﻿208 
  PBOCEEDIXGS 
  OF 
  THE 
  XATIOXAL 
  MUSEUM. 
  vol.xx. 
  

  

  marked 
  ou 
  the 
  prozona 
  by 
  the 
  flavoiis 
  "stripe 
  bordering 
  the 
  piceous 
  i^atch 
  ; 
  

   mediau 
  carina 
  percurrent, 
  dull 
  and 
  heavy, 
  more 
  pronounced 
  on 
  the 
  pro- 
  

   zona 
  than 
  on 
  the 
  metazona; 
  front 
  inargin 
  subtruneate, 
  feebly 
  and 
  nar- 
  

   rowly 
  flaring 
  in 
  the 
  male, 
  hind 
  margin 
  broadly 
  and 
  roundly 
  but 
  not 
  

   deeply 
  emarginate; 
  prozona 
  punctate 
  next 
  the 
  front 
  margin, 
  distinctly 
  

   longitudinal 
  (male) 
  or 
  quadrate 
  (female), 
  mesially 
  twice 
  as 
  long 
  (male) 
  or 
  

   fully 
  half 
  as 
  long 
  again 
  (female) 
  as 
  the 
  finely 
  punctate 
  metazona. 
  Pro- 
  

   sternal 
  spine 
  appressed 
  conical 
  and 
  slightly 
  retrorse 
  (male) 
  or 
  erect, 
  

   conical 
  (female), 
  rather 
  longand 
  slender 
  ; 
  interspace 
  ))etween 
  mesosterual 
  

   lobes 
  transversely 
  subquadrate 
  (male) 
  or 
  a 
  little 
  transverse 
  (female), 
  the 
  

   metasterual 
  lobes 
  subattingent 
  (male) 
  or 
  somewhat 
  approximate 
  

   (female). 
  Tegmina 
  about 
  as 
  long 
  as 
  the 
  prozona, 
  ellii)tical, 
  about 
  three 
  

   times 
  as 
  long 
  as 
  broad, 
  broadly 
  rounded 
  at 
  tip, 
  lateral, 
  widely 
  distant, 
  

   black 
  with 
  testaceous 
  veins. 
  Fore 
  and 
  middle 
  femora 
  somewhat 
  en- 
  

   larged 
  especially 
  in 
  depth 
  in 
  the 
  male; 
  hind 
  femora 
  flavous, 
  more 
  or 
  

   less 
  longitudinally 
  infuscated 
  or 
  ferruginous, 
  especially 
  ou 
  or 
  next 
  the 
  

   carinae, 
  the 
  genicular 
  arc 
  piceous, 
  the 
  lower 
  genicular 
  lobe 
  wholly 
  pallid; 
  

   hind 
  tibiae 
  pale 
  dull 
  flavous, 
  delicately 
  mottled 
  with 
  ferruginous, 
  the 
  

   spines 
  black 
  excepting 
  at 
  base, 
  eight 
  (female) 
  or 
  ten 
  (male) 
  in 
  number 
  

   in 
  the 
  outer 
  series. 
  Abdomen 
  feebly 
  carinate, 
  nearly 
  uniform 
  in 
  color, 
  

   the 
  extremity 
  subclavate 
  in 
  the 
  male, 
  a 
  little 
  recurved, 
  the 
  supraanal 
  

   plate 
  triangular, 
  roundly 
  acutangulate 
  at 
  tip, 
  the 
  surface 
  vaulted, 
  with 
  

   a 
  large 
  subbasal 
  rounded 
  basin 
  taking 
  the 
  place 
  of 
  the 
  usual 
  mediau 
  

   sulcus, 
  and 
  into 
  which 
  falls 
  the 
  furcula, 
  consisting 
  of 
  a 
  pair 
  of 
  very 
  

   slender, 
  parallel 
  and 
  adjacent, 
  subequal, 
  cylindrical 
  fingers, 
  extending 
  

   less 
  than 
  a 
  third 
  the 
  distance 
  across 
  the 
  plate; 
  cerci 
  slender, 
  gradually 
  

   incurved 
  but 
  otherwise 
  straight, 
  compressed 
  blades, 
  tapering 
  at 
  the 
  

   very 
  base, 
  but 
  beyond 
  subequal, 
  rounded 
  at 
  tip, 
  considerably 
  shorter 
  

   than 
  the 
  suj)raanal 
  plate; 
  subgenital 
  plate 
  small, 
  subpyramidal, 
  of 
  

   about 
  equal 
  breadth 
  and 
  length, 
  the 
  margin 
  apically 
  angulate, 
  entire. 
  

  

  Length 
  of 
  body, 
  male, 
  17.5 
  mm., 
  female, 
  31.5 
  mm.; 
  antennae, 
  male 
  

   and 
  female, 
  11 
  mm. 
  ; 
  tegmina, 
  male, 
  3 
  mm., 
  female, 
  5 
  mm, 
  ; 
  hind 
  femora, 
  

   male, 
  12 
  mm., 
  female, 
  17 
  mm. 
  

  

  One 
  male, 
  1 
  female. 
  Tepic, 
  Jalisco, 
  Mexico, 
  November, 
  Coll. 
  Calif. 
  

   Acad. 
  Sc. 
  (L. 
  Bruner) 
  ; 
  Cape 
  St. 
  Lucas, 
  Lower 
  California 
  ( 
  ?), 
  J. 
  Xantus. 
  

  

  The 
  female, 
  collected 
  by 
  Xantus 
  (presumably 
  at 
  Cape 
  St. 
  Lucas), 
  is 
  

   the 
  one 
  referred 
  to 
  by 
  me 
  in 
  my 
  original 
  description 
  of 
  M. 
  aridus 
  as 
  

   belonging 
  to 
  that 
  species, 
  but 
  it 
  difters 
  from 
  it 
  (and 
  agrees 
  with 
  J/. 
  

   hionphreysii) 
  in 
  the 
  emargination 
  of 
  the 
  posterior 
  border 
  of 
  the 
  pro- 
  

   notum, 
  and 
  differs 
  from 
  both 
  in 
  the 
  greater 
  robustness 
  of 
  the 
  body, 
  

   especially 
  in 
  the 
  metathoracic 
  region. 
  It 
  is 
  quite 
  possible 
  that 
  the 
  

   male 
  and 
  female 
  here 
  brought 
  together 
  do 
  not 
  properly 
  belong 
  to 
  one 
  

   species; 
  there 
  is 
  great 
  disparity 
  in 
  size 
  and, 
  as 
  the 
  description 
  shows, 
  

   some 
  unusual 
  disagreements 
  between 
  sexes 
  of 
  the 
  same 
  species; 
  but 
  

   they 
  certainly 
  belong 
  in 
  close 
  proximity, 
  even 
  if 
  distinct 
  ; 
  if 
  they 
  should 
  

   prove 
  distinct, 
  the 
  name 
  should 
  be 
  retained 
  for 
  the 
  male, 
  from 
  which 
  

   the 
  description 
  (especially 
  in 
  colois) 
  has 
  principally 
  been 
  drawn. 
  

  

  