ORDER IT. HEMIPTERA. 6i 



Genus 41. Blatta. 



Head inflected : antenna setaceous: jsa/pj unequal, filiform: eh/tra and 

 a:;/w°-s flat, and nearly coriaceous: thorax nearly flat, orbicular, and 

 marii-inated : feet formed for running : two horns above the tail in 

 most species. (PL ^-fg- 17-) 

 Sp. 1. Bl. orientalis, 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, though 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 maxilke and filiform palpi : antenna se- 

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

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



Sp. 1. Gr.Jiavipes. {PL 4. Jig. 19.) 



Inhabits marshes, but is very local in Britain. 



Genus 43. Cicada. 



Bostnim inflected : antenna: setaceous : wings four, membranaceous and 



deflected : ,/te^ formed for leaping. {PL 5. fig. 1 Sj- 2.) 

 Sp. 1. Cic. Ti/-idis. Elytra green: head yellow, with black dots. 

 Inhabits aquatic plants in ditches. 



Genus 44. Notonecta. 



Rostrum inflected : antenna shorter than the thorax : wings 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 the perfect insect; the former wants wings, 



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



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



Inhabits ponds. 



Genus 45. Nepa. 



Rostrum inflected : antenna short : wi?igs four, folded crosswise, the an- 

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

 others formed for walking. 



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

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



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

 year. 



