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By Rajendra Singh

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They moult 3- 12 times to attain adulthood in about a year. Some species reproduce parthenogenetically. Example, Mantis religiosa (praying mantid). The mantids are largely arboreal but some apterous forms are found on ground. , thus, beneficial for us in naturally controlling the population of pest insects. 6. Order-Isoptera (lso- equal, ptera-wing; termites, Fig. 1 6). Soft bodied, social and polymorphic species living in large communities composed of reproductive forms together with numerous apterous, sterile soldiers and workers; head movably articulated, prognathous with compound eyes in winged forms only (reproductive castes, frontal gland exits through fontanelle) ; antennae short and moniliform; mouthparts biting and chewing, mandibles large in soldiers, ligula 4-lobed; prothorax freely movable, narrower than the head, meso- and metathorax wider than fong; fore- and hindwings are similar in size, form and venation, capable of being shed by means of basal fracture (humoral suture), anterior veins more sclerotised, no cross veins; legs short and stout, Economically Important Insect Orders 46 J 16 18 17 19 1 4 to 1 9.

It follows, then, that any species description plus all information gained since the discovery of that species is only a partial picture and that a species description in this sense is never really completed. In reality the vast majority of species descriptions are based on selected morphological features, and although the modern trend is definitely in the direction of including other sorts of data (particularly physiological, biochemical, genetic, and behavioural), morphological characters will likely continue to be central to most descriptions, at least of insects because such characters are visible even in the dead insects.

3. With specimens mounted upside down, it is desirable to have the specimen securely held down. Once the wings are in position, the antennae can be properly oriented and held in place by crossed pins. With a specimen mounted upside down on a flat surface, the final step is removing the pin from the body of the insect, this is done by holding the body down with forceps . and carefully withdrawing the pin. [ IV] Mounting Very small insects are mounted on a card point on a minuten pin, or on a microscope slide, or they may be preserved in liquid.

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