﻿554 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  los 
  

  

  Mendham, 
  N. 
  J.; 
  and 
  Pasadena, 
  Calif. 
  (M. 
  R. 
  Wheeler). 
  The 
  CaH- 
  

   fomia 
  specimen 
  is 
  most 
  unexpected, 
  but 
  it 
  is 
  certain 
  that 
  it 
  was 
  col- 
  

   lected 
  in 
  Pasadena, 
  and 
  it 
  closely 
  resembles 
  eastern 
  specimens. 
  

  

  This 
  species 
  is 
  the 
  genotype 
  of 
  Sphyroperiscelis 
  Sturtevant. 
  

  

  The 
  puparium 
  is 
  rather 
  flattened, 
  tapering 
  at 
  both 
  ends, 
  and, 
  not 
  

   including 
  posterior 
  spiracular 
  processes, 
  is 
  nearly 
  three 
  times 
  as 
  long 
  

   as 
  broad. 
  Surface 
  dark 
  brown, 
  granular. 
  There 
  is 
  a 
  conspicuous 
  

   thornlike 
  process 
  on 
  each 
  lateral 
  margin 
  of 
  each 
  abdominal 
  segment. 
  

   The 
  posterior 
  spiracles 
  are 
  on 
  tapering 
  divergent 
  processes, 
  each 
  of 
  

   which 
  is 
  nearly 
  half 
  as 
  long 
  as 
  the 
  maximum 
  breadth 
  of 
  the 
  puparium. 
  

   There 
  are 
  no 
  stalks 
  to 
  the 
  anterior 
  spiracles. 
  

  

  Periscelis 
  occidentalis, 
  new 
  species 
  

  

  Alale. 
  Antennae 
  yeUow, 
  broNvnish 
  dorsally. 
  Frons 
  dark 
  brown, 
  

   subshining. 
  Face 
  pale 
  yellowish, 
  brown 
  below 
  centrally; 
  entire 
  oral 
  

   margin 
  silvery 
  white. 
  Mesonotum, 
  scutellum, 
  and 
  humeri 
  sub- 
  

   shining 
  black. 
  Pleurae 
  brown. 
  Legs 
  pale 
  yellow, 
  two 
  dark 
  brown 
  

   annular 
  bands 
  on 
  each 
  femur 
  and 
  each 
  tibia. 
  Wing 
  with 
  rather 
  in- 
  

   distinct 
  broad 
  median 
  darkened 
  area 
  (including 
  anterior 
  crossvein, 
  

   most 
  of 
  first 
  vein, 
  basal 
  section 
  of 
  third 
  vein, 
  and 
  two 
  basal 
  sections 
  of 
  

   fourth), 
  and 
  a 
  dark 
  tip. 
  Abdomen 
  black, 
  subshining. 
  

  

  Arista 
  with 
  about 
  5 
  rather 
  short 
  branches 
  above, 
  3 
  below. 
  No 
  

   differentiated 
  vibrissae. 
  Face 
  in 
  profile 
  concave 
  above 
  oral 
  margin, 
  

   with 
  a 
  hump 
  below 
  antennal 
  insertions. 
  Eyes 
  oblique. 
  Frons 
  about 
  

   three-fifths 
  width 
  of 
  head, 
  as 
  seen 
  from 
  above. 
  Postverticals 
  strong, 
  

   divergent. 
  Two 
  pairs 
  of 
  dorsocentrals, 
  both 
  postsutural. 
  Acrostichal 
  

   hairs 
  rather 
  sparse, 
  not 
  in 
  distinct 
  rows. 
  Scutellum 
  with 
  four 
  mar- 
  

   ginal 
  bristles, 
  anterior 
  pair 
  about 
  half 
  length 
  of 
  posterior 
  ones. 
  One 
  

   humeral, 
  two 
  notopleurals. 
  Mesopleura 
  bare. 
  No 
  preapical 
  tibial 
  

   bristles. 
  

  

  First 
  vein 
  ends 
  near 
  middle 
  of 
  wing. 
  Auxiliary 
  vein 
  rudimentary, 
  

   does 
  not 
  bend 
  anteriorly 
  at 
  apex. 
  Posterior 
  crossvein 
  present 
  but 
  

   very 
  faint. 
  Second 
  vein 
  strongly 
  curved 
  posteriorly 
  in 
  distal 
  section. 
  

   Discal 
  and 
  second 
  basal 
  cells 
  separated. 
  Anal 
  crossvein 
  faint. 
  

   Costal 
  index 
  about 
  6, 
  fourth 
  vein 
  index 
  about 
  3. 
  Costa 
  reaches 
  only 
  

   to 
  apex 
  of 
  third 
  vein. 
  

  

  Length, 
  2}i 
  mm., 
  wing, 
  2 
  mm. 
  

  

  Type 
  from 
  Cottonwood 
  Springs 
  (near 
  Mecca, 
  Riverside 
  County), 
  

   Calif., 
  May 
  1939 
  (USNM 
  61473). 
  Sixteen 
  paratypes 
  from 
  Cotton- 
  

   wood 
  Springs, 
  Pasadena 
  (M. 
  R. 
  Wheeler), 
  and 
  Lancaster, 
  Calif., 
  

   Prescott, 
  Ariz. 
  (M. 
  R. 
  Wheeler), 
  and 
  Mogollon, 
  N. 
  Mex. 
  (M. 
  R. 
  

   Wheeler). 
  Dr. 
  Wheeler 
  states 
  that 
  he 
  also 
  has 
  collected 
  this 
  species 
  

   at 
  Peshashtin, 
  Wash., 
  Patagonia, 
  Ariz., 
  and 
  Fort 
  Davis, 
  Tex. 
  

  

  