ORDrR II. IIEMIPTERA. 51 



Genus 41. Blatta. 



Jfca^ inflected : antenna: setaceous: ;w//ji unequal, filiform: elytra and 

 ?67'«o-s flat, and nearly coriaceous: thorax nearly flat, orbicular, and 

 niar<'inated : feet formed for rimning : two horns above the tail m 



most species. (PI. ^-fs- 1^-) 

 Sp. 1. Bl. orknlalis, Black-beetle or Cock-roach. 



This insect was originally a native of South America, but is now very 

 generally spread throughout Europe. It cannot be considered a British 

 insect, thou2;h it frequents kitchens, ovens, and -warm places, and de- 

 vours meal, "bread, and other provisions, shoes, &c. It conceals itself 

 during the day, and comes abroad in the night; it runs quickly, and is 

 very tenacious of life. They are killed by red wafers. 



Genus 42, Gryllus. 



Head inflected, furnished with maxillae and filiform palpi : antenna se- 

 taceous or filiform : xcings four, deflected and convoluted ; the under 

 ones folded : hind legs formed for leaping : two claws on all the feet. 



Sp. 1. Gr.flavipes. {PL 4. fg. 19.) 



Inhabits marshes, but is very local in Britain. 



Genus 43. Cicada. 



Rostrutn inflected : antenna: setaceous : w'mgs four, membranaceous and 



deflected : ,/t'e< formed for leaping. {PI. 5. fig. 1 Sf 2.) 

 Sp. 1. Cic. viridis. Elytra green: head yellow, with black dots. 

 Inhabits aquatic plants in ditches. 



Genus 44. Notonecta. 



Rostrum inflected : antenna shorter than the thorax : 7iuigs four, folded 

 together crosswise ; coriaceous at the base : hinder feet ciliated, 

 formed for swimming. 

 The insects of this and the following genus live in water, feeding 



on aquatic animalcula; the larva and pupa have each six feet; they 



are active, and swim like tlie perfect insect; the former wants wings, 



the latter has the rudiments of them. {PL 5. fig. 3.) 



Sp. 1. 'Not. ininidissima. Grey; the head brown: the elytra truncated. 

 Inhabits ponds. 



Genus 45. Nepa. 



Rostrum inflected : antenna short : rvings four, folded crosswise, the an- 

 terior part of them coriaceous : the tico fore feet cheliform ; the 

 others formed for walking. 



Sp. 1. Nepa ciuereu. Of an ash colour : the thorax unequal: the body 

 oblong, ovate. {PL 5. fig. 4.) 



Inhabits ponds and ditches; is very common in Britain throughout the 

 year. 



