﻿406 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  ae 
  

  

  Abdomen: 
  Tergites 
  uniformly 
  dark 
  brown, 
  sparsely 
  hairy, 
  the 
  apical 
  

   fringes 
  not 
  longer 
  than 
  hairs 
  on 
  other 
  portions 
  except 
  on 
  sixth 
  tergite 
  ; 
  

   genitalia 
  small, 
  aedeagus 
  with 
  a 
  complex 
  group 
  of 
  hornlike 
  appendices; 
  

   lamella 
  single, 
  with 
  short 
  terminal 
  setae. 
  

  

  Holotype 
  (unique) 
  (U. 
  S. 
  N. 
  M. 
  No. 
  57989) 
  : 
  Pilgo 
  River, 
  Guam, 
  

   June 
  1945 
  (G. 
  E. 
  Bohart). 
  

  

  Reraarhs. 
  — 
  This 
  species 
  resembles 
  sctifemur 
  in 
  general 
  appearance 
  

   but 
  has 
  mesopleural 
  vestiture. 
  It 
  runs 
  to 
  arizonensis 
  Malloch 
  or 
  

   monticola 
  'M^illoQh. 
  in 
  his 
  key 
  (1912) 
  but 
  has 
  a 
  longer 
  costa 
  than 
  

   arizonensis 
  and 
  differs 
  from 
  monticola 
  in 
  having 
  the 
  first 
  two 
  divisions 
  

   of 
  the 
  costa 
  subequal 
  instead 
  of 
  2 
  : 
  1. 
  It 
  also 
  differs 
  from 
  monticola 
  

   in 
  having 
  the 
  outer 
  supra-antennals 
  only 
  one-third 
  as 
  far 
  apart 
  as 
  the 
  

   width 
  of 
  the 
  f 
  rons. 
  It 
  runs 
  to 
  galugensis 
  Brues 
  or 
  laluvensis 
  Brues 
  in 
  

   the 
  key 
  to 
  Philippine 
  species 
  (1936) 
  but 
  has 
  narrower 
  wings 
  than 
  

   lalvwensis 
  and 
  the 
  seta 
  on 
  the 
  base 
  of 
  Ri+o, 
  which 
  is 
  missing 
  in 
  the 
  

   latter. 
  It 
  differs 
  from 
  galugensis 
  in 
  its 
  sparse 
  costal 
  bristles 
  and 
  

   darker 
  color. 
  It 
  is 
  apparently 
  similar 
  to 
  hasiseta 
  from 
  Samoa 
  (Mal- 
  

   loch, 
  1935) 
  (hence 
  its 
  name) 
  but 
  has 
  mesopleural 
  vestiture. 
  

  

  MEGASELIA 
  SCALARIS 
  (Loew) 
  

  

  Figures 
  33, 
  34 
  

   Phora 
  scalaris 
  Loew, 
  Berlin 
  Ent. 
  Zeitschr. 
  (Centuria 
  VII), 
  vol. 
  10, 
  y. 
  53, 
  1866. 
  

  

  Length 
  1.6 
  to 
  3 
  mm. 
  ; 
  length 
  of 
  wing 
  of 
  a 
  3-mm. 
  specimen 
  2.8 
  mm., 
  

   body 
  yellowish 
  (frons 
  of 
  male 
  sometimes 
  largely 
  black) 
  with 
  indistinct 
  

   brownish 
  markings 
  on 
  the 
  scutum, 
  forming 
  a 
  pair 
  of 
  dorsal 
  longi- 
  

   tudinal 
  stripes, 
  another 
  pair 
  of 
  more 
  lateral 
  and 
  posterior 
  stripes, 
  and 
  

   several 
  angular 
  spots 
  anterior 
  to 
  these 
  ; 
  abdomen 
  marked 
  as 
  illustrated 
  

   but 
  sometimes 
  more 
  extensively 
  dark 
  so 
  tliat 
  the 
  yellow 
  is 
  constricted 
  

   to 
  basal 
  and 
  apical 
  bands 
  on 
  the 
  second 
  and 
  third 
  tergites 
  and 
  basal 
  

   central 
  spots 
  on 
  the 
  fourth 
  and 
  fifth 
  tergites. 
  The 
  first 
  tergite 
  and 
  

   the 
  apical 
  lobes 
  of 
  the 
  last 
  always 
  remain 
  largely 
  yellow; 
  palpi, 
  

   halteres, 
  pleura, 
  and 
  legs 
  (except 
  for 
  apices 
  of 
  hind 
  femora) 
  creamy 
  

   yellow. 
  Head: 
  Frontal 
  bristles 
  long 
  and 
  moderately 
  heavy, 
  the 
  

   supra-antennals 
  about 
  equidistant 
  and 
  the 
  outer 
  ones 
  only 
  a 
  little 
  

   stronger 
  than 
  the 
  inner; 
  antiales 
  a 
  little 
  higher 
  than 
  the 
  outer 
  supra- 
  

   antennals 
  and 
  much 
  lower 
  than 
  but 
  nearly 
  as 
  far 
  apart 
  as 
  lower 
  

   f 
  rentals; 
  proboscis 
  of 
  females 
  short 
  and 
  fleshy. 
  Thorax: 
  Propleura 
  

   with 
  numerous 
  scattered 
  hairs 
  in 
  addition 
  to 
  a 
  dorsal 
  posterior 
  fringe 
  

   and 
  two 
  to 
  four 
  ventral 
  bristles; 
  pleura 
  otherwise 
  bare; 
  posterior 
  

   margin 
  of 
  scutum 
  with 
  single 
  pair 
  of 
  long 
  slender 
  bristles 
  and 
  scutel- 
  

   lum 
  with 
  two 
  pairs 
  of 
  subequal 
  bristles 
  ; 
  scutal 
  pubescence 
  dense 
  and 
  

   composed 
  of 
  very 
  small 
  hairs 
  ; 
  halteres 
  yellow, 
  sometimes 
  with 
  darker 
  

   apical 
  spot. 
  Wings: 
  Costa 
  distinctly 
  longer 
  than 
  succeeding 
  length 
  

   of 
  wing; 
  veins 
  bare 
  except 
  for 
  moderately 
  short 
  and 
  dense 
  costal 
  

   fringe 
  and 
  the 
  usual 
  bristles 
  on 
  the 
  basal 
  posterior 
  margin 
  ; 
  costa 
  from 
  

  

  