806 
ANNUAL REPORT OF NEW-YORK 
SAY’S heteroptkrous hemiptera. 
Hydrometra, Latr. 
H. lineate, Fuscous; hemelytra dull whitish with black 
nervures. 
Inhab. U. S. 
Body fuscous, or brown more or less deep : hemelytra dull 
whitish or dusky, with black nervures: wings opake white, with 
black nervures : ter gum pale, quadrilineate with black ; two of 
the lines on the edge and the interval between the two inner 
lines dull whitish or bright yellow ; the incisures of the segments 
more or less black : beneath and feet obscure yellowish : thorax 
with a more or less obvious pale line. 
Length seven-twentieths of an inch. 
This is very much like the stagnorum, F. but the hemelytra 
are not testaceous, and there is no thoracic impressed line. 
[Male ?] Body blued-black ; thorax with a pale lino; antennae 
and feet dark honey yellow; tergum and venter without lines. 
Yar. a. australis, Head beyond the eyes a little longer and a 
little more dilated at tip; second joint of the antennae a little 
more dilated at tip : abdomen with five lateral whitish points. 
Inhab. New-Orleans. 
Gerris, Latr. 
I. G. remigis, Dark Olivaceous; thorax rounded behind, 
without an elevated line. 
Inhab. U. S. 
Body dark brownish-olivaceous ; thorax transversely rugulose 
without much appearance of a dorsal raised line : a dull ochra- 
ceous and indented lino before; posterior margin regularly and 
obtusely rounded with but a very narrow depressed margin: 
tergum with a black line on the middle, in which is a series of 
obsolete gray lines; lateral margin with a series of grayish 
points or short transverse lines : beneath with a silvery sericeous 
reflection, an impressed line on the anterior part of the pectus 
. behind the anterior feet. 
Length half an inch. 
A great similarity exists between some of the species of this 
genus, and I have ventured to separate this species from tb 
puludum F. which is said to have an elevated lino on the thp 
and another on the pectus and postpectus. 
