HUNGERFORD: AQUATIC HEMIPTERA. 119 
Hibernation. “As ova and no adults could be found in early spring, 
the winter is probably spent as an egg.” 
Mating. Found mating in October. ‘Many of the pairs remained 
almost constantly ‘in coitu’ for several days.” 
Number of Instars. Five (?). Takes about 50 days from hatching to 
adult. 
Food Habits. Eat small insects that fall into the water. Do not dis- 
dain food that has been dead some time. 
DESCRIPTION OF STAGES. 
The Egg. 
Three times as long as wide; dirty greenish yellow in color. 
Genus METROBATES. 
Metrobates hesperius. 
Habitat. This bug is lacustrine. Bueno says it “may be seen con- 
gregated in large patches of blackness on the smooth waters of our 
lakes or perhaps in the wide reaches of slow moving streams. Little 
else is known about this insect. 
Genus TREPOBATES. 
Trepobates pictus. 
Habitat. This is a beautiful species, as its name would indicate. It 
is wide spread, and quite usually apterous. Here in Kansas, however, 
it frequents our ponds and is quite largely winged as taken in the spring. 
Hibernation. From the collecting it would be assumed it winters as 
an adult. 
Oviposition. The writer shows some figures of the egg masses of 
this species. They are laid in solid masses of gelatinous material on the 
under side of leaves and sticks in the water. The writer has found 
them under the leaves of Duckmeat and grass blades. The eggs are 
- placed side by side and imbedded in a pad or matrix of yellowish white 
gelatin. There are from 3 to 10 eggs in a mass. (See plate XII.) 
Incubation. From eggs laid in the laboratory June 19, young nymphs 
- appeared June 24, a period of 5 days. 
Hatching. Before hatching the eggs became beautifully marked with 
red spots, the large eye spots and sixteen other small dots, distributed as 
shown in the drawing on plate XV. These spots are located in various 
places on the nymphs, such as antenne and joints of the limbs. The 
postnatal molt bears a black shiny “egg burster’ like the Gerris. After 
hatching the nymphs swim about in the water by means of middle legs. 
They stand several hours of submergence at this time. 
Food Habits. Source of food much as for their larger relatives. 
DESCRIPTION OF STAGES. 
The Egg. 
Size. .99 mm. long; .3812 mm. wide. 
Shape. Elongate oval; anterior end more pointed. 
Color. White, turning to amber; marked with red spots before hatch- 
ing. (See pl. XV, fig. 13.) 
