Zoology.'] NATURAL HISTORY OF VICTORIA. [Insects. 



giving rise to the theory of representative species. It exemplifies 

 the fact that one country of given temperature and other geo- 

 graphical characteristics may have indigenous animal inhabitants so 

 nearly resembling in size, shape, color, and habits some inhabitants 

 of an inaccessibly distant country of like character (without 

 appearing in the intervening localities \ that, each animal being 

 suited to its surroundings, and those geographical circumstances 

 being alike, one might fancy that the species should also be alike. 

 As they certainly are not the same, the one species seems as if 

 made on the pattern of the other, or to imitate it so nearly as to 

 give rise to the general recognition of the fact involved in the 

 theory of "Representative Species." 



This fine Grasshopper is not very uncommon on gum-trees 

 everywhere in Victoria, the male making a loud shrilling noise in 

 summer. It has not been figured before. 



Explanation of Figures. 



Plate 109 — Fig. I, female, natural size, in flying position. Fig. la, head, magnified two 



diameters, to show broad, smooth face without keels or ocelli. Fig. \b, upper lip, magnified 

 three diameters, to show simple, rounded edge. Fig. lc, mandible, magnified three times, to 

 show strongly-toothed edge. Fig. \d, maxilla, magnified three times, to show bifid point, hood, 

 and palpus. Fig. le, labium, magnified three times, to show quadrifid tips and palpi (these two 

 figures accidentally inverted in lithographing). Fig. \f sternum, twice natural size, showing 

 two conical spines on each segment between bases of legs. Fig. !</, hind leg, twice natural 

 size, showing smooth thigh. Fig. lA, four-jointed tarsus, magnified three diameters, viewed 

 sideways. Fig. la', ditto, viewed from below, showing division of basal joint, magnified three 

 times. Fig. Ik, six-valved ovipositor of female, magnified two diameters, showing valves 

 slightly separated, and the appendages at base. Fig. 1/, portion of anterior tibiae, magnified 

 three diameters, to show elongate drum at base, partly covered over by inflection of surface. 

 Fig. 2, male in flying position, natural size. Fig. 2a, same, in resting position, side view. 

 Fig. lb, right elytron, or tegmen, of male, magnified two diameters, to show neuration, and the 

 large, rounded, clear, talc-like spot of the stridulating organ at base, with the coarse, prominent 

 ridges round it. Fig. 2c, portion of left elytron, similarly magnified, to show the difference of 

 the stridulating organ. Fig. 3, female pupa, natural size, showing the shortness of elytra and 

 wings, characteristic of the immature state. 



Frederick McCoy. 



[40] 



