INSECTS AND VERMES. 345 
BlattcB molendinarice of all sizes, from the most minute 
growth to their full proportions. They seem to live in 
a friendly manner together, and not to prey the one on the 
other. 
August, 1792. After the destruction of many thousands 
of Blattce molendinarice, we find that at intervals a fresh de- 
tachment of old ones arrives ; and particularly during this 
hot season : for the windows being left open in the evenings, 
the males come flying in at the casements from the neigh- 
bouring houses, which swarm with them. How the females, 
that seem to have no perfect wings that they can use, can 
contrive to get from house to house, does not so readily 
appear. These, like many insects, when they find their 
present abodes overstocked, have powers of migrating to 
fresh quarters. Since the Blattce have been so much kept 
under, the crickets have greatly increased in number. 
GRYLLUS DOMESTICUS — HOUSE CRICKET. 
November. After the servants are gone to bed, the kitchen 
hearth swarms with minute crickets not so large as fleas, 
which must have been lately hatched. So that these 
domestic insects, cherished by the influence of a constant 
large fire, regard not the season of their year, but produce 
their young at a time when their congeners are either dead, 
or laid up for the winter, to pass away the uncomfortable 
months in the profoundest slumbers, and a state of torpidity. 
When house crickets are out, and running about in a room 
in the night, if surprised by a candle, they give two or three 
shrill notes, as it were for a signal to their fellows, that they 
may escape to their crannies and lurking holes, to avoid 
danger. 
CIMEX LINEARIS. 
August 12, 1775. Cimices lineares^ are now eagerly pair- 
ing on ponds and pools. The females, who vastly exceed 
the males in bulk, dart and shoot along on the surface of 
the water with the males on their backs. When a female 
chooses to be disengaged, she rears, and jumps, and plunges, 
lianali^a linearis, Fabb. 
