﻿AQUATIC 
  INSECTS 
  IN 
  THE 
  ADIRONDACKS 
  587 
  

  

  Family 
  77 
  alysiidae 
  

  

  BRACHYSTROPHA 
  ForStCr 
  

  

  Brachystropha 
  quadriceps 
  sp. 
  nov. 
  

  

  ^ 
  Length 
  1.8 
  mm. 
  Polished 
  black 
  ; 
  mandibles 
  rufous, 
  palpi 
  white; 
  

   antennae 
  black, 
  23 
  jointed, 
  the 
  scape 
  beneath 
  reddish, 
  the 
  extreme 
  apex 
  

   of 
  the 
  pedicel 
  yellowish 
  white 
  ; 
  legs 
  flavo-testaceous, 
  the 
  tibiae 
  and 
  tarsi 
  

   darker, 
  more 
  of 
  a 
  reddish 
  color, 
  the 
  tarsi 
  fuscous. 
  Wings 
  hyaline, 
  iri- 
  

   descent, 
  the 
  stigma 
  and 
  veins 
  dark 
  brown, 
  the 
  stigma 
  subtriangular 
  in 
  

   shape, 
  wider 
  than 
  the 
  first 
  abscissa 
  of 
  the 
  radius 
  and 
  scarcely 
  extending 
  

   to 
  half 
  the 
  length 
  of 
  the 
  marginal 
  cell. 
  

  

  The 
  head 
  is 
  quadrate, 
  with 
  the 
  temples 
  broad, 
  full, 
  the 
  face 
  below 
  the 
  

   antennae 
  smooth, 
  impunctate, 
  but 
  with 
  a 
  delicate 
  median 
  ridge. 
  The 
  

   median 
  fovea 
  on 
  the 
  mesonotum 
  posteriorly, 
  so 
  conspicuous 
  in 
  many 
  

   forms, 
  is 
  very 
  minute, 
  nearly 
  obsolete. 
  The 
  scutellum 
  is 
  bifoveate 
  at 
  

   base. 
  The 
  metathorax 
  is 
  rugulose, 
  bare, 
  but 
  with 
  a 
  median 
  carina. 
  The 
  

   mesopleural 
  suture 
  is 
  distinct, 
  crenate. 
  The 
  abdomen 
  is 
  clavate, 
  the 
  

   petiole 
  being 
  long 
  and 
  striate 
  with 
  prominent 
  spiracles, 
  the 
  following 
  

   segments 
  all 
  smooth, 
  shining. 
  

  

  Type. 
  Cat. 
  no. 
  5366, 
  U. 
  S. 
  national 
  museum 
  

  

  Habitat. 
  Saranac 
  Inn 
  ; 
  N. 
  Y. 
  One 
  specimen 
  in 
  July 
  by 
  Prof. 
  

  

  James 
  G. 
  Needham. 
  

  

  RHiZARCHA 
  Forstcr 
  

  

  Rhizarcha 
  astigma 
  sp. 
  nov. 
  

  

  $ 
  Length 
  2 
  mm. 
  Polished 
  black; 
  mandibles 
  rufous; 
  palpi 
  white; 
  

   antennae 
  black, 
  24 
  jointed, 
  the 
  scape 
  and 
  pedicel 
  rufo-piceous, 
  the 
  latter 
  

   narrowly 
  yellow 
  at 
  apex; 
  legs 
  rufo-testaceous, 
  the 
  coxae 
  and 
  trochanters 
  

   paler, 
  more 
  or 
  less 
  pale 
  yellowish; 
  wings 
  hyaline, 
  the 
  veins 
  brown. 
  

  

  The 
  face 
  below 
  the 
  antennae 
  is 
  feebly 
  punctate 
  and 
  with 
  a 
  short 
  

   median 
  carina. 
  The 
  mesonotum 
  posteriorly 
  has 
  a 
  median 
  fovea 
  and 
  a 
  

   short 
  grooved 
  line 
  just 
  in 
  front 
  of 
  the 
  scutellum. 
  The 
  scutellum 
  is 
  

   bifoveate 
  at 
  base. 
  The 
  metathorax 
  is 
  rugulose 
  but 
  so 
  densely 
  clothed 
  

   with 
  a 
  pale 
  pubescence 
  as 
  to 
  be 
  obscured 
  and 
  the 
  sculpture 
  overlooked. 
  

   The 
  stigma 
  in 
  the 
  front 
  wings 
  is 
  not 
  developed, 
  being 
  narrow 
  and 
  linear 
  

   as 
  in 
  A 
  s 
  p 
  i 
  1 
  o 
  t 
  a 
  . 
  The 
  mesopleural 
  suture 
  is 
  distinct 
  but 
  smooth, 
  not 
  

   at 
  all 
  crenate. 
  The 
  abdomen 
  is 
  oblong 
  oval, 
  scarcely 
  as 
  long 
  as 
  the 
  

   head 
  and 
  thorax 
  united, 
  the 
  ovipositor 
  not 
  prominent, 
  at 
  the 
  most 
  sub- 
  

   exserted, 
  the 
  first 
  segment 
  longitudinally 
  striate, 
  those 
  beyond 
  smooth 
  

   and 
  shining. 
  

  

  