458 CLASS vni. 



Xya ILLIG. (Tridactylus OLIV., LATR.) Anterior feet fossorial. 

 Antennae short, filiform, with ten joints. Ocelli three. Posterior 

 feet elongate, saltatory, terminated by lamellae in place of tarsi. 



Xya ILLIG. Posterior tibiae furnished with lamellae elongate, 

 lanceolate, depressed. 



Sp. Xyafossor BUKM., Tridactylus paradoxus LATE. ; DUMER. Cons. gen. s. I. 

 Ins. PI. 25, fig. 8 ; GUERIN, Iconogr. Ins. PI. 54, fig. 5. Hab. in Africa. 

 Xya variegata ILLIG., BURM., CUVIER, R. Ani. ed. ill., Ins. PI. 81, fig. i. 

 Hab. in south of France and in Spain. LEON DUFOUR is of opinion that 

 it belongs to the Acridii; comp. his Recherclies sur THlst. nat. du Tridac- 

 tyle panache, Ann. des Sc. nat. IQ S^rie, Tom. IX. 1838, pp. 321 334. 



Sub-genus : Rhipipteryx NEWMAN, BRULLE (species of Xya BURM., 

 Rhipidopteryx). Posterior tibiae destitute of lanceolate lamellae. 



Section II. Cursoria. Feet ambulatory alone. Wings and 

 elytra horizontal, incumbent. (Musical organ present in none.) 



Family XLI. Mantides nob. (genus Mantis L.) Tarsi with 

 five joints. Head not covered by thorax. 



Phalanx I. Spectra (Phasmida LEACH. Phasmodea BURM.). 

 Fore-feet similar to the rest, not raptorial, very near the head, 

 remote from the intermediate pair. Antennae mostly setaceous, 

 long, in a few short, filiform. Labrum deeply bifid. Mandibles 

 thick, strong; maxillae hard at the apex, subdenticulate ; galea 

 plane, broad. Labium quadrifid, with lacinias unequal, the external 

 very long, plane, hatchet-shaped. Elytra almost always short, 

 wings large ; sometimes wings and elytra none. 



Phasma LICHTENST., FABR. (Spectrum STOLL). 



These insects are in great part confined to tropical countries; 

 many also are found in New Holland. They live on vegetable food. 

 Some wingless species have the form of dried twigs, and others, 

 which are flat, with membranous and vein shield-covers, have a great 

 resemblance to leaves (the genus Phyllium.) Of some species the 

 males are much smaller than the females; the former have often 

 three simple eyes, which in the last are absent. In this division 

 the largest species of insects are found. 



Comp. A. A. H. LICHTENSTEIN, Dissert, on two nat. genera hitherto con- 

 founded under the name of Mantis ; Trans, of the Linncean Soc. vi. 1802 ; 

 TOUSSAINT VON CHARPENTiER's Bemerlungen zu LICHTENSTEIN'S Alh. 



