THE
COCKROACH - also called Roach, any insect of the suborder Blattaria -
Order of Dictyoptera. There are more than 3,500 species. An order of
insects comprising the cockroaches - suborder Blattaria) and the
mantids - suborder Mantodea, occurring mainly in tropical regions.
Cockroaches are oval and flattened in shape; some have a single
well-developed pair of wings, folded back over the abdomen at rest,
while in others the wings may be reduced or absent. They are usually
found in forest litter, feeding on dead organic matter, but some
species, e.g. the American cockroach - Periplaneta Americana, are
major household pests, scavenging on starchy foods, fruits, etc. In
most species the females produce capsules - the oothecae, containing
16 - 40 eggs. These are either deposited or carried by the female
during incubation.
The word cockroach is a corruption of the Spanish cucaracha. Cockroaches
are among the most primitive living, winged insects, almost unchanged for more than
450 million years, and are among the oldest fossil insects. The cockroach is characterized by a flattened, oval body; long, threadlike antennae; and a shining, black,
mahogany or brown, leathery integument. The head is bent downward, and the mouthparts point backward instead of forward or downward as is the case in most other insects. The male usually has two pairs of wings; the female, often wingless or with vestigial wings, carries eggs in egg cases,
called the ootheca, that protrude from her body. After the female deposits an egg case, soft white nymphs emerge, hardening and turning brown in
color upon exposure to air.
The structure and large size
- certain species have a wingspan of more than 12 cm, that is nearly 5
inches. There size and the stigma they invoke, has made them objects of interest in the biological laboratory.
The cockroach prefers a warm, humid, dark environment and is usually found in tropical or other mild climates. Only a few species have become pests. The insect damages more material than it consumes and emits a disagreeable
odor. The diet of the roach, which includes both plant and animal products, ranges from food, paper, clothing, and books to dead insects, especially bedbugs.
The American
Cockroach - species Peripla ne ta americana, is 30 to 50 mm long, this
is up to about 2 inches, reddish brown, and lives outdoors or in dark, heated indoor areas.
It likes warm basements and furnace rooms. An adult live for about 18
months and during this time, the female deposits 50 or more oothecae, each containing about 16 eggs that hatch after 45 days. Nymphal life lasts from 11 to 14 months. The American cockroach, a native of tropical and subtropical America, has well-developed wings and can fly long distances.
The German
Cockroach - species Blattella germanica, is a common household pest sometimes
mistakenly called a water-bug. It is light-brown with two dark stripes on the prothoracic region. The female produces the ootheca three days after mating and carries it for about 20 days. Because it is small,
about 12mm, less than half an inch long), this cockroach often is carried into homes in grocery bags and
boxes. It has spread throughout the world by ship. Three or more generations may occur
every year. This cockroach is abundant around the water pipes of the Croton Aqueduct in New York City,
and has became known as the Croton bug, which might be a sub-species.
The Brown-banded
Cockroach, species - Supella supellectilium, resembles the German cockroach but is slightly smaller. The male has fully developed wings and is lighter in
color than the female, whose wings are short and nonfunctional. Both sexes have two light-colored bands across the back. The adult life span
here, is about 200 days, and there may be two generations annually. Eggs may be deposited in clothes, wood molding, or cracks in the floor. With the advent of heated buildings this cockroach became established in cooler climates.
The Oriental
Cockroach, species Blatta Orientalis, is considered one of the filthiest of household pests. It is oval, shiny black or dark brown, 25 to 30 mm long, with a life cycle similar to that of the American cockroach. The male has short, fully developed wings, and the female has vestigial wings. This cockroach has been distributed by vehicles of commerce from its Asiatic origins to all the temperate regions.