_Paragryllacris combusta_ lives in hiding during the day under a curled leaf spathe of a palm frond, or in a cavity in a tree trunk; if in the last it often forms a white tough substance of a net-like structure over the front, and if disturbed will snap at a grass blade or straw and shake the net, making a distinct sharp sound. It is of a uniform, yellowish brown tint, measuring about 2 inches to the tip of the large curled wings closely folded over the body. The curious Cave Locust, _Pachyrhamma sp._, with its small oval body, and long slender antennae and hind legs, is always found in caves. It is a dull brown wingless creature, whose slender thread-like antennae are many times longer than the body. Family 10. Crickets. GRYLLIDAE. These are the black field and house crickets which are so well known by their shrill note; this is caused by the insect rubbing the stout wing covers or elytra together; those of the males have a distinct circular wavy neuration forming distinct ridges for this purpose. Crickets are easily distinguished by their slender thread-like antennae, short rounded heads, black wings folded down the back, and spiny hind legs adapted both for creeping through the grass or jumping out of the road of their enemies. The abdomen is furnished with a pair of slender spined appendages on the sides, and the female with a stiletto-like ovipositor composed of two grooved pieces by which the eggs are deposited in the ground. We have a number of field crickets in this country; Walker in his catalogue of the family gives 12 species, of which _Gryllus servillei_ is our common field cricket, sometimes swarming out in sufficient numbers to do a great deal of damage to field crops and vegetable gardens. It is of a uniform black tint, with a short, shining, round head; it measures about 1 inch in length, and has a wide range over Australia. The Mole Cricket, _Gryllotalpa coarctata_, is found all over the interior, forming underground tunnels in the sand along the edges of watercourses; it was collected in the Horn Expedition in Central Australia, and is also found about Sydney. It is of the usual dull brown tint, with hooded thorax and spade-shaped fore-legs. Another curious little black cricket is common about the edges of watercourses, and when disturbed often jumps in and swims about on the surface; it belongs to the Genus _Nemobius_, and is only ⅙ of an inch in length. [Illustration: Plate VII.--ORTHOPTERA. Family GRYLLIDAE. 1. _Gryllus servillei_ (Sauss.). 1_a_. _Gryllus servillei_ (Sauss.). (Elytron ♀.) 2. _Gryllotalpa coarctata_ (Walk.). 3. _Pachyrhamma sp._ 4. _Nemobius sp._ 5. _Paragryllacris combusta_ (Germ.). 6. _Anostostoma erinaceus_ (Gray).] [Illustration: _Plate VII.--ORTHOPTERA._] Order III.--NEUROPTERA. Lace-winged Insects.