorter 
  and 
  broader 
  than 
  that 
  of 
  the 
  first 
  

   form 
  of 
  the 
  male, 
  and 
  the 
  dactylus 
  less 
  bowed. 
  The 
  chela 
  of 
  the 
  second 
  

   form 
  of 
  the 
  male 
  is 
  similar 
  to 
  that 
  of 
  the 
  female. 
  

  

  Length 
  93 
  mm.; 
  carajiace 
  46 
  mm.; 
  rostrum 
  11.5 
  mm.; 
  from 
  tip 
  of 
  

   rostrum 
  to 
  cervical 
  groove 
  30 
  mm.; 
  from 
  cervical 
  groove 
  to 
  hind 
  border 
  

   of 
  carapace 
  16 
  mm. 
  ; 
  antenna 
  106 
  mm. 
  ; 
  cheiiped 
  00 
  mm. 
  ; 
  merus 
  20 
  mm. 
  ; 
  

   carpus 
  13 
  mm. 
  ; 
  chela 
  IS 
  mm. 
  ; 
  dactylus 
  'Sii 
  mm. 
  ; 
  width 
  of 
  palm 
  10 
  mm. 
  ; 
  

   length 
  of 
  inner 
  border 
  of 
  palm 
  11 
  mm.; 
  length 
  uf 
  first 
  pair 
  of 
  abdom- 
  

   inal 
  appendages 
  12 
  mm. 
  

  

  McAlister, 
  Indian 
  Territory. 
  (Coll. 
  Mus. 
  Comp. 
  Zool., 
  from 
  S. 
  E. 
  

   Meek.) 
  Twelve 
  males. 
  Form 
  I; 
  five 
  males, 
  Form 
  II; 
  eleven 
  females. 
  

   Prairie 
  Grove, 
  AVashington 
  County, 
  Arkansas. 
  (Coll. 
  S. 
  E. 
  Meek.) 
  

   One 
  male, 
  Form 
  I. 
  

  

  This 
  species 
  bears 
  the 
  closest 
  possible 
  resemblance 
  to 
  Camhdrus 
  

   pahneri 
  longimaniis, 
  with 
  which 
  it 
  would 
  surely 
  be 
  confounded 
  if 
  it 
  

   were 
  not 
  for 
  the 
  peculiar 
  form 
  of 
  the 
  sexual 
  appendages 
  of 
  the 
  male. 
  

   These 
  organs 
  consist 
  of 
  a 
  stout 
  peduncle 
  terminating 
  in 
  two 
  very 
  short 
  

   recurved 
  spimes. 
  In 
  G. 
  pahneri 
  lon(jimanus 
  the 
  two 
  terminal 
  spines 
  are 
  

   represented 
  by 
  two 
  very 
  long 
  slender 
  branches, 
  equal 
  in 
  length 
  to 
  the 
  

   peduncle 
  itself. 
  The 
  annulus 
  veutralis 
  of 
  the 
  female 
  also 
  differs 
  from 
  

   that 
  of 
  ('. 
  p((bneri 
  inasuuich 
  as 
  the 
  central 
  fossa 
  is 
  well-nigh 
  obliterated. 
  

  

  The 
  upper 
  side 
  of 
  the 
  wrist 
  and 
  hand 
  display 
  the 
  same 
  spots 
  of 
  dark 
  

   color 
  which 
  are 
  seen 
  in 
  C. 
  palmcri 
  longimanus. 
  

  

  CAMBARUS 
  MEEKI, 
  new 
  species. 
  

  

  (Plate 
  LXV, 
  figs. 
  5-9.) 
  

  

  Cephalo 
  thorax 
  cylindrical, 
  polished, 
  conspicuously 
  punctate, 
  except 
  

   in 
  the 
  middle 
  of 
  the 
  gastric 
  area, 
  granulated 
  on 
  the 
  anterior 
  portion 
  of 
  

   the 
  sides, 
  lateral 
  spine 
  small 
  or 
  obsolete, 
  anterolateral 
  border 
  bluntly 
  

   angulated 
  below 
  the 
  orbit, 
  postorbital 
  ridges 
  armed 
  with 
  a 
  sharp 
  ante- 
  

   rior 
  spine. 
  Rostrum 
  deei)ly 
  excavated, 
  often 
  very 
  faintly 
  carinated 
  

   near 
  the 
  tij); 
  margins 
  thiciiened, 
  concave, 
  strongly 
  divergent 
  at 
  base, 
  

   each 
  with 
  a 
  longitudinal 
  row 
  of 
  impressed 
  dots; 
  lateral 
  spines 
  and 
  

   acumen 
  horny-tipped, 
  strongly 
  upturned; 
  acumen 
  reaching 
  to 
  distal 
  

   end 
  of 
  antenuular 
  peduncle. 
  Areola 
  narrow, 
  punctate. 
  Anterior 
  

   Proc. 
  N. 
  M. 
  vol. 
  XX 
  42 
  

  

  