INVERTEBRATE ANIMALS. 99 



Note the form of the fore -legs, constructed for 

 burrowing, in the Mole-cricket, Gryllotalpa 

 vulgaris. 

 Cockroaches, Blattidce. The British species are 

 of small size : the common Cockroach which 

 infests houses, Blatta Orientalis, is supposed 

 to have been introduced from the Levant. 

 The order Euplexoptera = Earwigs, ForJicuUdce, 

 derives its name from the wondrous manner in which 

 the ample wings are folded and hidden under the tiny 

 wing-sheaths of the insect. 



The order Strepsiptera = Stylops, parasitic on 

 Bees, closely allied to the Beetles, would be here illus- 

 trated, but the insect is yet a desideratum. 



Order COLEOPTERA. koXso^, a sheath ; ttts^ov, a wing. 

 The number of species in this order, as estimated by 

 Mr. Bentham in 1871 is 90,000. Works of especial 

 service in naming and arranging the series were, Lacor- 

 DAiRE, Genera des Coleopteres, 9 vols., Paris, 1859 ; 

 Olivier, Entomologie, 6 vols. 4to. ; Gory et Perche- 

 RON, Monographic des Cetoines. 

 Most of the groups include a small series of selected British species 

 presented by B. Cooke, or collected iti the neighbourhood of Liver- 

 pool by H. LoNGTJET HiGGINS. 



Group 230.— Divisions EUPODA, PSEUDOTRIMERA, 

 HETEROMERA. 



Examples of Tortoise-beetles, Cassididce ; Turnip- 

 fly, Phyllotreta ; Lady-birds, Coccinellidce ; 

 Meal-worm-beetle, Tenehrio ; Cellar-beetle, 

 Blaps; Oil-beetle, Melo'e , Blister-beetle, Lytta, 

 &c. ; also of the division Brachelytra. 

 Estimated number of British species, more than 1,000. 



