. GRYLLOTALPA. 199 



5. Tibise posticse, spinis validis armatte, inter spinas haud serratse. — Gryllin^:.— 

 (Gen. Acanthoplistus.) 

 5, 5. Tibiae posticse graciles, spinis gracilibus armatse, inter spinasqne serrulatse. — 



(EcANTHINjE. 



1, 1. Tarsorum secundus articulus depressus, cordiformis. 

 2. Tibiae posticse haud serratse, biseriatim spinosae. 



3. Spinis utrinque 3 mobilibus ; calcaribus apicalibus in latere interno tantum 2. Ovi- 

 positor brevis, incurvus. — Trigonidin^. 

 3, 3. Spinis numerosis infixis. Ovipositor elongatus, rectus. — Gen. Stenogryllus. 

 2, 2. Tibise posticse utrinque serratae ac spinosse ; calcaribus apicalibus ut solitum utrinque 3. 

 Ovipositor rectus vel incurvus. — Eneopterin^e. 



Tribus GRYLLOTALPIN.E. 

 Gryllotalpiens , Saussure, Miss. Scient. Mex., Orthopt. p. 333 ; Melang. Orthopt. ii. fasc. 5, p. 186. 

 The Gryllotalpinae are of subterranean habits and are partial to water *. The species 

 of the first group (Gryllotalpites, Sss.) are furnished with a clothing of velvety hairs, 

 which protects them while burrowing. They swim admirably well, their anterior feet 

 being as well adapted for swimming as for digging. The species of the group Tridac- 

 tilites are entirely aquatic. They live on the sandy shores of rivers, digging galleries 

 in the sand and running, or rather skating, on the surface of the liquid element. 

 When submerged by waves or the whirl of the current, they swim admirably with 

 their hind tibiae, which are sometimes furnished with articulated paddles, acting like 

 oars ; or they dart through the water — their very strong hind legs enabling them to 

 take enormous leaps — till they reach the surface again. 



GRYLLOTALPA, Latr. et auctt. 



Gryllotalpa, Latreille et auctt. (1807). 



Curtilla, Oken, Lehrbuch, iii. 1, p. 445 f (1815) . 



1. Gryllotalpa hexadactyla, Perty. 



Gryllotalpa hexadactyla, Perty, Del. Anim. Artie. Bras. p. 119, t. 23. fig. 9 (1830) ; Sauss. Miss. 



Scient. Mex., Orthopt. p. 344. 5, fig. 22; et auctt. 

 Gryllotalpa longipennis, Scudd. Bost. Journ. Nat. Hist. vii. p. 426. 2 (1863). 

 Gryllotalpa azteca, Sauss. Rev. et Mag. de Zool. 1859, p. 316 ; Miss. Scient. Mex., Orthopt. p. 345. 



* To obtain specimens of the European Oryllotalpce it is only necessary to throw water on the paths between 

 the flower-beds of gardens and to cover the wetted places with pieces of board ; in the morning some of these 

 insects are almost sure to be found under the boards disporting themselves in the mud. 



f This name is older than Gryllotalpa, having been employed by authors anterior to Linnaeus. It is 

 derived from curtis, garden, curtilla, gardener. The French word courtilihre is derived from this. 



