﻿G48 
  PItOCEEDI2sGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  GROUP 
  II. 
  (Type, 
  Aatacus 
  advena 
  Le 
  Conto. 
  ) 
  

  

  Tliird 
  segineiit 
  of 
  third 
  pair 
  of 
  legs 
  of 
  male 
  hooked. 
  First 
  pair 
  of 
  

   abdominal 
  appendages 
  of 
  male 
  similar 
  to 
  those 
  of 
  Group 
  1. 
  

  

  CAMBARUS 
  CARINATUS, 
  new 
  species. 
  

   (Plate 
  LXIII.) 
  

  

  Male, 
  Form. 
  I. 
  — 
  Rostrum 
  of 
  moderate 
  width, 
  excavated, 
  lateral 
  margins 
  

   slightly 
  convergent, 
  carinated, 
  and 
  armed 
  near 
  the 
  tip 
  with 
  a 
  pair 
  of 
  

   spiiiiform 
  teeth 
  ; 
  acumen 
  of 
  moderate 
  length, 
  reaching 
  to 
  the 
  distal 
  end 
  

   of 
  the 
  anteiinular 
  peduncle; 
  a 
  median 
  longitudinal 
  carina 
  extends 
  from 
  

   the 
  base 
  of 
  the 
  acumen 
  backward 
  to 
  the 
  level 
  of 
  the 
  eyes. 
  Carapace 
  

   coarsely 
  granulated 
  on 
  the 
  sides, 
  armed 
  with 
  a 
  pair 
  of 
  lateral 
  teeth 
  

   behind 
  the 
  cervical 
  groove; 
  branchiostegian 
  spine 
  small; 
  postorbital 
  

   ridges 
  furnished 
  with 
  sharp 
  anterior 
  spines, 
  i^osterior 
  spines 
  repre- 
  

   sented 
  by 
  slight 
  tubercles; 
  anterior 
  border 
  of 
  carapace 
  angulated 
  below 
  

   the 
  orbit. 
  Areola 
  of 
  moderate 
  width, 
  about 
  one-half 
  the 
  length 
  of 
  the 
  

   anterior 
  section 
  of 
  the 
  carapace. 
  

  

  Abdomen 
  equal 
  to 
  the 
  cephalo-thorax 
  in 
  length, 
  smooth; 
  i)leur{B 
  

   broad, 
  bluntly 
  angled. 
  Anterior 
  segment 
  of 
  telson 
  three-spined 
  on 
  

   each 
  side 
  of 
  the 
  posterior 
  margin; 
  x)osterior 
  segment 
  short, 
  rounded. 
  

  

  Basal 
  segment 
  of 
  antennule 
  armed 
  with 
  a 
  spine 
  below. 
  Antennal 
  

   scale 
  broadest 
  at 
  the 
  middle, 
  tapering 
  to 
  a 
  sharp 
  apical 
  spine. 
  A 
  sharp 
  

   tooth 
  at 
  external 
  base 
  of 
  the 
  antennal 
  scale. 
  Epistoma 
  triangular. 
  

  

  Chelipeds: 
  Merus 
  granulated 
  on 
  sui)erior 
  border, 
  and 
  armed 
  with 
  a 
  

   single 
  spine 
  near 
  the 
  distal 
  end; 
  lower 
  face 
  with 
  biserial 
  arrangement 
  

   of 
  s])ines; 
  carpus 
  tuberculate 
  within, 
  with 
  four 
  spiniform 
  teeth 
  near 
  

   the 
  anterior 
  border, 
  viz, 
  one 
  near 
  each 
  jjoint 
  of 
  articulation 
  with 
  the 
  

   propodite 
  and 
  two 
  between 
  tliese 
  jjoints; 
  hand 
  of 
  moderate 
  M'idth, 
  

   inflated, 
  covered 
  with 
  small 
  squamous 
  tubercles. 
  

  

  Third 
  segment 
  of 
  third 
  legs 
  hooked. 
  

  

  First 
  abdominal 
  appendages 
  stout, 
  curved 
  forward 
  at 
  apex, 
  inner 
  and 
  

   outer 
  parts 
  ending 
  in 
  a 
  small 
  horny 
  tooth, 
  anterior 
  margin 
  furnished 
  

   with 
  a 
  small 
  tooth 
  near 
  the 
  tip. 
  

  

  Length 
  125 
  mm.: 
  carapace 
  62 
  mm.; 
  length 
  from 
  tip 
  of 
  rostrum 
  to 
  

   cervical 
  groove 
  40 
  mm.; 
  length 
  of 
  rostrum 
  from 
  tip 
  to 
  anterior 
  spine 
  

   of 
  postorbital 
  ridge 
  17 
  mm.; 
  acumen 
  5 
  mm.; 
  cheliped 
  104 
  mm. 
  (merus 
  

   25 
  mm., 
  carpus 
  ir» 
  mm., 
  chela 
  51 
  mm., 
  dactylus 
  30 
  mm.); 
  breadth 
  of 
  

   chela 
  17 
  mm. 
  

  

  Ty^e.— 
  Guadalajara, 
  Mexico, 
  altitude 
  5,200 
  feet 
  (No. 
  17699, 
  U.S.N.M.), 
  

   P. 
  L. 
  Jouy. 
  One 
  male. 
  Form 
  I. 
  

  

  Ameca, 
  Jalisco, 
  Mexico 
  (No. 
  16085, 
  U.S.N.M.), 
  A. 
  Duges. 
  Hacienda 
  

   de 
  Villachuato, 
  Michoacan, 
  Mexico 
  (No. 
  17707, 
  U.S.N. 
  M.), 
  A. 
  Duges. 
  

   Three 
  males, 
  Form 
  I. 
  

  

  According 
  to 
  the 
  manuscript 
  label 
  this 
  species 
  is 
  brought 
  to 
  the 
  

   market 
  of 
  Guadalajara 
  as 
  food. 
  

  

  