HUNGERFORD: AQUATIC HEMIPTERA. 49 
abdomen more or less black. First pair of legs entirely black; second and 
third more or less spotted with lighter color. 
“Dimensions: Insect—Long., 7.4 mm; lat., 5.8 mm. Head including 
eyes—Long., .6 mm; lat., 3.4 mm. Prothorax—-Long., 2.4 mm; lat., 5 mm. 
Abdomen—Long., 4. 4 mm; lat., 5.8 mm. 
“Redescribed from a single specimen in the collection of Mrs. Annie 
Trumbull Slosson, who took it in Florida. 
“The much roughened upper surface together with the entirely coriace- 
ous hemelytra fused into one will at once distinguish this species from all 
the other Mononychine. 
“The preceding descriptions will doubtless be found lacking in many 
respects, but dissection being necessary to determine certain anatomical 
features and characters, such, for instance, as the antennae, the posses- 
sion of only one specimen, and that not my own, has made it impossible to 
supply what is missing.”—Bueno. He adds: 
“As Say’s description is not accessible to all, I give it hereafter taking 
it from the Le Conte edition”: 
“N. stygica.—Black, front quadrilineate. 
“Tnhabits Georgia. 
“Body oval, brown-black, rather rough; head crenate on the front so 
as to form four denticulations; eyes rounded, rather prominent; thorax 
not emarginate before, with a slightly depressed margin behind; anterior 
thighs dilated triangular; hemelytra with oblique lines; they appear 
united at the suture. 
“Length three-tenths of an inch. 
“T have but one mutilated specimen which was sent to me by Mr. 
Oemler. If I am not deceived by this specimen, the species is apterous 
and the hemelytra are united by a rectilinear suture, which will require 
the formation of a separate genus which may be named Nerthra.”’ 
This rare insect has been taken in Florida and Georgia. 
B. BIOLOGY OF THE GELASTOCORIDA. 
General Notes. These strange bugs are to be found about the moist 
grounds bordering streams or other water bodies. Some of them dig 
burrows into the sand or mud. They feed upon other insects, pouncing 
upon them with a sudden jump. Their general shape and coloring ren- 
der them difficult to discern in their native haunts. 
Genus GELASTOCORIS Kirk. 
Biology of G@. oculatus. 
Habitat. Uhler has told us how the color varieties harmonize with the 
bug’s surroundings. (See description above.) We have found those on 
mud flats slate color, and those on the river sands mottled and pebbled 
like their dwelling place. It is found amongst the “stones and low banks 
of brooks and streams” or upon the barren sands of the river flats. These 
bugs are gregarious and peculiarly local in distribution. A colony may 
be found in one spot along a given stretch of the stream and nowhere else. 
Hibernation. Bueno took these bugs in their second instar at Long 
Island in late September.* He found no adults, from which he inferred 
that they hibernate as nymphs.+ 
Mating. The writer is not aware of any observation on this point. 
The sexual differences due to the asymmetry of the male was noted as 
* Three Days in the Pines of Yaphank., Can. Ent., July, 1912. 
j Our Kansas forms winter as adults, burying themselves in the sand. 
4—Sci. Bul.—1669. 
