• Oriental Cockroach (Blatta Orientalis)
Adults, 20-24mm long; color, dark-brown, nearly black; wings of male cover two-thirds of abdomen, wings of female are vestigial; can climb rough but not smooth vertical surfaces.
They are the most common species and frequently encountered in cooler, less humid areas such as basements and drains.
• German Cockroach (Blattella Germanica)
Adult, 10-15mm long; color, yellowish-brown with two longitudinal dark marks on pronotum; wings well developed in both sexes; can readily climb rough and polished vertical surfaces.
They are the most common species and generally prefers warmer, humid environments, e.g. centrally heated buildings.
• American Cockroach (Periplaneta Americana)
Adult, 28-44mm long; color, red-brown with yellow border around pronotum; no yellow submarginal stripes on forewings; last segment of cerci, twice as long as wide.
They are tropical and sub-tropical species but are also found in ports and shipping areas in temperate climates.
The nymphs of all species are similar in appearance to the adult but smaller. Immediately after hatching or moulting the nymphs are white, but the cuticle soon darkens to the normal color.
• Oriental cockroach: adult size: 25 to 30 mm long. Each egg case contains 16 young; the egg will be developed into nymph in 6 to 12 weeks and then to adult in 10 m