﻿740 
  

  

  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  Sciitollum 
  broader 
  than 
  long, 
  transverse 
  groove 
  slightly 
  curved 
  back- 
  

   ward. 
  Last 
  ventral 
  segment 
  with 
  hind 
  margin 
  nearly 
  truncate. 
  Color 
  

   pale 
  yellow 
  marked 
  with 
  smoky; 
  face 
  and 
  vertex 
  pale 
  yellowish, 
  ])os- 
  

   terior 
  one-half 
  of 
  latter 
  with 
  a 
  median 
  black 
  line; 
  pronotum 
  pale 
  yellow 
  

   on 
  anterior 
  and 
  lateral 
  margins, 
  remainder 
  darker; 
  scutellnm 
  black, 
  

   basal 
  angles 
  sometimes 
  yellowish; 
  elytra 
  yellowish, 
  subhyaline, 
  apex 
  

   smoky, 
  clavus 
  with 
  a 
  large 
  deej) 
  smoky 
  blotch 
  at 
  tip; 
  venter 
  blackish, 
  

   last 
  segment 
  yellow; 
  tergum 
  blackish, 
  with 
  tips 
  and 
  lateral 
  margins 
  of 
  

   segments 
  more 
  or 
  less 
  yellowish; 
  prosternum 
  black; 
  legs 
  pale 
  yellow. 
  

   Length, 
  3 
  mm. 
  Described 
  from 
  two 
  females. 
  (See 
  Figs. 
  80, 
  81, 
  82.) 
  

   The 
  types 
  were 
  taken 
  by 
  myself 
  at 
  Dolores, 
  Colorado, 
  

   June 
  18, 
  and 
  a 
  single 
  specimen 
  has 
  been 
  received 
  from 
  Mr. 
  

   Heidemann, 
  label.»d 
  "Wasatch, 
  Ut., 
  ()-27." 
  I 
  ha^e 
  recently 
  

   taken 
  a 
  large 
  number 
  of 
  specimens 
  (August 
  21) 
  at 
  Cerro 
  

   Summit, 
  Colorado, 
  on 
  Sage-brush, 
  Artemisia 
  tridentata, 
  

   where 
  it 
  was 
  associated 
  with 
  var. 
  

   Tyjihlocyhoids 
  Gillette 
  & 
  Baker. 
  

  

  VAEIETY 
  TYPHLOCYBOIDS 
  Gillette 
  & 
  Baker. 
  

  

  Empoasca 
  tiiph 
  locyhoids 
  Gillette 
  & 
  Baker, 
  

   Bull. 
  31, 
  Colo. 
  Agr. 
  Exp. 
  Sta., 
  p. 
  110. 
  1895. 
  

  

  Male: 
  Clypeus 
  subacute 
  at 
  apex, 
  

   one 
  fifth 
  longer 
  than 
  broad, 
  basal 
  

   suture 
  straight; 
  lorte 
  one-half 
  as 
  wide 
  

   and 
  two 
  thirds 
  as 
  long 
  as 
  clypeus; 
  

   gena^ 
  narrow, 
  not 
  attaining 
  tip 
  of 
  

   clypeus, 
  furrow 
  shallow, 
  outer 
  margin 
  

   slightly 
  concave 
  over 
  cox.e, 
  slightly 
  convex 
  along 
  lora? 
  ; 
  front 
  one-fourth 
  

   longer 
  than 
  broad, 
  nearly 
  twice 
  the 
  length 
  of 
  clypeus, 
  superior 
  angle 
  

   broadly 
  rounded. 
  Face 
  and 
  vertex 
  nearly 
  smooth. 
  Length 
  of 
  vertex 
  

   at 
  middle 
  nearly 
  one 
  and 
  a 
  half 
  that 
  next 
  the 
  eyes. 
  Pronotum 
  slightly 
  

   less 
  than 
  twice 
  as 
  broad 
  as 
  long, 
  posterior 
  two-thirds 
  minutely 
  trans- 
  

   versely 
  rugose, 
  front 
  margin 
  broadly 
  rounded, 
  hind 
  margin 
  concave, 
  

   posterior 
  angles 
  broadly 
  rounded. 
  Scutellum 
  broader 
  than 
  long, 
  trans 
  

   verse 
  groove 
  straight. 
  Color 
  pale 
  bluish 
  or 
  yellowish 
  green; 
  face 
  and 
  

   vertex 
  pale 
  yellow; 
  pronotum 
  pale 
  yellow 
  or 
  bluish 
  green, 
  with 
  front 
  

   and 
  lateral 
  margins 
  yellowish, 
  hind 
  margin 
  sometimes 
  whitish 
  ; 
  disk 
  of 
  

   X)ronotum 
  sometimes 
  with 
  three 
  ftiint 
  longitudinal 
  orange 
  lines; 
  scu- 
  

   tellum 
  yellowish, 
  sometimes 
  j)osterior 
  angles 
  bluish, 
  elytra 
  milky 
  sub- 
  

   hyaline, 
  clavus 
  with 
  two 
  faint 
  longitudinal 
  orange 
  marks, 
  another 
  near 
  

   tip, 
  a 
  faint 
  broken 
  longitudinal 
  orange 
  line 
  on 
  corium, 
  veins 
  whitish 
  

   toward 
  apex; 
  abdomen 
  pale 
  greenish 
  yellow; 
  legs 
  pale 
  yellow 
  at 
  base 
  

   shading 
  into 
  deep 
  blue 
  at 
  tips. 
  

  

  Length 
  2.5 
  mm. 
  Described 
  from 
  tlnce 
  males. 
  

  

  Cotype.—:So. 
  3534, 
  U.S.N.M. 
  

  

  Steamboat 
  Springs, 
  July 
  12, 
  on 
  ArtemLsid 
  iridentata 
  (liaker). 
  

  

  f 
  IGS. 
  80, 
  81, 
  and 
  82.— 
  Vertex 
  and 
  pronotum, 
  

  

  ELYTRON 
  AND 
  WING 
  OF 
  EMPOASCA 
  NIGROS- 
  

   CUTA. 
  

  

  